三角形布管方式下两种换热器传热与流阻性能研究

Performance Investigation of Heat Transfer and Flow Resistance in Two Kinds of Heat Exchangers of Tube Bundle Arrangement with Equilateral Triangles

采用CFD数值模拟方法和折流板换热器、帘式折流片换热器周期性全截面计算模型,对两种换热器在正三角形布管方式下的传热系数、阻力、综合性能随Re数的变化情况进行了数值研究.研究结果表明,两种换热器对应的换热系数和壳程压力损失均随Re数的增加而增大,折流板换热器的传热系数大于帘式折流片换热器,约是帘式折流片的1.32倍,但其阻力大幅高于帘式折流片换热器,是帘式折流片换热器的2.4倍左右,两种换热器的综合性能均随Re数的增大而下降,帘式折流片换热器的α/ΔΡ几乎是折流板换热器的2倍,体现了帘式折流片换热器在保持较高的传热效果的情况下,具有显著的流动减阻性能.

In this paper, CFD numerical simulation and periodic whole cross-ssection computation model of baffle-plate heat exchanger and shutter baffle heat exchanger which tube bundle arrangement with equilateral triangles are adopted to study the changes of the performance of heat transfer coefficient, flow resistance, com- prehensive performance with Re. The simulation results indicate that two kinds of heat exchangers＇ heat transfer coefficient and shell-side pressure loss increases with the increase of Re, baffle-plate heat exchanger＇ heat transfer coefficient is greater than shutter baffle heat exchanger, it is about 1.32 times larger than shutter baffle heat exchanger, but the pressure drop is much greater than shutter baffle heat exchanger, it is about 2.4 times larger than shutter baffle heat exchanger, their comprehensive performance decline with the increase of Re, ct/ Ap of shutter baffle is almost 2 times larger than baffle-plate heat exchanger, this reflects shutter baffle heat exchanger has significant flow drag reduction performance in the case of higher heat transfer.