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  • Open Access

    ARTICLE

    Numerical Investigation of the Effect of Sorption Time on Coal Permeability and Gas Pressure

    Yi Xue1,2,*, Faning Dang2, Rongjian Li2, Fei Liu3

    CMES-Computer Modeling in Engineering & Sciences, Vol.115, No.3, pp. 345-358, 2018, DOI: 10.3970/cmes.2018.08052

    Abstract Adsorption deformation significantly affects the seepage characteristics of coal. However, effect of sorption time on coal permeability and gas pressure has not been investigated systematically. In this study, the sorption experiment of coal samples is conducted to elaborate the importance of sorption equilibration time. Then a coupled coal deformation and gas flow model is established considering the sorption characteristic and permeability evolution. This coupled model is implemented through finite element method to analyze the effect of sorption time on coal permeability and gas pressure. The simulation results reveal that the gas pressure of the coal More >

  • Open Access

    ARTICLE

    Numerical Investigation of Convective Heat Transfer and Friction in Solar Air Heater with Thin Ribs

    Sanjay K. Sharma1, V. R. Kalamkar1, *

    CMES-Computer Modeling in Engineering & Sciences, Vol.114, No.3, pp. 295-319, 2018, DOI:10.3970/cmes.2018.114.295

    Abstract The three-dimensional numerical investigation of an incompressible flow through rib roughened solar air heater is carried out. A combination of thin transverse and truncated ribs is attached on the absorber plate to study its effect on the heat transfer and friction factor. The parameters in the form of Reynolds number (Re) of 4000-16000, relative roughness pitch (P/e) of 8-18 and relative roughness height (e/Dh) of 0.0366-0.055 is considered for the analysis. The CFD code ANSYS FLUENT is used to solve the governing equations of turbulent flow. The RNG k–ε turbulence model is used to solve More >

  • Open Access

    ABSTRACT

    Numerical Investigation of Cathode Water Management in Direct Methanol Fuel Cell with Micro-porous Layer

    Jinghui Jiang1, Yinshi Li1,2,*, Jiarong Liang1, Huaxing Xu1

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.3, pp. 159-159, 2019, DOI:10.32604/icces.2019.05378

    Abstract Water flooding in the cathode is considered as one of the most important factors that impede the performance of direct methanol fuel cells (DMFCs) during the operation of high current density. Therefore, it is essential to study water management of cathode in DMFC. In this work, a two-dimensional, steady-state, two-phase, mass-transport model of DMFC with micro-porous layer (MPL) was developed considering methanol crossover and water crossover processes. Emphasis is placed on investigating parameter design of cathode to relieve flooding in DMFC, further to improve cell performance. The effects of MPL parameters, including porosity and thickness,… More >

  • Open Access

    ABSTRACT

    Numerical Investigation of Heat Transfer to Supercritical Pressure Water in Vertical Tube With Non-Uniform Heating Form

    Zhenchuan Wang1,2, Ruina Xu2, Peixue Jiang2,*

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.3, pp. 154-154, 2019, DOI:10.32604/icces.2019.05023

    Abstract Deeply analysis and prediction of turbulent convection heat transfer of supercritical pressure fluid in one-side non-uniform heating vertical tube plays a major role in system design and security. The Over-prediction of convection heat transfer of supercritical pressure fluid in vertical tube is attributed, at least partly, to the invalid of turbulent model on simulating the buoyancy effect. The present paper adopt an improved turbulent model, which is validated suitable to three dimensional model, to simulate flow and heat transfer of supercritical pressure water in vertical non-uniform heating tube. Heat transfer deterioration phenomenon occurs in non-uniform… More >

  • Open Access

    ABSTRACT

    Numerical Investigation on Resonant Sloshing Characteristics of 2-D Baffled Liquid Container

    Jong-Kook Cha1, Jin-Rae Cho1

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.7, No.3, pp. 129-134, 2008, DOI:10.3970/icces.2008.007.129

    Abstract Sloshing flow is formulated based on the linearized potential flow theory, while an artificial damping term is employed into the kinematic free-surface condition to reflect the eminent dissipation effect in resonant sloshing. Through the numerical analysis of sloshing frequency response with respect to the number, location and opening width of baffle, the sloshing damping characteristics by baffle are parametrically investigated. More >

  • Open Access

    ABSTRACT

    Numerical Investigation on PDEs with Mixed Fuels

    J. Kato1, K. Inaba2, M. Yamamoto3

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.4, No.1, pp. 25-30, 2007, DOI:10.3970/icces.2007.004.025

