Numerical analysis of entropy generation in nanofluid flow over a transparent plate in porous medium in presence of solar radiation, viscous dissipation and variable magnetic field

被引：0
作者：
Mohammad Dehsara
Nemat Dalir
Mohammad Reza Heirani Nobari
机构：
[1] Amirkabir University of Technology,Department of Mechanical Engineering
[2] Islamic Azad University,Department of Mechanical Engineering, Salmas Branch
来源：
Journal of Mechanical Science and Technology | 2014年 / 28卷
关键词：
Entropy generation; Inclined plate; Mixed convection; Nanofluid; Porous medium;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
The entropy generation of magneto-hydrodynamic mixed convection flow of nanofluid over a nonlinear stretching inclined transparent plate embedded in a porous medium due to solar radiation is investigated numerically. The nanofluid is made of Cu nanoparticles with water as the base fluid. The two-dimensional governing equations, in presence of the effects of viscous dissipation, variable magnetic field and solar radiation are transformed by similarity method to two coupled nonlinear ODEs and then solved using the numerical implicit Keller-Box method. The effects of various parameters such as nanoparticle volume fraction, magnetic parameter, porosity, effective extinction coefficient of porous medium, diameter of porous medium solid particles and Eckert, Brinkman and Hartman numbers is investigated on velocity, temperature and entropy generation number profiles. The results reveal that near to the plate surface the increase of nanoparticle volume fraction, porosity and porous medium geometric parameter cause the entropy generation number to increase, but far enough from the plate surface the increase of nanoparticle volume fraction, porosity and porous medium geometric parameter cause the entropy generation number to decrease. Also the entropy generation number increases with the increase of Brinkman number and Hartman number, and this increase is dominant near the plate surface. Closer to the plate surface the reduction of Eckert number causes the increase of entropy generation number, but the entropy generation number increases with the increase of Reynolds number.
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页码：1819 / 1831
页数：12
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共 70 条
  • [1] Bejan A(1984)The non-Darcy regime for vertical boundary layer natural convection in a porous medium International Journal of Heat and Mass Transfer 27 717-722
  • [2] Poulikakos D(1980)Mixed convection boundary layer flow on a vertical surface in a saturated porous medium Journal of Engineering Mathematics 14 301-313
  • [3] Merkin J H(1997)Solar radiation assisted natural convection in uniform porous medium supported by a vertical flat plate ASME Journal of Heat Transfer 119 89-96
  • [4] Chamkha A J(1997)Effects of transverse magnetic field, Prandtl number and Reynolds number on non-Darcy mixed convective flow of an incompressible viscous fluid past a porous vertical flat plate in a saturated porous medium International Journal of Energy Research 21 87-100
  • [5] Takhar H S(2010)MHD free convection-radiation interaction along a vertical surface embedded in Darcian porous medium in presence of Soret and Dufour’s effects Thermal Science 14 137-145
  • [6] Beg O A(1984)Mixed convection boundary layer flow along a vertical surface in a porous medium Numerical Heat Transfer 7 305-317
  • [7] Tak S S(2004)Combined radiation and mixed convection from a vertical wall with suction/injection in a non-Darcy porous medium Acta Mechanica 168 145-156
  • [8] Mathur R(2001)Anomalously thermal conductivity enhancement in nanotube suspensions Applied Physics Letters 79 2252-2254
  • [9] Gehlot R K(2009)Natural convection heat transfer in an inclined enclosure filled with a water-CuO nanofluid Numerical Heat Transfer; Part A: Applications 55 807-823
  • [10] Khan A(2005)Heat transfer enhancement by using nanofluids in forced convection flow International Journal of Heat and Fluid Flow 26 530-546
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