绕管式换热器壳侧流场流动与传热的数值模拟研究

Study on Flow and Heat Transfer of the Shell Side in Spiral-wound Heat Exchangers Based on Numerical Simulation

基于流体动力学数值模拟软件Fluent的应用,分别选取了标准k-ε模型、RNG k-ε模型对绕管式换热器壳侧流场过热蒸汽流进行数值模拟。分析了绕管式换热器壳侧流场过热蒸汽流传热过程的换热系数和压力降梯度,并与Fredheim试验结果进行比较。结果表明:绕管式换热器壳侧流场过热蒸汽流传热过程的数值模拟结果与试验结果相符,换热系数为200~1000 W/(m^2·K),压力降梯度为500~5000 Pa/m,误差为±20%,验证了数值模拟计算方法的准确性。

Based on the application of Fluent which was numerical simulation software in the fluid dynam- ics, standard κ-ε model, RNG κ-ε model were selected as the foundation of the numerical simulation model in the shell side of spiral wound heat exchangers for the flow turbulence of superheated steam. Heat transfer coefficient and pressure drop gradient were studied in the heat transfer process which superheated steam flow in the heat exchanger. Compared with the Fredheim experiment results, the heat transfer coeffi- cient was 200 - 1000 W/（ m2 · K） and pressure gradient was 500 -5000 Pa/m. The result error was less than ± 20% and it was reasonable .