高校化学工程学报2011，Vol.25Issue(1)：24-29,6.
螺旋片强化的套管式换热器壳侧传热特性
Heat Transfer Performance of the Shell Side of Double-Pipe Heat Exchanger Enhanced with Helical Fins
摘要
Abstract
In order to disc over the heat transfer enhancement mechanisms of the shell side of double-pipe heat exchanger with helical fins and to guide the further heat enhancement of this kind of heat exchanger, heat transfer performance and flow resistance of shell side of the above mentioned heat exchanger were investigated experimentally and compared with those of the heat exchanger with smooth inner tube. The fluid flow characteristic and heat transfer performance of the shell side of double pipe heat exchanger with helical fins were investigated numerically by applying realizable k-ε turbulent model, and using the orthogonal helical coordinate system, the fluid flow characteristics of the shell side helical channel were analyzed. The experimental results show that the heat transfer performance of double-pipe heat exchanger shell side is enhanced significantly by helical fins, and at Re = 4000～14000, the heat transfer coefficients of the exchangers with pitch angle 45°, 37°, 27°,14° respectively are 1.3～4.2 times as much as that of the exchanger with smooth inner tube. It was also found that thc smaller the pitch angle, the higher the heat efficiency; however, the pressure drop increases with thc decrease of pitch angle. The numerical simulation results show that the helical fins can change the fluid flow characteristics of the shell side, and the secondary flow appeared in the flow field enhances the heat transfer performance. It was also found that, with the increase of the pitch angle, the secondary flow at the center of the helical channel weakens. Therefore, as to the heat exchanger with large pitch angle, in order to improve its heat transfer performance further, the most important thing is that some other enhancement measures should be adopted to combine with the use of helical fins to strengthen the secondary flow at the center of the helical channel.关键词
螺旋片/套管式换热器/强化传热/螺旋升角/二次流动Key words
helical fin/ double-pipe heat exchanger/ heat transfer enhancement/ pitch angle/ secondary flow分类
能源科技引用本文复制引用
张丽,田密密,吴剑华..螺旋片强化的套管式换热器壳侧传热特性[J].高校化学工程学报,2011,25(1):24-29,6.基金项目
中央支持地方高校发展专项资金项目(2050205) （2050205）
辽宁省高校创新团队项目(2007T143). （2007T143）
