Home / Journals / FHMT / Vol.10, No.1, 2018
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  • Open AccessOpen Access

    ARTICLE

    MHD VISCOUS CASSONFLUID FLOW IN THE PRESENCE OF A TEMPERATURE GRADIENT DEPENDENT HEAT SINK WITH PRESCRIBED HEAT AND MASS FLUX

    S. Palaniammal1 , K. Saritha2,*
    Frontiers in Heat and Mass Transfer, Vol.10, pp. 1-10, 2018, DOI:10.5098/hmt.10.1
    Abstract This paper investigates heat and mass transfer of a MHD Casson fluid over a permeable stretching surface in the presence of a temperature gradient heat sink. The effects of viscous dissipation, thermal radiation and chemical reaction are also taken into the consideration. The relevant similarity transformations are used to reduce the governing equations into a system of nonlinear ordinary differential equations and then solved analytically. The influence of various physical parameters on the velocity, temperature, concentration, skin friction coefficient, Nusselt and Sherwood numbers are investigated. The numerical results of skin friction factor, Nusselt and Sherwood More >

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    ARTICLE

    ANALYTICAL INVESTIGATIONS OF DIFFUSION THERMO EFFECTS ON UNSTEADY FREE CONVECTION FLOW PAST AN ACCELERATED VERTICAL PLATE

    E. Kumaresana , A .G. Vijaya Kumara,*, J. Prakashb
    Frontiers in Heat and Mass Transfer, Vol.10, pp. 1-9, 2018, DOI:10.5098/hmt.10.2
    Abstract The objective of this study is to investigate diffusion-thermo and radiation effects on unsteady free convection chemically reacting fluid flow past an accelerated infinite plate with variable temperature and mass diffusion under the influence of uniform transverse magnetic field when the magnetic lines of force are fixed relative to the fluid or to the plate. . Two important cases, when the magnetic lines of force are being fixed relative to the fluid (K=0) or to the moving plate (K=1) have been considered. A general exact solution of the dimensionless governing partial differential equations is obtained More >

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    ARTICLE

    EFFECTS OF VARIABLE FLUID PROPERTIES ON A DOUBLE DIFFUSIVE MIXED CONVECTION VISCOUS FLUID OVER A SEMI INFINITE VERTICAL SURFACE IN A SPARSELY PACKED MEDIUM

    R. Suresh Babu1,2, B. Rushi Kumar1,*, P.A. Dinesh2
    Frontiers in Heat and Mass Transfer, Vol.10, pp. 1-9, 2018, DOI:10.5098/hmt.10.3
    Abstract This problem deals with the effects of double diffusive, mixed convective flow of an incompressible viscous fluid through a vertical heated plate embedded in a non-Darcy porous medium under the influence of variable fluid properties numerically. The governing equations are modeled for the double diffusive boundary layer flow to understand the behaviour of velocity, temperature and concentration for variable fluid properties namely permeability, porosity, thermal conductivity and solutal diffusivity of the physical modal. Using a suitable similarity transformation, the highly nonlinear coupled PDE's are reduced into a set of coupled ordinary differential equations. By applying More >

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    ARTICLE

    RADIATION AND DUFOUR EFFECTS ON LAMINAR FLOW OF A ROTATING FLUID PAST A POROUS PLATE IN CONDUCTING FIELD

    N. Ananda Reddya,*, P. Chandra Reddya , M.C. Rajua , S.V.K.Varmab
    Frontiers in Heat and Mass Transfer, Vol.10, pp. 1-7, 2018, DOI:10.5098/hmt.10.4
    Abstract A theoretical investigation has been performed to describe the laminar flow of a rotating fluid past a porous plate in conducting field with variable temperature and variable concentration taking into account the chemical reaction, radiation and Dufour effects. The non-dimensional governing equations are solved numerically by using finite difference scheme. The effects of different physical parameters on velocity, temperature and concentration are presented and discussed with the help of graphs. Also the numerical values for local skin friction, Nusselt number and Sherwood number are recorded and analyzed. Increasing values of heat source parameter results in More >

