折流杆换热器数值模拟及性能分析

Numerical Simulation and Performance Analysis of Rod Baffle Heat Exchanger

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,通过编写相应的程序,采用数值模拟的方式求出了折流杆换热器壳程压降和传热系数。与实验结果比较表明,壳侧压降的绝对偏差在5%以内,传热系数的绝对偏差在8%以内,能够满足工程设计要求。在此基础上,分析了折流栅的有效流通面积和间距对折流杆换热器综合性能的影响,并将这2个参数引入到准数方程式中,得到了折流杆换热器的准数方程式,为获得折流杆换热器的整体性能提供了一种低成本的研究方法。

Based method for predic on the tin was developed. With g the this platform of PHEONICS version3. 5. 1, a three-dimensional numerical turbulent fluid flow behavior in shell side of rod baffle heat exchangers method, the modeling of the tube bundle was carried porous media concept using volumetric porosities and applicable flow resistance out based on the correlations. The results showed that the simulation results and experimental results were good agreement in shell side. The maximum deviation absolute value of pressure drops of was less than 5 %, and the heat transfer coefficients maximum deviation absolute value was less than 8%. The numerical model was used to analyze the influence factors of the whole performance and the equation of dimensionless about heat transfer and pressure drop was obtained. The low cost method was found to obtain the whole performance of rod baffle heat exchanger.