本文采用实验及数值模拟两种方法研究了板翅式换热器流动和换热的性能。通过数值模拟计算得出换热器内各截面的温度场、压力场分布，通过数值模拟和实验测量得到了不同状况下努塞尔数Nu，表面换热因子j，阻力系数，和功率因子α^＊等换热器性能参数。实验与数值模拟结果吻合较好。结果表明，随着Re的增大，换热器的努塞尔数Nu、传热表面功率因子α^＊均在增大；而j因子及f因子则随着Re的增大在逐渐减小。获得了Nu、α^＊及f与Re的关联式，为板翅式换热器的设计提供了指导。
Experimental and numerical studies were carried out on the flow and heat transfer characteristics of a plate-fin heat exchanger. The temperature and pressure fields in each section of the heat exchanger were obtained by means of numerical simulation. Some performance pa- rameters of the plate-fin heat exchanger, such as Nusselt number Nu, surface heat transfer factor j, friction factor f and power factor α＊, under various working conditions were obtained both numerically and experimentally. The variation curves of these parameters with Re are plotted. The results indicated that N u and α＊ increase with increasing Re, while j and f decrease with increasing Re. The correlations of Nu, α＊ and f with Re were obtained for the design of plate-fin heat exchanger.
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