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    ARTICLE

    BUOYANCY RATIO AND HEAT SOURCE EFFECTS ON MHD FLOW OVER AN INCLINED NON-LINEARLY STRETCHING SHEET

    Thirupathi Thummaa,*, M.D. Shamshuddinb
    Frontiers in Heat and Mass Transfer, Vol.10, pp. 1-12, 2018, DOI:10.5098/hmt.10.5
    Abstract This paper numerically investigates the magnetohydrodynamic boundary layer convective flow of an electrically conducting fluid in the presence of buoyancy ratio, heat source, variable magnetic field and radiation over an inclined nonlinear stretching sheet under convective surface boundary conditions. The Rosseland approximation is adopted for thermal radiation effects and the non-uniform magnetic field applied in a transverse direction to the flow. The coupled nonlinear momentum, thermal and species concentration governing boundary layer equations are rendered into a system of third order momentum and second order energy and mass diffusion ordinary differential equations via similarity transformations… More >

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    ARTICLE

    CONVECTIVE HEAT TRANSFER, FRICTION FACTOR AND THERMAL PERFORMANCE IN A ROUND TUBE EQUIPPED WITH THE MODIFIED V-SHAPED BAFFLE

    Amnart Boonloia, Withada Jedsadaratanachaib,*
    Frontiers in Heat and Mass Transfer, Vol.10, pp. 1-19, 2018, DOI:10.5098/hmt.10.6
    Abstract Convective heat transfer, pressure loss and thermal performance in a heat exchanger tube inserted with the modified V-shaped baffle are investigated numerically. The influences of the flow attack angle (α = 20o , 30o and 45o ), baffle height in term of blockage ratio (b/D = BR = 0.05, 0.10, 0.15, 0.20 and 0.25) and arrangement (The V-tip pointing downstream is called “V-Downstream”, while the V-tip pointing upstream is named “V-Upstream”.) on heat transfer and friction loss are presented for the Reynolds number in range 100 – 1200 (laminar region). The numerical study (finite volume… More >

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    ARTICLE

    IMPACT OF CATTANEO-CHRISTOV HEAT FLUX IN THE CASSON FLUID FLOW OVER A STRETCHING SURFACE WITH ALIGNED MAGNETIC FIELD AND HOMOGENEOUS - HETEROGENEOUS CHEMICAL REACTION

    P. Bala Anki Reddya,*, S. Suneethab
    Frontiers in Heat and Mass Transfer, Vol.10, pp. 1-9, 2018, DOI:10.5098/hmt.10.7
    Abstract This work concentrates on the effects of homogeneous-heterogeneous chemical reactions on MHD boundary layer flow of Casson fluid over a stretching surface. Cattaneo-Christov heat flux model is considered instead of classical Fourier’s law to explore the heat transfer phenomena. Appropriate similarity transformations are used to convert the governing partial differential equations into a system of coupled non-linear differential equations. The resulting coupled non-linear differential equations are solved numerically by using the fourth order Runge-Kutta method with shooting technique. The impact of significant parameters on velocity, temperature, concentration, skin friction coefficient and the Nusselt number are More >

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    ARTICLE

    ENTROPY GENERATION DUE TO NATURAL CONVECTION WITH NON -UNIFORM HEATING OF POROUS QUADRANTAL ENCLOSURE-A NUMERICAL STUDY

    Shantanu Dutta* , Arup Kumar Biswas
    Frontiers in Heat and Mass Transfer, Vol.10, pp. 1-12, 2018, DOI:10.5098/hmt.10.8
    Abstract Industrial processes optimization for higher energy efficiency may be effectively carried out based on the thermodynamic approach of entropy generation minimization (EGM). This approach provides the key insights on how the available energy (exergy) is being destroyed during the process and the ways to minimize its destruction. In this study, EGM approach is implemented for the analysis of optimal thermal mixing and temperature uniformity due to natural convection in quadrantal cavity filled with porous medium for the material processing applications or for cooling of electrical equipments. Effect of the permeability of the porous medium and… More >

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    ARTICLE

    DESIGN AND SIMULATION OF PARALLEL MICROHEATER

    Shailendra K. Tiwaria,* , Somashekara Bhata , Krishna K. Mahatob , Bharath B. Manjunathc
    Frontiers in Heat and Mass Transfer, Vol.10, pp. 1-8, 2018, DOI:10.5098/hmt.10.9
    Abstract This paper presents the design and simulation of a thin film microheater. This can have promising applications in bio-medical analysis, explosive detection, gas sensing, and micro-thrusters. An approach is presented to enhance the thermal uniformity of parallel microheater. The modeling of microheater is done using glass as a substrate material. The analysis is carried out with different resistive material for the heater. To study the response of the microheater to the different supply voltage, substrate thickness, and time interval, finite element simulation is carried out with commercial FEM analysis tool- COMSOL Multiphysics 5.2a. The proposed More >