    Abstract Pulse detonation turbine engines (PDTEs), which are used as power generation, are desirable to use hydrocarbon from the aspect of infrastructure of fuels. In the present study, we investigate the performance of PDEs using mixed hydrocarbon fuels. With the detailed 42-species and 168-step mechanism, numerical simulations on mixed-fuel-and-air PDEs are conducted. We use CH4-C3H8, CH4-H2, and C3H8-H2 as fuels, and examine characteristic features of detonations with different blend ratios. We perform calculations on the Chapman-Jouguet detonation speeds and chemical reaction lengths, and investigate ZND profiles of chemical reactions. Then we evaluate PDEs performances by changing More >

  • Open Access

    ABSTRACT

    Numerical Investigation of Floor Response Spectrum Considering Nonlinear Behavior of Shear Walls in Nuclear Power Plants

    Hyung-Jo Jung, Heekun Ju

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.1, pp. 6-6, 2019, DOI:10.32604/icces.2019.05761

    Abstract The floor response spectrum (FRS) of a nuclear power plant (NPP) structure considering nonlinear behavior of shear walls is numerically investigated. The Hysteretic Material from OpenSees program is applied to a lumped-mass model to consider the nonlinear hysteretic behavior of the element representing the shear wall. Parameters that determine the hysteretic behavior are changed to examine the effects of the parameters on the resulting FRS. The pinching effect, damage due to ductility and energy, and degraded unloading stiffness can be considered with changes in parameter values. The hysteretic behavior of the structure with different parameter values… More >

  • Open Access

    ARTICLE

    A Three Dimensional Numerical Investigation of the T* integral along a Curved Crack Front

    J. H. Jackson1, A. S. Kobayashi2, S. N. Atluri3

    CMES-Computer Modeling in Engineering & Sciences, Vol.6, No.1, pp. 17-30, 2004, DOI:10.3970/cmes.2004.006.017

    Abstract The Tε*  integral was calculated numerically along an extending, tunneling crack front in an 8 mm thick, aluminum three-point bend (3PB) specimen, using a numerical model driven by experimentally obtained surface displacements. The model provided input to a contour integration for the Tε*  integral, via the Equivalent Domain Integral (EDI) method with incremental plasticity. Validity of the analysis was ensured by the agreement of the Tε*  integral obtained on the surface (plane stress) and the plane stress values from previous studies. Tε*   was observed to decrease from the outer surface of the specimen to More >

  • Open Access

    ARTICLE

    Optimum En-Masse Retraction of Six Maxillary Anterior Teeth in Lingual Orthodontics: a Numerical Investigation with 3-Dimensional Finite Element Analysis

    Abhishek M. Thote1,*, Rashmi V. Uddanwadiker1, Krishna Sharma2, Sunita Shrivastava2

    Molecular & Cellular Biomechanics, Vol.14, No.1, pp. 1-17, 2017, DOI:10.3970/mcb.2017.014.001

    Abstract The objective of this study was to devise an optimum force system to achieve en-masse retraction of six maxillary anterior teeth in lingual orthodontics (LiO). First, the set of equations was developed based on the mathematical computation to estimate optimum parameters of force system. Then, the computer software based on this mathematical computation was developed for the ease of estimation of force system. The verification of force system obtained with computer software was accomplished by three-dimensional finite element analysis (FEA). In FEA, it was clear that the desired en-masse retraction of six maxillary anterior teeth More >

  • Open Access

    ARTICLE

    A Numerical Investigation of the Effects of Benign Paroxysmal Positional Vertigo on the Balance Function of the Inner Ear

    Shen Yu1, Jizhe Wang2,*, Yan Guo2,*, Xiuzhen Sun2, Shuang Shen3

    CMES-Computer Modeling in Engineering & Sciences, Vol.116, No.2, pp. 315-322, 2018, DOI: 10.31614/cmes.2018.04028

    Abstract A three-dimensional numerical model of the membranous labyrinth of the semicircular canal of the inner ear was established to investigate the effects of canalithiasis of BPPV on the balance function of the inner ear. The movement of otolith particles in the membranous labyrinth was simulated when a person turns his head to a specific position. The effects of otolith movements on the balance function of the inner ear were simulated for different numbers, diameters, and initial positions of otoliths. The simulation results show that the otolith diameter affects the movement duration of otoliths in the More >

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