湍流模型在折流板换热器壳侧结构优化中的应用

研究不同湍流模型在换热器流场和传热计算中的适用性,分别采用Spalart-Allmaras湍流模型、标准k-ε湍流模型和可实现k-ε湍流模型计算换热器在不同入口速度下的出口温度、换热系数等参数.将3种湍流模型的CFD计算结果与Bell-Delaware理论计算值进行对比可知,Spalart-Allmaras湍流模型的换热器性能数值计算存在明显缺陷,可实现k-ε湍流模型的换热器CFD较其他两种湍流模型的更为适用.将适用性较好的可实现k-ε湍流模型进行CFD数值模拟,模拟结果表明挡切率为25%时换热器性能最佳.

Application of turbulence model in baffle heat exchanger shell side structural optimization

Different turbulence models in the flow field of heat exchanger and heat transfer calculations applicability had been researched .In order to calculate the equation of the parameters at different heat exchanger outlet temperature of the inlet velocity ,heat transfer coefficient Spalart‐Allmaras turbulence model and the standard k‐εmodel and realizable k‐εmodel were used respectively .The comparison of 3 kind models between CFD calculations of turbulence model and the theoretical calculations of Bell‐Delaware indicated that Spalart‐Allmaras one equation turbulence model had flaw in the numerical calculation of heat exchanger performance .The realizable k‐εturbulence model equation was more applicable to CFD simulation of heat exchangers by comparing to other two turbulence models .Authors used the realizable k‐εturbulence model for simulation .The simulation results showed that the heat exchanger performed best when the baffle cut was 25% .