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    ARTICLE

    NUMERICAL SIMULATION OF SLIP INFLUENCE ON ELECTRIC CONDUCTING VISCOELASTIC FLUID PAST AN ISOTHERMAL CYLINDER

    CH. Amanullaa,b,*, N. Nagendrab , M. Suryanarayana Reddyc
    Frontiers in Heat and Mass Transfer, Vol.10, pp. 1-13, 2018, DOI:10.5098/hmt.10.10
    Abstract The present study deals with the computational analysis on an electrically conducting magneto viscoelastic fluid over a circular cylinder. Prescribed partial slip effects are also taken into account. The governing physical problem is tackled numerically by using the highly efficient and reliable Keller box algorithm. Impact of sundry physical parameters on physical quantities of interest are evaluated. The influence of Williamson viscoelastic fluid parameter, magnetic body force parameter, Thermal and velocity (hydrodynamic) slip parameters, stream wise variable and Prandtl number on thermos-fluid characteristics are studied graphically. The model is relevant to the simulation of magnetic More >

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    ARTICLE

    INVESTIGATION OF EFFECTIVE PARAMETERS ON ENTROPY GENERATION IN A SQUARE ELECTRONIC PACKAGE

    Saeed Zaidabadi Nezad, Mohammad Mehdi Keshtkar*
    Frontiers in Heat and Mass Transfer, Vol.10, pp. 1-7, 2018, DOI:10.5098/hmt.10.11
    Abstract This work reports numerical optimization of natural convection in a square enclosure with local heating of the floor and symmetrical cooling of the sides. This analysis was done to optimize heat transfer from two semiconductors in a square electronic package. It became clear that the major part of entropy generation was due to irreversibility of heat transfer and a small amount of it was related to fluid friction. For heaters with equal power ratio, it is very unpleasant to place heaters near the middle plate of the enclosure, since peak temperatures and entropy generation are More >

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    ARTICLE

    THE STUDY ON CALCULATION METHOD OF TEMPERATURE DISTRIBUTION OF TESTED TUBE FOR WAX DEPOSITION EXPERIMENTAL LOOP

    Rongge Xiaoa,* , Wenbo Jina,*, Zhen Tianb , Yuntong Shec , Li Wanga
    Frontiers in Heat and Mass Transfer, Vol.10, pp. 1-7, 2018, DOI:10.5098/hmt.10.12
    Abstract The loop experiment device plays an important role in the study of wax deposition, and the calculation of the temperature distribution of the test section is the key to establish the wax deposition model. In the conditions of the wax deposition was not formed and constant wall temperature of the tube, the energy balance equation is solved by using separation of variables and combining the Kummer equation (S-K method), the distribution law of temperature in the test section is obtained, and the solution results was compared with Svendsen method, the difference between the results obtained… More >

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    ARTICLE

    BIO-MATHEMATICAL ANALYSIS FOR THE STAGNATION POINT FLOW OVER A NON-LINEAR STRETCHING SURFACE WITH THE SECOND ORDER VELOCITY SLIP AND TITANIUM ALLOY NANOPARTICLE

    S.R.R. Reddya , P. Bala Anki Reddya,*
    Frontiers in Heat and Mass Transfer, Vol.10, pp. 1-11, 2018, DOI:10.5098/hmt.10.13
    Abstract The main object of this paper is to steady the Bio-mathematical analysis for the stagnation point flow over a non-linear stretching sheet with the velocity slip and Casson fluid model. Analysis for the both titanium and titanium alloy within the pure blood as taken as the base fluid. The governing non-linear partial differential equations are transformed into ordinary which are solved numerically by utilizing the fourth order RungeKutta method with shooting technique. Graphical results have been presented for dimensionless stream function, velocity profile, shear stress, temperature profile for various physical parameters of interest. It was More >

