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Numerical Simulation of Heat Transfer Enhancement of a Solid Cylinder Wrapped with a Porous Layer
Author(s): 
Pages: 423-426
Year: Issue:  2
Journal: Journal of Engineering Thermophysics

Keyword:  porous mediumheat transfer enhancementforced-convection heat transfernumerical simulation;
Abstract: In the present study flow-field and temperature-field around a cylinder wrapped with a porous layer are investigated numerically.Effects of several parameters,such as porous layer thickness ep and permeability Da as well as Reynolds number on flow-field and heat transfer characteristics are examined.The numerical results indicate that the presence of a porous layer has a strong effect on the heat transfer enhancement around the cylinder.The heat transfer is about 2.85.4 times enhanced compared to that around a cylinder without a porous layer.The wall averaged Nusselt number increased when ep or Re increased,and decreased with Da increased.The drag coefficient Cd increased with the increase of ep,but it increased as the speed increased initially and decreased afterwards,then it remains unchanged when Da <1×10-5.
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