板管型降膜式蒸发器换热特性数值模拟  

Numerical Simulation on Heat Transfer Characteristics of Plate and Tube Falling Film Evaporator

作　　者：谢健 陈观生[1] 罗硕成 刘湘云[1] 柯秀芳[1] 刘良德[1] Xie Jian;Chen Guansheng;Luo Shuocheng;Liu Xiangyun;Ke Xiufang;Liu Liangde(School of Material and Energy,Guangdong University of Technology,Guangzhou,510006;Guangzhou Wide Industry Co.,Ltd,Guangzhou,510663)

机构地区：[1]广东工业大学大学,广州510006 [2]广州华德工业有限公司,广州510663

出　　处：《制冷与空调（四川）》2024年第1期40-46,60,共8页Refrigeration and Air Conditioning

基　　金：广州市黄浦区科学技术局国际科技合作项目(2021GH4)。

摘　　要：降膜式蒸发器兼有满液式蒸发器换热效果好及干式蒸发器制冷剂充灌量小的特点。对板管型降膜式蒸发器进行了数值模拟,得出了其在使用R410A为制冷工质时,条缝宽度、喷淋密度及板面温度对蒸发器换热性能的影响。结果表明,当工质入口条缝宽度为1.5mm时,板面的液膜覆盖率及换热系数最大,条缝宽度小于或大于1.5mm时,板面的液膜覆盖率及换热系数均有所降低;板面的液膜覆盖率及其换热系数随着液膜雷诺数的增加而增加,但当液膜雷诺数达到10000以上时,增加幅度明显减小并趋于零;板片温度升高可以增强蒸发器的换热性能,但雷诺数较小时的影响很小,只有雷诺数足够大时板片温度的影响才得到明显的体现。The falling film evaporator has the characteristics of higher heat transfer efficiency of flooded evaporator and smaller refrigerant filling capacity of the dry-type evaporator.This article conducts numerical simulation on the plate tube falling film evaporator and obtains the effects of slot width,spray density and plate surface temperature on the heat transfer performance of the evaporator when R410A is used as the refrigerant.The results show that when the width of the working fluid inlet slit is 1.5mm,the liquid film coverage and heat transfer coefficient on the board surface are the highest.When the slit width is less than or greater than 1.5mm,the liquid film coverage and heat transfer coefficient on the board surface are both reduced;The liquid film coverage and heat transfer coefficient of the plate surface increase with the increase of the liquid film Reynolds number,but when the liquid film Reynolds number reaches over 10000,the increase amplitude significantly decreases and tends to zero;The increase in plate temperature can enhance the heat transfer performance of the evaporator,but the effect is very small at low Reynolds number.Only when the Reynolds number is large enough the influence of plate temperature can be reflected significantly.

关 键 词：降膜蒸发器 传热 数值模拟 两相流 流动 

分 类 号：TB657.5[一般工业技术—制冷工程]