竖凹槽内螺旋波纹管的沸腾换热与PEC评价  

Boiling heat transfer and PEC evaluation of helical bellows in vertical grooves

作　　者：王金锋[1,2,3,4] 滕文强 谢晶 朱生林[1] 常婉莹 WANG Jin-feng;TENG Wen-qiang;XIE Jing;ZHU Sheng-lin;CHANG Wan-ying(School of Food,Shanghai Ocean University,Shanghai 201306,China;Shanghai Cold Chain Equipment Performance and Energy Saving Evaluation Professional Technical Service Platform,Shanghai 201306,China;Shanghai Aquatic Product Processing and Storage Engineering Technology Research Center,Shanghai 201306,China;National Experimental Teaching Demonstration Center of Food Science and Engineering of Shanghai Ocean University,Shanghai 201306,China)

机构地区：[1]上海海洋大学食品学院,上海201306 [2]上海冷链装备性能与节能评价专业技术服务平台,上海201306 [3]上海水产品加工及贮藏工程技术研究中心,上海201306 [4]上海海洋大学食品科学与工程国家级实验教学示范中心,上海201306

出　　处：《食品与机械》2021年第5期101-106,143,共7页Food and Machinery

基　　金：“十三五”国家重点研发计划项目(编号:2019YFD0901604)。

摘　　要：以套管结构为设计模型,通过外管流动的水对内管R32加热使其沸腾,采用CFD对不同数量竖凹槽的内螺旋波纹管进行沸腾换热模拟研究。结果表明:与光管相比,内螺旋波纹结构强化了沸腾换热但增大了内管压降,表面换热系数和内管压强分别提高至光管的147%,221%。随着竖凹槽数量的增加,竖凹槽内螺旋波纹管的表面换热系数和内管压降均先增大后减小,当竖凹槽数量为16时均达最大值,分别为光管的157%,261%。此外,通过比较不同数量竖凹槽内螺旋波纹管的强化沸腾效果与泵功率损耗的关系(PEC),发现竖凹槽数量为16时,PEC最大(1.523),因此,竖凹槽数量为16时,竖凹槽内螺旋波纹管性能最优。In this simulation,R32 in the inner tube is heated by the water flowing from the outer tube to make it boil.CFD is used to simulate the boiling heat transfer of the inner spiral bellows with different numbers of vertical grooves.The results showed that compared with the smooth tube,the inner helix corrugated structure enhances the boiling heat transfer but increases the pressure drop of the inner tube.The surface heat transfer coefficient and the inner tube pressure increase to 147%and 221%of the smooth tube,respectively.With the increase of the number of vertical grooves,the surface heat transfer coefficient and the pressure drop of the inner tube first increase and then decrease.When the number of vertical grooves is 16,they reach the maximum value,which are 157%and 261%of the smooth tube respectively.In addition,by analyzing the relationship between enhanced boiling effect and pump loss of different number of vertical grooves,it was found that PEC obtained the maximum value(1.523)when the number of vertical grooves was 16.Therefore,the performance of spiral bellows in vertical grooves is the best when the number of vertical grooves is 16.

关 键 词：竖凹槽 表面换热系数 压降 PEC 

分 类 号：TK172[动力工程及工程热物理—热能工程]