正六边形板式换热器传热和流动特性研究

STUDY ON HEAT TRANSFER AND FLOW CHARACTERISTIC OF REGULAR HEXAGONAL PLATE HEAT EXCHANGER

本文研究了一种具有球面肋的正六边形板式换热器,分别对其两流体和三流体换热的情况进行数值模拟,讨论了其在顺流和逆流状态下的性能。与60°的人字形板式换热器进行比较,正六边形板式换热器在单位压降下的综合传热性能较优。本文还拟合了传热准则方程式和摩擦系数方程式。结果表明,该种新型板式换热器结构紧凑,布置灵活,具有好的综合传热性能。分析认为球面肋提高了局部场协同的程度。

A novel Regular Hexagonal Plate Heat Exchanger was investigated in this paper. Numerical simulation was performed when heat was transferred between two or three fluids. Characteristics on heat transfer and flow were investigated in the case of both parallel-flow and counter-flow. Comparing with the 60° chevron-type plate heat exchanger, the Regular Hexagonal Plate Heat Exchanger is better in the aspect of comprehensive performance with the criterion of the overall heat transfer coefficient per unit pressure drop. Correlations on heat transfer and friction factor were also summarized in the end of this paper. Results indicate that the Regular Hexagonal Plate Heat Exchanger has compact structure, flexible arrangement and good comprehensive performance. Analysis shows that spherical ribs can increase the local field synergy.