  • Open AccessOpen Access

    ARTICLE

    HOMOTOPY ANALYSIS FOR MHD HIEMENZ FLOW IN A POROUS MEDIUM WITH THERMAL RADIATION, VELOCITY AND THERMAL SLIPS EFFECTS

    Nasreen Bano∗,† , B. B. Singh, S. R. Sayyed
    Frontiers in Heat and Mass Transfer, Vol.10, pp. 1-9, 2018, DOI:10.5098/hmt.10.14
    Abstract The present study deals with the two dimensional steady laminar forced MHD Hiemenz flow past a flat plate in a porous medium. The effects of thermal radiation and partial slips on the flow field have been investigated under the variable wall temperature condition of the plate. The governing equations have been transformed into a set of coupled non-linear ordinary differential equations (ODEs) by using suitable similarity transformations. These equations have been solved analytically by using homotopy analysis method (HAM). The effects of Prandtl number, suction/blowing parameter, permeability parameter, velocity slip parameter, radiation parameter, magnetic parameter, More >

  • Open AccessOpen Access

    ARTICLE

    COMPUTATION OF UNSTEADY MHD MIXED CONVECTIVE HEAT AND MASS TRANSFER IN DISSIPATIVE REACTIVE MICROPOLAR FLOW CONSIDERING SORET AND DUFOUR EFFECTS

    M.D. Shamshuddina,*, A.J. Chamkhab,c, Thirupathi Thummad, M.C. Rajue
    Frontiers in Heat and Mass Transfer, Vol.10, pp. 1-15, 2018, DOI:10.5098/hmt.10.15
    Abstract In the current paper, a finite element computational solution is conducted for MHD double diffusive flow characterizing dissipative micropolar mixed convective heat and mass transfer adjacent to a vertical porous plate embedded in a saturated porous medium. The micropolar fluid is also chemically reacting, both Soret and Dufour effects and also heat absorption included. The governing partial differential equations for momentum, heat, angular momentum and species conservation are transformed into dimensionless form under the assumption of low Reynolds number with appropriate dimensionless quantities. The emerging boundary value problem is then solved numerically with an efficient… More >

  • Open AccessOpen Access

    ARTICLE

    A TREE-TYPE CYLINDRICAL-SHAPED NANOPOROUS FILTERING MEMBRANE

    Yongbin Zhang*
    Frontiers in Heat and Mass Transfer, Vol.10, pp. 1-5, 2018, DOI:10.5098/hmt.10.16
    Abstract A tree-type cylindrical-shaped nanoporous filtering membrane is proposed. Across the thickness of this membrane are manufactured two kinds of pores i.e. one trunk pore and four uniform branch pores, these two kinds of pores have the same homogeneous surface property and are linked together, and they are uniformly distributed on the membrane surface; The branch pore is for filtration and its radius is on the 1nm or 10nm scales, while the trunk pore is for collecting the flow coming from its four branch pores and it is aimed for reducing the flow resistance and increasing… More >

  • Open AccessOpen Access

    ARTICLE

    HEAT TRANSFER INFERENCES ON THE HERSCHEL BULKLEY FLUID FLOW UNDER PERISTALSIS

    G. C. Sankad* , Asha Patil
    Frontiers in Heat and Mass Transfer, Vol.10, pp. 1-8, 2018, DOI:10.5098/hmt.10.17
    Abstract Heat transfer effect on the flow of Herschel Bulkley fluid moving in a non-uniform channel is analyzed. The peristaltic wall is considered to be coated with a porous lining. The pertinent parameter effects are studied graphically for the analytical solutions of temperature profile, rate of temperature, heat transfer coefficient and mechanical efficiency. The temperature profile, heat transfer coefficient and the rate of temperature decrease with increase in the Darcy number. Thickening of the porous wall coating raises the temperature profile and the rate measure of temperature. Mechanical efficiency is more in a convergent channel than More >

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    ARTICLE

    A XFEM PHASE CHANGE MODEL WITH CONVECTION

    Dave Martina,b,† , Hicham Chaoukia,b, Jean-Loup Roberta , Donald Zieglerc , Mario Fafarda,b
    Frontiers in Heat and Mass Transfer, Vol.10, pp. 1-11, 2018, DOI:10.5098/hmt.10.18
    Abstract A model for two dimensional solidification problems including convection was developed by coupling the Stefan problem with the Stokes problem. The extended finite element method (XFEM) was used to capture the strong discontinuity in velocity and pressure as well as the jump in heat flux at the phase change interface. The melting temperature and no-slip condition were imposed on the interface using a Lagrange multiplier and the penalization method, respectively. The resulting formulations were then coupled using a fixed point iteration algorithm. The model was able to reproduce the benchmark simulations while maintaining a sharp More >

