文献类型：会议论文

英文题名：A numerical study on the shell-side turbulent heat transfer enhancement of shell-and-tube heat exchanger with trefoil-hole baffles

作者：Zhou, Guo-Yan[1];Xiao, Jingmei[1];Zhu, Lingyun[1];Wang, Juntao[1];Tu, Shan-Tung[1]

机构：[1]E China Univ Sci & Technol, Key Lab Pressure Syst & Safety MOE, Shanghai 200237, Peoples R China

会议论文集：7th International Conference on Applied Energy (ICAE)

会议日期：MAR 28-31, 2015

会议地点：Abu Dhabi, U ARAB EMIRATES

语种：英文

外文关键词：trefoil-hole baffle; shell-and-tube heat exchanger; shell side; heat transfer enhancement; numerical investigation

摘要：Shell-and-tube heat exchangers with trefoil-hole baffles are new type heat transfer devices and widely used in nuclear power system due to their special advantages, with the fluid flowing longitudinally on the shell side. However, very few related academic literature are available. In order to obtain an understanding of the underlying mechanism of shell-side thermal augmentation, a CFD model including inlet and outlet nozzles is proposed in the present study. Based on the RNG k-epsilon model, numerical investigations on shell-side fluid flow and heat transfer are conducted by using commercial CFD software FLUENT14.0. The results show that the fluid is fully developed after the first trefoil-hole baffle. The heat transfer coefficient and pressure drop vary periodically along the axial direction. Fluid velocity increases gradually and the jet flow forms in the region near baffles. The secondary flow is also produced on the two sides of baffles when the fluid flows through trefoil-hole baffle. The jet flow and secondary flow can decrease the thickness of boundary layer and then enhance the heat transfer. (C) 2015 Published by Elsevier Ltd.