标题：A numerical study of fluid and heat transfer performance of heat exchangers with novel short-circuit prevention helical baffles
作者：Du, Wenjing ;Wang, Hongfu ;Xin, Gongming ;Cheng, Lin
作者机构：[Du, Wenjing ;Wang, Hongfu ;Xin, Gongming ;Cheng, Lin ] Institute of Thermal Science and Technology, Shandong University, Jinan, Shandong; 250061, Chi 更多
会议名称：15th International Heat Transfer Conference, IHTC 2014
会议日期：10 August 2014 through 15 August 2014
来源：Proceedings of the 15th International Heat Transfer Conference, IHTC 2014
关键词：Heat exchanger; Helical baffle; Numerical simulation; Short-circuit prevention
摘要：Three physical models of short-circuit prevention helical baffled heat exchanger (HBHE) are builtin this paper. The corresponding numerical simulations are performed on HBHE by software ANSYS CFX. The influence of short-circuit prevention plates on flow and heat transfer and resistance performance are investigated under different helical angle (10°, 25°, 40°) and different working conditions, and comparison is made between the novels and the conventional HBHE. Analyses of numerical results indicate that at relative small helical angel, short-circuit prevention HBHE shows relatively better fluid flow performance because the leakage flow in the triangle area is reduced and the uniformity of velocity distribution and stability of flow are improved, meanwhile the comprehensive heat transfer performance of short-circuit prevention HBHE is better than that of conventional HBHE. At relative large helical angel, the widened section of short-circuit prevention baffle has less diversion function on flow, and the difference of velocity distribution and resistance loss between the two plates becomes smaller, meanwhile the comprehensive heat transfer performance of short-circuit prevention HBHE is less than that of conventional HBHE with the same working condition. Therefore, shortcircuit prevention helical baffles is not suitable at a relatively larger helix angle. Related conclusions in this paper are useful for the selection of helical baffles shapes when people are faced with this issue.