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本文对平直翅片管翅式换热器在考虑翅片效率和不考虑翅片效率2种情况下分别进行了层流状态下的流动和换热的三维数值模拟,研究了2种情况下Re数对换热量、Nu数及协同角的影响,并从场协同角度进行了分析。结果表明,Re数取200～1 700范围内的6个不同值,在不考虑翅片效率时,换热量分别增大了3.44%、4.76%、7.48%、12.68%、16.04%和19.56%。随着Re数的增大,翅片效率对模拟结果的影响也会增大,即在高Re数下不可忽视翅片效率对结果的影响。本文还从翅片效率的根本定义出发,得出了不同Re数下的翅片效率,为计算翅片效率提供了一个新的思路。
In this paper, the three-dimensional numerical simulation of the flow and heat transfer in the laminar flow state of the fin-and-tube fin-and-tube heat exchanger was carried out considering both the fin efficiency and the fin efficiency. In both cases Re number on the heat transfer, Nu numbers and the synergy angle, and from the field of synergy perspective analysis. The results show that the heat transfer increases by 3.44%, 4.76%, 7.48%, 12.68%, 16.04% and 19.56%, respectively, when the Re number takes six different values in the range of 200 to 1,700 without considering the fin efficiency. . As the Re number increases, the influence of the fin efficiency on the simulation results also increases, ie the effect of the fin efficiency on the results can not be ignored at high Re numbers. Based on the fundamental definition of fin efficiency, the paper obtains the fin efficiency under different Reynolds number, which provides a new idea for calculating fin efficiency.