基于Fluent的板管型蒸发式冷凝器的流动与换热研究
Fluid Flow and Heat Transfer Investigation of Plate-fin Evaporative Condenser based on Fluent
孙凯 1刘湘云 2柯秀芳 1陈观生 1刘良德 1吴宏伟3
作者信息
- 1. 广东工业大学 材料与能源学院,广东 广州 510006
- 2. 广州城建职业学院机电学院,广东 广州 510925
- 3. 英国赫特福德大学机械工程学院,赫特福德郡 284000
- 折叠
摘要
为了研究板管型蒸发式冷凝器的流动和传热特性,并优化其板片凹陷孔的结构,本研究采用商用软件Fluent对气液流动模型进行数值模拟.通过控制变量、逐层优化的方法,研究了各雷诺数(Re)下板片凹陷孔的不同深度(H)和小直径(D1)对板片流动与换热效率的影响.研究发现,在所有Re的条件下,努塞尔数(Nu)随着H的增大而增大,且存在一个最佳值——H=3 mm,当H继续增加时,Nu反而开始下降.在确定H的最佳值后,发现在所有Re的条件下,不同D1对 Nu的变化影响也存在一个最佳值D1=6 mm,使得换热效果最好.通过实验验证,最佳尺寸下的数值模拟结果与实验结果吻合较好.虽然Re越大,换热效果越好,但也带来了更高的能耗,因此在最佳结构下需要在能耗和效率之间做出取舍.
Abstract
To investigate the flow and heat transfer characteristics of plate-tube evaporative condenser and optimize the structure of concave holes on plate,commercial software Fluent was used in this study to conduct numerical simulations of gas-liquid flow models.By controlling variables and using a layered optimization approach,the effects of different depths(H)and small diameters(D1)of concave holes on the flow and heat transfer efficiency of plate fins under various Reynolds numbers(Re)were investiga-ted.The study found that under all Re conditions,Nusselt number(Nu)increases with the increase of H,and reaches an optimal value at H=3 mm,beyond which it starts to decrease.Once the optimal value of H is determined,the influence of different D,on Nu under all Re conditions exhibits a similar optimal value,with D1=6 mm providing the best heat transfer performance.While higher Re result in better heat transfer performance,they also entail higher energy consumption.Through experimental verification,the numerical simulation results at the optimal dimensions are in good agreement with the experimental re-sults.Therefore,a trade-off between energy consumption and efficiency needs to be considered when determining the optimal structure.
关键词
蒸发式冷凝器/数值模拟/强化换热/结构优化/气液两相Key words
evaporative condenser/numerical simulation/enhanced heat transfer/structural optimiza-tion/gas-liquid two-phase引用本文复制引用
基金项目
广州市黄埔区国际科技合作项目(2021GH14)
出版年
2024
NETL
NSTL
万方数据