螺旋折流板换热器的协同角分布特性及局部换热特征  

Field synergy angle distribution and local heat transfer characteristic in shell and tube heat exchanger with helical baffles

作　　者：张剑飞[1] 陶文铨[1] 何雅玲[1] 

机构地区：[1]西安交通大学能源与动力工程学院,热流科学与工程教育部重点实验室,陕西西安710049

出　　处：《化工学报》2013年第8期2769-2773,共5页CIESC Journal

基　　金：国家自然科学基金项目(51206129);国家重点基础研究发展计划项目(2013CB228304)~~

摘　　要：采用商用软件GAMBIT和FLUENT对3种不同螺旋角的螺旋折流板换热器周期性模型进行了三维数值模拟计算分析。计算发现40°角模型的Nusselt数最高而平均协同角最小,结论符合场协同原理。揭示了螺旋折流板换热器内场协同角的分布特征,发现螺旋折流板换热器整场的场协同角分布相当均匀。同时,对螺旋折流板换热器内不同区域的局部换热特征进行了研究,发现中心区域的换热强度随Reynolds数逐渐增强。Three dimensional numerical simulation and field synergy principle analysis were conducted with simplified periodic models for shell and tube heat exchangers with helical baffles at three helix angles（30°,40°and 50°）,and commercial codes of GAMBIT 2.3 and FLUENT 6.3 were adopted in the simulation.It is found that Nusselt number from the model with 40° angle is the largest and the predicted average field synergy intersection angle is the smallest,which is consistent with the field synergy principle.The distribution characteristics of field synergy angles reveal that the distribution is quite uniform through whole shell side of the exchangers.The investigation on local heat transfer characteristics in different regions on the shell side shows that the heat transfer rate in the central region of the heat exchanger increases with the increase of Reynolds number.

关 键 词：螺旋折流板换热器 周期性模型 换热特性 场协同 数值模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理]