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    ARTICLE

    INDUCED MAGNETIC FIELD INTERACTION IN FREE CONVECTIVE HEAT ANDMASS TRANSFER FLOW OF A CHEMICALLY REACTIVE HEAT GENERATING FLUID WITH THERMO-DIFFUSION AND DIFFUSION-THERMO EFFECTS

    Sanjib Senguptaa,*, Amrit Karmakarb
    Frontiers in Heat and Mass Transfer, Vol.10, pp. 1-12, 2018, DOI:10.5098/hmt.10.19
    Abstract An exact analysis is made to study the magnetohydrodynamics (MHD) free convective flow of an electrically conducting and chemically reacting Newtonian, incompressible, viscous fluid, flowing past an infinite vertical plate with combined heat and mass transfer. An inclined magnetic field of uniform strength is applied to the plate. As the value of the magnetic Reynolds number is of comparable order of magnitude, the effect of induced magnetic field is being considered and on the other hand due to weak voltage difference caused by the very low polarization charges, the influence of electric field is considered… More >

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    ARTICLE

    EFFECT OF ELASTIC DEFORMATION ON NANO-SECOND GRADE FLUID FLOW OVER A STRETCHING SURFACE

    R. Kalaivanana , B. Gangab , N. Vishnu Ganeshc, A.K. Abdul Hakeema,*
    Frontiers in Heat and Mass Transfer, Vol.10, pp. 1-9, 2018, DOI:10.5098/hmt.10.20
    Abstract The main aim of the present article is to investigate the elastic deformation effects on the boundary layer flow of an incompressible second grade twophase nanofluid model over a stretching surface in the presence of suction and partial slip boundary condition. The second grade nanofluid model with elastic deformation effects is investigated for the first time. The combined effects of elastic deformation, Brownian motion and thermophoresis are also analyzed for the first time. To analyses the heat transfer, heat and mass flux boundary conditions are considered. The governing boundary layer nonlinear partial differential equations are More >

  • Open AccessOpen Access

    ARTICLE

    MIXED BIOCONVECTION FLOW OF A NANOFLUID CONTAINING GYROTACTIC MICROORGANISMS PAST A VERTICAL SLENDER CYLINDER

    A.M. Rashada , A.J. Chamkhab , B. Mallikarjunac,*, M.M.M. Abdoua
    Frontiers in Heat and Mass Transfer, Vol.10, pp. 1-8, 2018, DOI:10.5098/hmt.10.21
    Abstract In this paper, the steady mixed bioconvection flow of a nanofluid containing gyrotactic microorganisms past a vertical slender cylinder is studied. The passively controlled nanofluid model is applied to approximate this nano-bioconvection flow problem, which is believed to be physically more realistic than previously commonly used actively controlled nanofluid models. Using a suitable transformation, the nonlinear system of partial differential equations is converted into non-similar equations. These resulting equations are solved numerically using an accurate implicit finitedifference method. The present numerical results are compared with available data and are found in an excellent agreement. The… More >

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    ARTICLE

    MAGNETOHYDRO DYNAMIC FLOW OF BLOOD IN A PERMEABLE INCLINED STRETCHING SURFACE WITH VISCOUS DISSIPATION, NON-UNIFORM HEAT SOURCE/SINK AND CHEMICAL REACTION

    S.R.R. Reddya , P. Bala Anki Reddya,*, S. Suneethab
    Frontiers in Heat and Mass Transfer, Vol.10, pp. 1-10, 2018, DOI:10.5098/hmt.10.22
    Abstract Present work aims to investigate the blood stream in a permeable vessel in the presence of an external magnetic field with heat and mass transfer. The instability in the coupled flow and temperature fields is considered to be produced due to the time-dependent extending velocity and the surface temperature of the vessel. The non-uniform heat source/sink effects on a chemically responded blood stream and heat viscous. This study is of potential value in the clinical healing of cardiovascular disorders accompanied by accelerated circulation. The problem is treated mathematically by reducing it to a system of… More >

