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  • Open Access

    ARTICLE

    Peristaltic Flow of Dusty Nanofluids in Curved Channels

    Z. Z. Rashed1, Sameh E. Ahmed2,*

    CMC-Computers, Materials & Continua, Vol.66, No.1, pp. 1012-1026, 2021, DOI:10.32604/cmc.2020.012468 - 30 October 2020

    Abstract In this paper, numerical investigations for peristaltic motion of dusty nanofluids in a curved channel are performed. Two systems of partial differential equations are presented for the nanofluid and dusty phases and then the approximations of the long wave length and low Reynolds number are applied. The physical domain is transformed to a rectangular computational model using suitable grid transformations. The resulting systems are solved numerically using shooting method and mathematical forms for the pressure distributions are introduced. The controlling parameters in this study are the thermal buoyancy parameter Gr, the concentration buoyancy parameter Gc, the More >

  • Open Access

    ARTICLE

    ETHYLENE GLYCOL-BASED NANOFLUIDS – ESTIMATION OF STABILITY AND THERMOPHYSICAL PROPERTIES

    S. Ravi Tejaa , Chellapilla V. K. N. S. N. Moorthyb,*, S. Jayakumarc , Ayyagari Kiran Kumard , V. Srinivasc,*

    Frontiers in Heat and Mass Transfer, Vol.15, pp. 1-9, 2020, DOI:10.5098/hmt.15.7

    Abstract This article is a summary of research involving the evaluation of the thermo-physical properties of Mono-ethylene - glycol-based solar thermic fluids oxidized multiwalled carbon nanotubes. Nanofluids were prepared with Mono-ethylene glycol and water as base fluids in 100:0, 90:10 and 80:20 ratios. These base fluids of three categories were dispersed with purified and oxidized multiwalled carbon nanotubes (MWCNTs) in the weight fractions of 0.125, 0.25 and 0.5 percentages. The variation in zeta potential is studied to examine the dispersion stability during 2 months. Thermal conductivity and dynamic viscosity were measured by hot disk method and… More >

  • Open Access

    ARTICLE

    Thermal Analysis of MHD Non-Newtonian Nanofluids over a Porous Media

    Asad Ejaz1, Imran Abbas1, Yasir Nawaz1, Muhammad Shoaib Arif1, Wasfi Shatanawi2,3,4,*, Javeria Nawaz Abbasi5

    CMES-Computer Modeling in Engineering & Sciences, Vol.125, No.3, pp. 1119-1134, 2020, DOI:10.32604/cmes.2020.012091 - 15 December 2020

    Abstract In the present research, Tiwari and Das model are used for the impact of a magnetic field on non-Newtonian nanofluid flow in the presence of injection and suction. The PDEs are converted into ordinary differential equations (ODEs) using the similarity method. The obtained ordinary differential equations are solved numerically using shooting method along with RK-4. Part of the present study uses nanoparticles (NPs) like TiO2 and Al2O3 and sodium carboxymethyl cellulose (CMC/water) is considered as a base fluid (BF). This study is conducted to find the influence of nanoparticles, Prandtl number, and magnetic field on velocity More >

  • Open Access

    ARTICLE

    Impacts of Heat Flux Distribution, Sloping Magnetic Field and Magnetic Nanoparticles on the Natural Convective Flow Contained in a Square Cavity

    Latifa M. Al-Balushi, M. M. Rahman*

    FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.3, pp. 441-463, 2020, DOI:10.32604/fdmp.2020.08551 - 25 May 2020

    Abstract In the present paper, the effect of the heat flux distribution on the natural convective flow inside a square cavity in the presence of a sloping magnetic field and magnetic nanoparticles is explored numerically. The nondimensional governing equations are solved in the framework of a finite element method implemented using the Galerkin approach. The role played by numerous model parameters in influencing the emerging thermal and concentration fields is examined; among them are: the location of the heat source and its lengthH*, the magnitude of the thermal Rayleigh number, the nanoparticles shape and volume fraction, and… More >

  • Open Access

    ARTICLE

    Experimental Study on Flow and Heat Transfer Characteristics of Nanofluids in a Triangular Tube at Different Rotation Angles

    Cong Qi1,2,*, Chengchao Wang1,2, Jinghua Tang1,2, Dongtai Han2

    Energy Engineering, Vol.117, No.2, pp. 63-78, 2020, DOI:10.32604/EE.2020.010433 - 23 April 2020

