R1234ze(E)与R134a在光管与低肋管外凝结传热数值模拟  

Condensation Heat Transfer Characteristics of R1234ze(E)and R134a outside Plain and Low Rib Tubes

作　　者：党坤儒 Dang Kunru(School of Energy and Environment,Zhongyuan University of Technology,ZhengzhouXinzheng 451191)

机构地区：[1]中原工学院能源与环境学院,郑州新郑451191

出　　处：《科技风》2021年第35期143-146,共4页

摘　　要：使用R1234ze(E)和R134a进行水平光管及低肋管外凝结传热的数值模拟。采用VOF多相流模型和Lee相变传质模型来获得R1234ze(E)和R134a的管外凝结传热特性。模拟结果表明,光管外凝结传热系数与Nusselt理论解的偏差在±10%以内;随着冷凝温度的增加,R1234ze(E)的管外凝结传热系数增大;R134a的管外凝结传热系数要高于R1234ze(E);C4284低肋管相比光管,对管外凝结传热有明显的增强作用,在热流密度为30kW/m 2时,R1234ze(E)在冷凝温度为35℃时,管外凝结传热系数比光管高10.9倍,40℃时比光管高11.7倍。R1234ze(E)and R134a were used for numerical simulation of condensation heat transfer outside plain and low rib tube.The condensation heat transfer characteristics of R1234ze(E)and R134a were obtained by using VOF multiphase flow model and Lee phase change mass transfer model.The simulation results show that the deviation between condensation heat transfer coefficient and Nusselt theory is within±10%.With increase of condensing temperature,the condensation heat transfer coefficient outside the tube of R1234ze(E)increases;the condensation heat transfer coefficient outside the tube of R134a is higher than R1234ze(E);the low rib tube of C4284 has a significant enhancement of condensation heat transfer coefficient outside the tube compared with plain tube.At a heat flow of 30 kW/m 2,R1234ze(E)has 10.9 times higher condensation heat transfer coefficient outside the tube than plain tube at 35℃and 11.7 times higher than plain tube at 40℃.

关 键 词：数值模拟 低肋管 VOF 凝结传热 

分 类 号：TB6[一般工业技术—制冷工程]