板翅式换热器RANS模拟的湍流模型适应性研究  

Study on the Adaptability of Turbulence Model for RANS Simulation of Plate-Fin Heat Exchangers

作　　者：任文文 REN Wen-wen(Wuhuan Engineering Co.,Ltd.,Wuhan Hubei 430223,China)

机构地区：[1]中国五环工程有限公司,湖北武汉430223

出　　处：《化肥设计》2024年第6期7-11,35,共6页Chemical Fertilizer Design

摘　　要：以平直型和锯齿型板翅式换热器为研究对象,为了提高换热器通道内流动换热特性的计算精度,采用黏性底层直接作用到壁面的湍流模型及层流模型,对大雷诺数范围(300~10000)下的换热通道摩擦因子f和传热因子j进行预测。计算结果表明:平直型板翅式换热器,当Re<1000时,采用层流模型计算适应性最佳;当1000<Re<6000时,采用7方程的RSM Stress-Omega湍流模型适应性最优;当Re>6000时,采用基于充分湍流假设的标准κ-ω湍流模型适应性最优,当Re=10000时,摩擦因子f和传热因子j预测相对误差分别为10.01%和1.46%。锯齿型板翅式换热器采用低Re数修正的SSTκ-ω湍流模型适应性最优。To improve the calculation accuracy of the fluid interchange characteristics in the heat exchanger channel,this paper takes flat and serrated plate-fin heat exchangers as its study objects to predict the friction factor f and the heat transfer factor j in the heat exchanger channel under a large Reynolds number range(300~10000)via turbulence model and laminar flow model,in which the viscous bottom layer directly acts on the wall.The calculation results show that when Re<1000,the laminar flow model is the best for calculation adaptability of the flat plate fin heat exchanger.When 1000<Re<6000,RSM Stress-Omega turbulence model with 7 equation has the best adaptability.When Re>6000,the standardκ-ωturbulence model based on sufficient turbulence assumption is used to optimize the adaptability.When Re=10000,the predicted relative errors of friction factor f and heat transfer factor j are 10.01%and 1.46%,respectively.The SSTκ-ωturbulence model modified with low Re number is used to optimize the adaptability of the serrated plate-fin heat exchanger.

关 键 词：湍流模型 RANS模型 板翅式换热器 摩擦因子 传热因子 

分 类 号：TQ051[化学工程]