A Novel Approach of Heat Rate Enhancement in Rectangular Channels with Thin Porous Layer at the Channel Walls

Sci

Mohamad Ziad Saghir¹ 

[1] Department of Mechanical and Industrial Engineering, Ryerson University, Toronto, ON M5B 2K3, Canada;

关键词: rectangular channels;    laminar flow;    forced convection;    heat transfer enhancement;    pressure drop;    performance evaluation criteria;   

DOI  :  10.3390/sci3040042

来源: DOAJ

【 摘 要 】

Heat transfer enhancement is a topic of great interest nowadays due to its different applications in industries. A porous material also known as metallic foam plays a major role in heat enhancement at the expense of pressure drop. The flow in channels demonstrates the usefulness of this technology in heat extraction. In our current study, a porous strip attached to the walls of the channels is proposed as an alternative for heat enhancement. The thickness of the porous strip was varied for different Reynolds numbers. By maintaining a laminar regime and using water as a fluid, we determined an optimum thickness of porous material leading to the highest performance evaluation criterion. In our current study, with the aspect ratio being the porous strip thickness over the channel width, an aspect ratio of 0.2 is found to be the alternative. A 40% increase in heat enhancement is detected in the presence of a porous strip when compared to a clear channel case for a Reynolds number equal to 200, which improves further as the Reynolds number increases accordingly.

【 授权许可】

Unknown