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| 1 | 基于REV的保温多孔材料传热“三箱”分析模型显示文摘保温材料广泛应用于建筑中的制冷与空调等领域,保温多孔介质材料的内部结构复杂无规律且孔隙分布具有不确定性,热质传递作用机理复杂多变,目前的分析方法和研究模型普适性差,对一些微观热质传递机理问题尚未提出解决方法。本文基于表征体元REV,建立了保温多孔介质材料传热计算'三箱'分析模型。利用'三箱'模型对保温多孔介质材料传热过程进行分析,并给出各模型下多孔介质导热系数计算公式。基于保温多孔介质材料传热计算'三箱'分析模型,对不同孔隙率、孔隙通道分布系数和迂曲度的硅酸钙材料进行了计算和模拟并研究了其对保温多孔介质材料导热系数的影响,总结出其变化规律。本文所做工作,不仅为保温多孔介质材料传热分析研究提供了新模型与新方法,在其他类型多孔材料研究中也有借鉴意义。 | 王志国 赵子琦 郑刚 晏耿成 朱云鹏 杨文哲 宋永臣 | 2021 | 工程热物理学报2021，42，8： | 6 |
| 2 | Entropy analysis in electrical magnetohydrodynamic(MHD) flow of nanofluid with effects of thermal radiation,viscous dissipation,and chemical reaction显示文摘The unsteady mixed convection flow of electrical conducting nanofluid and heat transfer due to a permeable linear stretching sheet with the combined effects of an electric field, magnetic field, thermal radiation, viscous dissipation, and chemical reaction have been investigated. A similarity transformation is used to transform the constitutive equations into a system of nonlinear ordinary differential equations.The resultant system of equations is then solved numerically using implicit finite difference method.The velocity, temperature, concentration, entropy generation, and Bejan number are obtained with the dependence of different emerging parameters examined. It is noticed that the velocity is more sensible with high values of electric field and diminished with a magnetic field. The radiative heat transfer and viscous dissipation enhance the heat conduction in the system. Moreover, the impact of mixed convection parameter and Buoyancy ratio parameter on Bejan number profile has reverse effects. A chemical reaction reduced the nanoparticle concentration for higher values. | Yahaya Shagaiya Daniel Zainal Abdul Aziz Zuhaila Ismail Faisal Salah | 2017 | Theoretical & Applied Mechanics Letters2017，7，4： | 5 |
| 3 | Magnetohydrodynamic(MHD)boundary layer heat and mass transfer characteristics of nanofluid over a vertical cone under convective boundary condition显示文摘This paper investigates the boundary layer flow,heat and mass transfercharacteristics over a vertical cone filled with nanofluid saturated porous medium with theinfluence of magnetic field,thermal radiation and first order chemical reaction subject to theconvective boundary condition.Similarity transformation technique is used for the purpose ofconverting non-linear partial differential equations into the system of complex ordinarydifferential equations.The computational Finite element method has been employed to solvethe flow,heat and mass transfer equations together with boundary conditions.The impact ofvarious pertinent parameters on hydrodynamic,thermal and solutal boundary layers isinvestigated and the results are displayed graphically.Furthermore,the values of local skin-friction coefficient,rate of temperature and rate of concentration is also calculated and theresults are presented graphically.The comparisons with previously published work is made andfound good agreement.The thickness of thermal boundary layer is increased with increase inthe values of Brownian motion parameter(Nb)and thermophoresis parameter(Ni). | P.Sudarsana Reddy P.Sreedevi Ali J.Chamkha | 2018 | Propulsion and Power Research2018，7，4： | 1 |
| 4 | Partial slip effects in flow over nonlinear stretching surface显示文摘The two-dimensional flow of a viscous nanofluid is investigated.The flow is caused by a nonlinear stretching surface with the slip effects of the velocity, the temperature, and the concentration.The fluid is electrically conducted in the presence of an applied magnetic field.Appropriate transformations reduce the nonlinear partial differential system to an ordinary differential system.The convergent solutions of the governing nonlinear problems are computed.The results of the velocity, the temperature, and the concentration fields are calculated in series forms.The effects of the different parameters on the velocity, the temperature, and the concentration profiles are shown and analyzed.The skin friction coefficient, the Nusselt number, and the Sherwood number are also computed and investigated for different embedded parameters in the problem statements. | T.HAYAT M.IMTIAZ A.ALSAEDI | 2015 | Applied Mathematics and Mechanics(English Edition)2015，36，11： | 0 |
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