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    ARTICLE

    MULTIPLE SLIPS AND CHEMICAL REACTION EFFECTS ON MHD STAGNATION POINT FLOW OF CASSON FLUID OVER A STRETCHING SHEET WITH VISCOUS AND JOULES HEATING

    G. Vinod Kumar, R. V. M. S. S. Kiran Kumar* , S. V. K. Varma
    Frontiers in Heat and Mass Transfer, Vol.10, pp. 1-8, 2018, DOI:10.5098/hmt.10.23
    Abstract The steady boundary layer stagnation flow of a Casson fluid over a stretching sheet with slips boundary conditions in the presence of viscous dissipation, Joule heating and the first order destructive chemical reaction is analyzed. The governing flow problem is based on momentum equation, energy equation, and mass diffusion equation and these are further simplified with the help of similarity transformations. The reduced, resulting highly nonlinear coupled ordinary differential equations are solved using the Matlab bvp4c package. The effects of various parameters on the dimensionless velocity, temperature, and concentration as well as on the skin More >

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    ARTICLE

    DOUBLE-DIFFUSIVE NATURAL CONVECTION OF LOW PRANDTL NUMBER LIQUIDS WITH SORET AND DUFOUR EFFECTS

    Gang Qiua , Mo Yanga,*, Jin Wangb , Yuwen Zhangc
    Frontiers in Heat and Mass Transfer, Vol.10, pp. 1-8, 2018, DOI:10.5098/hmt.10.24
    Abstract An unsteady numerical model for double-diffusive natural convection of low Prandtl number liquids with Soret and Dufour effects inside the horizontal cavity is developed. The thermosolutal model is solved numerically using the SIMPLE algorithm with QUICK scheme. The flow field, temperature and concentration distributions for different buoyancy ratios, Rayleigh numbers and aspect ratios under different Prandtl numbers are studied systematically. The results reveal that the flow structure develops from conduction-dominated to convection as buoyancy ratio increases under different Prandtl numbers. Heat transfer intensity keeps constant and mass transfer intensity grows slowly before a critical point More >

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    ARTICLE

    UNSTEADY MHD FREE CONVECTION JEFFERY FLUID FLOW OF RADIATING AND REACTING PAST A VERTICAL POROUS PLATE IN SLIP-FLOW REGIME WITH HEAT SOURCE

    K. Venkateswara Rajua,*, A. Parandhamaa , M.C. Rajub , K. Ramesh Babua
    Frontiers in Heat and Mass Transfer, Vol.10, pp. 1-8, 2018, DOI:10.5098/hmt.10.25
    Abstract This manuscript presents an analytical investigation on unsteady MHD free convective viscous incompressible flow of electrically conducting Jeffery fluid with heat source, past an infinite vertical porous flat plate in slip flow regime. A uniform magnetic field perpendicular to the plate is applied. The presence of thermal radiation, heat source, radiation absorption and chemical reaction are included. The effects of flow parameters and thermo physical properties on the velocity temperature and concentration fields across the boundary layer are investigated. The forms of the wall Shear stress, Nusselt number and Sherwood number are derived. The results More >

  • Open AccessOpen Access

    ARTICLE

    CONDUCTION, CONVECTION, AND RADIATION IN A CLOSED CAVITY WITH A LOCAL RADIANT HEATER

    Geniy V. Kuznetsov, Alexander E. Nee*
    Frontiers in Heat and Mass Transfer, Vol.10, pp. 1-9, 2018, DOI:10.5098/hmt.10.26
    Abstract This study deals with the numerical investigation of combined heat transfer via conduction, laminar natural convection, and surface radiation in a closed rectangular cavity with a radiant heating source. Unsteady two-dimensional equations of mass, momentum, and energy conservation for complex heat transfer process under study were formulated in terms of the vorticity – stream function – temperature variables and solved by means of the finite difference method on a uniform grid. Developed numerical code was validated against two benchmark problems of convective and convective-radiative heat transfer. When analyzing complex heat transfer regularities, we varied the… More >

