The Fluent software was employed to simulate BR0.015F corrugated plate heat exchangers;and the effects of corrugated sheet's inclination angle,height and interval on the heat transfer and pressure drop were discussed to find out the relations between the flow velocity within the sheets and the corresponding Nusselt number,and the friction factor and the heat transfer factor.The results indicate that,as for the effect on the heat transfer efficiency,the interval's effect is greater than that of both inclination angle and height,and the interval's effect on the pressure drop is less than that of both inclination angle and height;regarding the effect on the flow condition,the effect of both inclination angle and interval exceeds that of the height.Comparative results show that when the corrugated inclination angle is 60° and the segment height ratio is 2.4,the plate heat exchanger has good heat transfer efficiency.

A calculation model was built up for fluid flow and heat transfer in cold and hot flow channels of a chevron-type plate heat exchanger. Using CFD software, numerical simulations were carried out for fluid flow and heat transfer inside the heat exchanger under conditions of five different velocities, while the velocity field, temperature field and pressure field in the channels analyzed. Results show that the error of both temperature difference and pressure drop are all less than 6% between simulated and test results at inlet and outlet of heat exchanger. Obvious non-uniformity of flow and heat transfer exists in the heat exchanger, resulting in obvious heat transfer'dead zone at another side of inlet/outlet. The total heat transfer coefficient and channel resistance increase with rising flow velocity.

基于传热学控制方程,采用数值计算方法,对板式换热器单边流动和对角流动时的流动与换热特性进行分析.在分析过程中保持换热器的结构参数不变,只改变进出口的流动方式,结果发现:在相同的流速下,单边流动的总对流换热系数要高于对角流动,而总压降单边流动要低于对角流动,在流速u=0.6 m/s工况下,努谢尔数单边流动比对角流动高出10.87％,压降对角流流动比单边流动高出5.13％.随着进口流速的增大,单边流动与对角流动的冷热流体进出口温差均减小,而且减小的趋势对角流动要大于单边流动,摩擦因子f和传热因子j逐渐减小.单边流动的流动和传热特性要优于对角流动.