期刊
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
卷 165, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2020.120675
关键词
Metal foam; Forced convection; Horizontal cylinder; Heat transfer enhancement; Experimental
资金
- Ontario Ministry of Agriculture Food and Rural (OMAFRA)
- University of Guelph in Canada [030371]
The study found that using metal foam layers to wrap a horizontal cylinder can enhance heat transfer performance, with the segmented metal foam layer configuration at an optimum angle of incidence providing the best heat transfer enhancement with a lower pressure drop, signifying the highest overall performance factor.
In the present study, the flow and heat transfer characteristics from a horizontal cylinder in crossflow wrapped with whole and segmented layers of metal foams are investigated. High porosity and thermal conductivity metal foam layers are tested with two different thicknesses. The horizontal cylinders are heated with a uniform heat flux and forced convection tests are conducted for Reynolds number range of 7500 - 18000. The angle at which the metal foam segmented layers are positioned against the incoming flow is varied to study the effect of the angle of incidence on the performance. The heat transfer coefficient and pressure drop are measured in order to determine the overall performance factor which relates the enhancement in heat transfer with the pressure drop augmentation. The experimental results showed that all metal foam configurations outperformed the bare cylinder case. The whole layer configuration showed the highest heat transfer enhancement as opposed to the segmented layer case, but with a higher pressure drop. However, the segmented metal foam layer configuration, at an optimum angle of incidence, provided the best heat transfer enhancement with a lower pressure drop, signifying the highest overall performance factor. (C) 2020 Elsevier Ltd. All rights reserved.
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