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    ARTICLE

    CFD INVESTIGATIONS OF THERMAL AND DYNAMIC BEHAVIORS IN A TUBULAR HEAT EXCHANGER WITH BUTTERFLY BAFFLES

    AlemKarimaa,*, Sahel Djamelb , Nemdili Alic, Ameur Houarid
    Frontiers in Heat and Mass Transfer, Vol.10, pp. 1-7, 2018, DOI:10.5098/hmt.10.27
    Abstract In the present paper, the effects of a new baffle design on the efficiency of a tubular heat exchanger are numerically investigated. It concerns butterfly baffles inserted in a cylindrical tube heat exchanger. We focus on the influence of the shape of baffles, the space between baffles (pitch ratio, PR) and the baffle size (i.e. the blockage ratio, BR) on the heat transfer and flow characteristics. Three geometrical configurations with different PRs are realized (PR = 1, 2 and 4) and five others with different blockage ratios (BR = 0.1, 0.2, 0.3, 0.4 and 0.5). More >

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    ARTICLE

    EFFECT OF THE VARIABILITY OF HEAT AND MASS TRANSFER COEFFICIENTS ON 3D UNSATURATED POROUS MEDIUM DRYING

    Nidhal Ben Khedhera,b,*
    Frontiers in Heat and Mass Transfer, Vol.10, pp. 1-7, 2018, DOI:10.5098/hmt.10.28
    Abstract A Three-dimensional unstructured control volume finite method is developed to simulate unsteady coupled heat and mass transfer phenomena that arise during convective drying of unsaturated porous media. In order to simulate 3D geometries, as application here the drying of clay brick portion, we developed a Fortran code based on 3D unstructured meshes generated by the free mesh generator Gmsh. Several simulation results are presented and depict the effect of the variability of heat and mass transfer coefficients. These simulations prove that only three-dimensional model is able to capture the effect of variability of heat and More >

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    ARTICLE

    SORET AND DUFOUR EFFECTS ON UNSTEADY HYDROMAGNETIC DUSTY FLUID FLOW PAST AN EXPONENTIALLY ACCELERATED PLATE WITH VARIABLE VISCOSITY AND THERMAL CONDUCTIVITY

    Jadav Konch*
    Frontiers in Heat and Mass Transfer, Vol.10, pp. 1-10, 2018, DOI:10.5098/hmt.10.29
    Abstract Soret and Dufour effects on the unsteady flow of a viscous incompressible dusty fluid past an exponentially accelerated vertical plate with viscous dissipation have been considered in the presence of heat source and magnetic field. The viscosity and thermal conductivity of the fluid are assumed to be varying with respect to temperature. Saffman model of dusty fluid is considered for the investigation. The non-linear partial differential equations with prescribed boundary conditions governing the flow are discretized using Crank-Nicolson formula and the resulting finite difference equations are solved by an iterative scheme based on the Gauss-Seidel… More >

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    ARTICLE

    MHD MIXED CONVECTION FLOW OF A NON-NEWTONIAN POWELLERYING FLUID OVER A PERMEABLE EXPONENTIALLY SHRINKING SHEET

    Astick Banerjeea , Aurang Zaibb , Krishnendu Bhattacharyyac,* , S.K. Mahatod
    Frontiers in Heat and Mass Transfer, Vol.10, pp. 1-8, 2018, DOI:10.5098/hmt.10.30
    Abstract The magnetohydrodynamic (MHD) mixed convection heat transfer in a non-Newtonian Powell-Erying fluid flow due to an exponentially shrinking porous sheet is investigated. Both assisting and opposing flows are considered. After use of the suitable transformations, the governing equations become non-similar ODEs. Numerical computations of resulting equations are obtained by very efficient shooting method for several values of involved parameters. The results exhibit that dual non-similar solutions can be found only when some amount of fluid mass is sucked from the flow field through the porous sheet. Many important results on the effect of external magnetic More >

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    ARTICLE

    IMPACT OF THERMAL RADIATION AND CHEMICAL REACTION ON UNSTEADY 2D FLOW OF MAGNETIC-NANOFLUIDS OVER AN ELONGATED PLATE EMBEDDED WITH FERROUS NANOPARTICLES

    S.P. Samrat, C. Sulochana* , G.P. Ashwinkumar
    Frontiers in Heat and Mass Transfer, Vol.10, pp. 1-8, 2018, DOI:10.5098/hmt.10.31
    Abstract This study reports the flow, thermal and concentration attributes of magnetic-nanofluids past an elongated plate with thermal radiation and chemical reaction. The flow considered is two-dimensional and time-dependent. The pressure gradient and ohmic heating terms are neglected in this analysis. The flow governing PDEs are transformed into ODEs using appropriate conversions. Further, the set of ODEs are solved analytically using perturbation technique. The flow quantities such as velocity, thermal and concentration fields are discussed under the influence of various pertinent parameters namely volume fraction of nanoparticle, magnetic field, stretching parameter, Soret number, radiation and chemical More >

