析湿工况下平直开缝翅片传热传质特性的数值研究  

Numerical study on heat and mass transfer characteristics of straight slotted fins under wet conditions

作　　者：何洋 高森虎 吴青云 张明理 龙涛 牛佩[1] 高景辉[1] 孟颖琪[1] HE Yang;GAO Senhu;WU Qingyun;ZHANG Mingli;LONG Tao;NIU Pei;GAO Jinghui;MENG Yingqi(Xi’an Thermal Power Research Institute,Xi’an 710061,Shaanxi,China;Huaneng Qinmei Ruijin Power Generation,Ganzhou 341000,Jiangxi,China)

机构地区：[1]西安热工研究院有限公司,陕西西安710061 [2]华能秦煤瑞金发电有限责任公司,江西赣州341000

出　　处：《化工学报》2023年第3期1073-1081,共9页CIESC Journal

摘　　要：针对现有冷凝模型计算中未考虑对流传质对传质通量的影响,利用Fluent软件中的UDF建立了新的对流冷凝传热模型和基于场协同理论的传热传质特性分析方法。使用新的冷凝模型和分析方法对除湿条件下,入口参数、翅片结构、开缝位置对平直开缝翅片换热器湿空气侧的流动、传热和传质特性的影响进行了研究。结果表明:考虑对流传质的冷凝模型准确度得到提升;传热量、冷凝量随翅片表面开缝高度的增加先减小后增加;上游开缝翅片管的传热量、冷凝量均低于下游开缝翅片管,利用建立的分析方法发现,相同边界条件下,下游开缝翅片的传热场协同角αm、传质场协同角βm均小于上游开缝翅片,表明下游开缝翅片的速度场、温度梯度场和浓度梯度场的协同性更优,传热传质能力更强。In this paper,a new convection condensation heat transfer model and an analysis method of heat and mass transfer characteristics based on field synergy theory are established by using UDF in fluent,aiming at the lack of consideration of the influence on mass transfer in the calculation of mass transfer flux of existing condensation models.The flow,heat transfer and mass transfer characteristics of wet air side of straight slotted fin heat exchanger under dehumidification conditions are studied by using new condensation model and analysis method.The results show that the accuracy of condensation model considering convective mass transfer is improved.The amount of heat transfer and condensation decreases first and then increases with the increase of the slit height on the fin surface.The heat transfer and condensation of the upstream slotted fin tube are lower than those of the downstream slotted fin tube.Using the established analysis method,it is found that under the same boundary conditions,the synergistic angleαm andβm of the downstream slotted fin are smaller than those of the upstream slotted fin,which indicates that the downstream slotted fin has better synergy between the velocity field and the temperature gradient field,the velocity field and the concentration gradient field,and the heat and mass transfer capacity is stronger.

关 键 词：平直开缝翅片 传热传质 除湿条件 冷凝传热模型 场协同理论 

分 类 号：TK124[动力工程及工程热物理—工程热物理]