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NUMERICAL STUDY ON SORET-effect AND dufour-effect FOR DOUBLE-DIFFUSIVE NATURAL CONVECTION IN POROUS ENCLOSURE

Journal of Hydrodynamics 2003年第6期15卷 88-95页

作者： ChenBao-ming ZhangLi-qiang WangBu-xuan DepartmentofAir-conditioningandRefrigerationEngineering ShandongInstituteofArchitectureandEngineeringJinan250014China DepartmentofThermalEngineering TsinghuaUniversity.Beijing100084China

The influences of Soret effect and dufour effect on the natural convectionand heal and mass transfer for a porous enclosure were investigated by means of the penalty finiteelement method. Numerical results indicate that the Soret and dufour effects have significantinfluences on heat and mass transfer in the presence of large temperature gradient and concentrationgradient.

关键词： soret effect dufour effect natural convection double diffusive heat andmass transfer

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Numerical investigation of dufour and Soret effects on unsteadyMHD natural convection flow past vertical plate embedded innon-Darcy porous medium

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Applied Mathematics and Mechanics(English Edition) 2012年第2期33卷 195-210页

作者： M.Q.AL-ODAT A.AL-GHAMDI Mechanical Engineering Department Faculty of EngineeringUmm Al-Qura UniversityMakkahKingdom of Saudi Arabia Mechanical Engineering Department Al-Huson University CollegeAl-Balqa Applied UniversityIrbidJordan

The dufour and Soret effects on the unsteady twodimensional magnetonyaro dynamics （MHD） doublediffusive free convective flow of an electrically conducting fluid past a vertical plate embedded in a nonDarcy porous medium are investigated numeri cally. The governing nonlinear dimensionless equations are solved by an implicit finite difference scheme of the CrankNicolson type with a tridiagonal matrix manipulation. The effects of various parameters entering into the problem on the unsteady dimension less velocity, temperature, and concentration profiles are studied in detail. Furthermore, the time variation of the skin friction coefficient, the Nusselt number, and the Sherwood number is presented and analyzed. The results show that the unsteady velocity, tem perature, and concentration profiles are substantially influenced by the dufour and Soret effects. When the dufour number increases or the Soret number decreases, both the skin friction and the Sherwood number decrease, while the Nusselt number increases. It is found that, when the magnetic parameter increases, the velocity and the temperature decrease in the boundary layer.

关键词： double-diffusive free convection non-Darcy model magnetohydrodynamic(MHD) porous medium dufour effect Soret effect numerical solution

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Numerical Analysis of the Influence of Buoyancy Ratio and dufour Parameter on Thermosolutal Convection in a Square Salt Gradient Solar Pond

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Fluid Dynamics & Materials Processing 2022年第5期18卷 1319-1329页

作者： Yassmine Rghif Belkacem Zeghmati Fatima Bahraoui Team of Heat Transfer and Energetic(UAE/U10FST) Faculty of Sciences and Techniques of TangierAbdelmalek Essaâdi UniversityTangier90040Morocco Mathematics and Physics Laboratory(LAMPS) Perpignan Via Domicia UniversityPerpignan66860France

Revise the abstract as follows:This work aims to investigate numerically the influence of the buoyancy ratio and the dufour parameter on thermosolutal convection in a square Salt Gradient Solar Pond(SGSP).The absorption of solar radiation by the saline water,the heat losses and the wind effects via the SGSP free surface are *** mathematical model is based on the Navier-Stokes equations used in synergy with the thermal energy *** equations are solved using the finite volume method and the Gauss ***-pressure coupling is implemented through the SIMPLE *** of the SGSP are performed for three values of buoyancy ratio(N=1,2 and 10),three values of dufour parameter(Df?0,0.2 and 0.8)and some sample meteorological data(Tangier,Morocco).Results show that the highest dimensionless temperature of the storage zone is found for N=*** the same zone and for the same value of N,the dimensionless salt concentration decreases very slightly versus time(unlike for N=1 or 2).Moreover,increasing Df from 0 to 0.8 causes a decrease in the dimensionless temperature of the SGSP storage zone and this decrease is more pronounced for N=1 and N=2.

关键词： Buoyancy ratio dufour effect numerical investigation salt gradient solar pond thermosolutal convection

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Fractional Analysis of Viscous Fluid Flow with Heat and Mass Transfer Over a Flexible Rotating Disk

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Computer Modeling in Engineering & Sciences 2020年第4期123卷 377-400页

作者： Muhammad Shuaib Muhammad Bilal Muhammad Altaf Khan Sharaf J.Malebary Department of Mathematics City University of Science and Information TechnologyPeshawarPakistan Institute for Groundwater Studies Faculty of Natural and Agricultural SciencesUniversity of the Free StateBloemfonteinSouth Africa Department of Information Technology Faculty of Computing and Information TechnologyKing Abdulaziz UniversityRabighSaudia Arabia

An unsteady viscous fluid flow with dufour and Soret effect,which results in heat and mass transfer due to upward and downward motion of flexible rotating disk,has been *** upward or downward motion of non rotating disk results in two dimensional flow,while the vertical action and rotation of the disk results in three dimensional *** using an appropriate transformation the governing equations are transformed into the system of ordinary differential *** system of ordinary differential equations is further converted into first order differential equation by selecting suitable ***,we generalize the model by using the Caputo *** numerical result for the fractional model is presented and validated with Runge Kutta order 4 method for classical *** compared results are presented in Table and *** is concluded that the fractional model is more realistic than that of classical one,because it simulates the fluid behavior at each fractional value rather than the integral values.

关键词： Caputo derivatives similarity transformation RK4 soret effect dufour effect

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