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    ARTICLE

    NUMERICAL SOLUTION ON HEAT TRANSFER MAGNETOHYDRODYNAMIC FLOW OF MICROPOLAR CASSON FLUID OVER A HORIZONTAL CIRCULAR CYLINDER WITH THERMAL RADIATION

    Hamzeh T. Alkasasbeh*
    Frontiers in Heat and Mass Transfer, Vol.10, pp. 1-8, 2018, DOI:10.5098/hmt.10.32
    Abstract This paper focuses on the numerical solution for magnetohydrodynamic (MHD) flow of micropolar Casson fluid with thermal radiation over a horizontal circular cylinder. The nonlinear partial differential equations of the boundary layer are first transformed into a non-dimensional form and then solved numerically using an implicit finite difference scheme known as Keller-box method. The The effects of the emerging parameters, namely Casson fluid parameter, magnetic parameter, radiation parameter and micropolar parameter on the local Nusselt number and the local skin friction coefficient, as well as the temperature, velocity and angular velocity profiles are shown graphically More >

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    ARTICLE

    INVESTIGATION ON THE EFFECT OF INJECTION PRESSURES ON THE SPRAY CHARACTERISTICS FOR DIETHYL ETHER AND DIESEL FUEL AT DIFFERENT CHAMBER TEMPERATURES

    Vijayakumar Thulasi, R. Thundil Karuppa Raj*
    Frontiers in Heat and Mass Transfer, Vol.10, pp. 1-9, 2018, DOI:10.5098/hmt.10.33
    Abstract Diethyl ether is one of the potential alternative fuels for the high speed compression ignition engines that can replace the existing neat diesel fuel. It is well known that the combustion characteristic of a compression ignition engine is highly influenced by the fuel spray structure formed during the injection process. In this paper the spray structure formation for the diethyl ether fuel is studied numerically, using the discrete phase model and it is compared with the neat diesel fuel. The spray is investigated in a constant volume chamber maintained at 30 bar pressure. The fuel… More >

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    ARTICLE

    EXPERIMENTAL COOLER BOX PERFORMANCE USING TWO DIFFERENT HEAT REMOVAL UNITS: A HEAT SINK FIN-FAN, AND A DOUBLE FAN HEAT PIPE

    Mirmanto*, I.B. Alit, I.M.A. Sayoga, R. Sutanto, Nurchayati, A. Mulyanto
    Frontiers in Heat and Mass Transfer, Vol.10, pp. 1-7, 2018, DOI:10.5098/hmt.10.34
    Abstract A comparison study of the use of two different heat removal units was conducted to examine the performance of thermoelectric cooler box. The heat removal units employed were a heat sink fin-fan and a double fan heat pipe. Parameters measured as performance indicators are cooling capacity, temperature differences, and COP. In addition, the effect of electrical power on temperature difference and COP was also investigated. The cooler box size is 285 mm x 245 mm x 200 mm and constructed from styrofoam. The results show that there is no difference of the use of a More >

  • Open AccessOpen Access

    ARTICLE

    HEAT EXCHANGES INTENSIFICATION THROUGH A FLAT PLAT SOLAR COLLECTOR BY USING NANOFLUIDS AS WORKING FLUID

    A. Maouassia,b,*, A. Baghidjaa,b, S. Douadc , N. Zeraibic
    Frontiers in Heat and Mass Transfer, Vol.10, pp. 1-7, 2018, DOI:10.5098/hmt.10.35
    Abstract This paper illustrates how practical application of nanofluids as working fluid to enhance solar flat plate collector efficiency. A numerical investigation of laminar convective heat transfer flow throw a solar collector is conducted, by using CuO-water nanofluids. The effectiveness of these nanofluids is compared to conventional working fluid (water), wherein Reynolds number and nanoparticle volume concentration in the ranges of 25– 900 and 0–10 % respectively. The effects of Reynolds number and nanoparticles concentration on the skin-friction and heat transfer coefficients are presented and discussed later in this paper. Results show that the heat transfer More >

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