折流杆换热器壳程流场和温度场的数值模拟及场协同分析

Numerical simulation of the shell side flow in rod baffle heat exchangers and analysis of field coordination

在PHOENICS-3.5.1程序的基础上,引入多孔介质模型,用体积多孔度、表面渗透度和各向异性的分布阻力来处理换热器内的管束,用分布热源考虑管侧流体对壳侧流体的影响,对折流杆换热器的壳程流场和温度场进行了数值模拟,并对其温度梯度与速度矢量的夹角进行了计算。结果表明,采用换热器三维流动计算模型和kε-湍流模型能较好地模拟折流杆换热器壳侧内的流场分布。通过数值模拟可直观地了解换热器壳侧内流体的流动状态,确定流动的高、低速区。除出、入口外,换热器的场协同效果较好。

Based on the platform of PHEONICS,a three-dimensional numerical method for predicting the turbulent fluid flow behavior in shell side of rod baffle heat exchangers is developed. With this method, the modeling of the tube bundle is carried out based on the porous media concept using volumetric porosities and applicable flow resistance correlations. Turbulence effects are modeled using a standard κ-ε model. The three-dimensional model is validated by comparison between computed pressure drops and experiments obtained on a rod baffle heat exchanger. Mean- while, the analysis of field coordination of the shell side is carried out.