Effect of the aspect ratio on natural convection in a porous cavity with a sinusoidal active thermal wall

doi:10.1615/HeatTransRes.2015010480

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	Effect of the aspect ratio on natural convection in a porous cavity with a sinusoidal active thermal wall
	Wu, F.2; Zhou, W.J.3; Wang, G.1; Ma, X.X.2
	2016
关键词	Natural convection Nusselt number Porous materials Counter clockwise rotation Local Nusselt number Local thermal non-equilibrium Natural convective flow Numerical investigations Porous medium Rectangular cavity Sinusoidal heating
卷号	47
期号	3
DOI	10.1615/HeatTransRes.2015010480
页码	309-325
英文摘要	This study reports a numerical investigation of a natural convective flow and heat transfer in a rectangular cavity filled with a heat-generating porous medium by adopting a local thermal nonequilibrium model. All of the walls of the enclosure are adiabatic except for the left wall, which is partially heated and cooled. The results reveal that, as the periodicity is decreased on increase in N, the streamlines vary in different patt erns, including simultaneous clockwise and counterclockwise rotations when N > 1. The temperature fields near the left wall and local Nusselt number of the left wall vary periodically because of the sinusoidal boundary condition. The sinusoidal symmetrical velocity profiles V are observed, and the vertical velocity increases with an increasing aspect ratio. The sinusoidal local Nusselt number profiles are observed with increasing N, and the wave amplitude of the local Nusselt number decreases with an increasing aspect ratio. The aspect ratio has a significant influence on the average Nusselt number of the fluid phase. On the contrary, it has a weak effect on the Nusselt number of the solid phase. There exists an optimal aspect ratio value Ar = 5 that can significantly enhance the heat transfer of the porous cavity. Copyright © 2016 by Begell House, Inc.
会议录	Heat Transfer Research
会议录出版者	Begell House Inc.
语种	英语
ISSN号	10642285
WOS研究方向	Thermodynamics
WOS记录号	WOS:000373499300009
内容类型	会议论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/117704]
专题	兰州理工大学土木工程学院
作者单位	1.School of Civil Engineering, Lanzhou University of Technology, Lanzhou, Gansu; 730050, China 2.School of Chemical Engineering, Northwest University, Taibai North Road 229, Xi'an; 710069, China; 3.Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi; 710049, China;
推荐引用方式 GB/T 7714	Wu, F.,Zhou, W.J.,Wang, G.,et al. Effect of the aspect ratio on natural convection in a porous cavity with a sinusoidal active thermal wall[C]. 见:.