    Abstract Because of the poor thermal performance of ordinary tubes, a triangular tube was used to replace the smooth channel in the heat transfer system, and nanofluids were used to take the place of ordinary fluids as the heat transfer medium. High stability nanofluids were prepared, and an experimental set on flow and heat exchange was established. Effects of triangular tube rotation angles (α = 0°, 30°, 60°) as well as mass fractions of nanofluids (ω = 0.1%, 0.3%, 0.5%) on heat exchange and flow performance were experimentally considered at Reynolds numbers (Re = 800–8000). It… More >

  • Open Access

    ARTICLE

    DEVELOPMENT OF A HEAT PIPE AND GREY BASED TAGUCHI METHOD FOR MULTI-OUTPUT OPTIMIZATION TO IMPROVE THERMAL PERFORMANCE USING HYBRID NANOFLUIDS

    Mohammed Yunus*, Mohammad S. Alsoufi

    Frontiers in Heat and Mass Transfer, Vol.12, pp. 1-8, 2019, DOI:10.5098/hmt.12.11

    Abstract Swift cooling systems, improved microprocessor chips, processors’ performance and power usage have increased production of an enormous amount of heat and high operating temperatures due to excess heat flux density in the field of microelectronics. A rapid cooling of electronic circuits and heat dissipation for the same size of pipe with the present technology as nano size circuits critically generate high heat flux beyond 100 W/cm2 is currently the challenging task with which we are presented. Cooling in the form of heat transfer should be managed using both thermal conductivity (evaporation) and phase transition (condensation)… More >

  • Open Access

    ARTICLE

    NUMERICAL INVESTIGATION AND ANALYSIS OF HEAT TRANSFER ENHANCEMENT IN A MICROCHANNEL USING NANOFLUIDS BY THE LATTICE BOLTZMANN METHOD

    Rahouadja Zarita*, Madjid Hachemi

    Frontiers in Heat and Mass Transfer, Vol.12, pp. 1-12, 2019, DOI:10.5098/hmt.12.5

    Abstract In this work, heat transfer enhancement in a microchannel using water-Ag nanofluid has been investigated numerically by the lattice Boltzmann method (LBM) by adopting the stream and collide algorithm, with the (BGK) approximation. The base fluid and the suspended nanoparticles are considered as a homogeneous mixture. And single phase model with first order slip and jump boundary conditions has been adopted. Thermophysical properties of water-Ag nanofluid are estimated by the theoretical models. Effects of change in nanoparticle volume fractions, Reynolds number and Knudsen number are considered. It was concluded that change in nanoparticle volume fractions More >

  • Open Access

    ARTICLE

    NATURAL CONVECTION OF NANOFLUIDS PAST AN ACCELERATED VERTICAL PLATE WITH VARIABLE WALL TEMPERATURE BY PRESENCE OF THE RADIATION

    H. Astutia, P. Srib, S. Kaprawia,†

    Frontiers in Heat and Mass Transfer, Vol.13, pp. 1-8, 2019, DOI:10.5098/hmt.13.3

    Abstract The natural convection of the nanofluids from a vertical accelerated plate in the presence of the radiation flux and magnetic field is observed in this study. Initially, the plate with a temperature higher than the temperature of nanofluids is at rest and then it accelerates moving upward and then the wall temperature decreases. The governing unsteady equations are solved by the explicit method based on the forward finite difference. Three different types of water-based nanofluids containing copper Cu, aluminum oxide Al2O3 and titanium dioxide TiO2 are taken into consideration. The hydrodynamic and thermal performance of the More >

  • Open Access

    ABSTRACT

    Analysis on the Thermal Performance of Nanofluids As Working Fluid With Porous Heat Sinks: Applications in Electronics Cooling

    Ziad Saghir, Cayley Delisle, Christopher Welsford*

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.1, pp. 19-19, 2019, DOI:10.32604/icces.2019.05145

    Abstract The enhancement of consumer and industrial electronics has led to an increase in both the power and compactness of the products available. However, with these increases follows a subsequent increase in the thermal losses experienced across, for example, a central processing unit (CPU). As well, the need to dissipate waste thermal energy is compounded by the increased compactness. As the chipsets become smaller, the threads contained therein also reduce in size and as such become more sensitive to temperature gradients which can cause deformation. Although this deformation is miniscule, its continuous repetition can ultimately result… More >

  • Open 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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