非均匀多孔介质层流通道的传热研究

IF 0.6 4区 工程技术 Q4 Engineering Nuclear Engineering International Pub Date : 1997-11-16 DOI:10.1115/imece1997-0615
X. Huang, W. Qin, C. Y. Liu, K. Toh
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引用次数: 0

摘要

本文对二维通道内层流传热进行了数值研究。通道中填充多孔材料,假设多孔材料在整个通道中是不均匀的,特别是在通道壁附近,多孔材料的渗透率急剧增加,以模拟多孔介质与固体壁之间界面的复杂性。多孔材料的不均匀度在本研究中用参数β来描述。恒温热源或定热流密度热源位于通道壁上,因此从热源向通道流动的热量传递受壁面-多孔介质界面条件的影响很大。计算了不同β值下热源附近的温度分布和努塞尔数。评估了通道壁面附近多孔介质的不均匀性对整体换热的敏感性。研究发现,孔道壁面附近较高的多孔材料的非均匀性实际上可以增强源向通道流动的传热,由于近壁面区域多孔材料的高渗透率,使得壁面附近的流动速度显著提高。
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Heat Transfer in Laminar Channel Flow With a Non-Uniform Porous Media
This paper presents a numerical study on heat transfer by laminar flows in a two-dimensional channel. The channel is filled with a porous material which is assumed to be non-uniform across the channel, especially near the channel walls where the permeability of the porous material increases drastically to simulate the complexity at the interface between the porous media and the solid walls. Degrees of the non-uniformity of the porous material are described in this study by a parameter β. Heat sources, either constant temperature or constant heat flux, are located on the channel walls, so that heat transfer from the sources into the channel flow is greatly affected by the condition at the wall-porous media interfaces. The temperature distribution near the heat source region and the Nusselt numbers are calculated for different β values. The sensitivity of the non-uniformity of the porous media near the channel walls on the overall heat transfer is assessed. It is found that a higher non-uniformity of the porous material near the channel wall can actually enhance the heat transfer from the sources to the channel flow, as the flow velocity near the wall has been significantly increased due to the higher permeability of the porous material in the near-wall region.
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来源期刊
Nuclear Engineering International
Nuclear Engineering International 工程技术-核科学技术
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6-12 weeks
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