期刊
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
卷 41, 期 -, 页码 68-75出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.icheatmasstransfer.2012.11.006
关键词
Turbulent heat transfer; Helically corrugated tube; Nanofluid; Mixture model
Turbulent heat transfer in heated helically corrugated tube was investigated numerically for pure water and water-alumina nanofluid using two phase approach. The study was carried out for different corrugating pitch and height ratios at various Reynolds numbers ranging from 10,000 to 40,000. The effect of nano-particles in heat transfer augmentation for smooth tube and helically corrugation tubes (HCT) was discussed and their relative Nusselt number was compared. Results show that the heat transfer enhancement is promoted extremely by increasing the volume fraction of nano-particles. Adding 2% and 4% nano-particles by volume to water enhances the heat transfer by 21% and 58%, respectively. Also, the overall enhancement in heat transfer using two mechanisms simultaneously compared to using pure fluid within smooth tube exceeds over 330%. A correlation is given based on curve fitting from numerical data. Results indicate that using nano-particles yields different enhancement in heat transfer of tube for different corrugation height and pitch. (C) 2012 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据