Numerical Simulation of Heat Transfer in Rod-Support Heat Exchanger
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摘要: 采用数值模拟方法研究杆式支撑换热器,可以克服实验研究方式的不足。利用相似理论确定数值模拟模型,分析了各结构参数变化对换热器传热和流动性能的影响。利用最小二乘法,进一步回归出杆式支撑换热器层流下的传热和流动阻力的准数关联式。设计、建造了一套可变结构参数的杆式支撑换热器热模实验装置,在壳程单排管间布杆或双排管间布杆、不同流速和不同折流栅结构参数情况下测得了100个实验值,将实验测量值和计算值进行了比较。结果表明:数值模拟计算的Nu值和ΔP值与实验测量值吻合很好,由实验数据回归得到的传热和流动阻力无因次准数关系式与数值模拟程序计算得到的准数关系式也吻合较好,显示出数值模拟方式进行换热器研究的显著优点。Abstract: The numerical simulation method is put forward to research the rod-support heat exchanger,in order to overcome the shortcoming of the main method of experiment.Numerical simulation model is established by using theory of similarity,and the various structure parameters that affect the characteristics of heat transfer and fluid flow in rod-support heat exchanger are studied.The modulus formulas of the heat transfer and flow resistance in the laminar flow have been derived by using the least-squares method.A set ofvariable structure parameter experimental equipment for the rod-support heat exchanger is designed and manufactured.100 experiment data are obtained under the conditions of the rod-array between single-row tubes and the rod-array between double-row tubes and different structure parameter.The results show a well agreement between the computed and experimented values.It is favorable to use the numerical simulation method in the research and development of heat exchangers.
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