Numerical Simulation of Herringbone Plate Heat Exchanger with Pin-Fin Rows
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摘要: 设计了一系列具有不同尺寸扰流柱的人字形板式换热器, 基于COMSOL软件研究其传热效率。应用了冷热双通道模型, 并创新性的提出了在人字形纹波中间添加空心的扰流柱。通过数值模拟方法研究了冷热双通道模型中的多物理场(流体流动和温度)。仿真结果表明, 扰流柱可以减小通道两侧速度较小的流动区域, 从而使温度传递更加均匀。此外, 内置扰流柱的通道出口处的压力损失很小。为了进一步降低压力损失, 可以在出口处不设置扰流柱。同时, 与传统板片相比, 内置扰流柱板片可将传热效率提高3%。Abstract: A series of plate heat exchangers with different sizes of pin-fin rows were designed to study their heat transfer efficiency with the COMSOL software. The hot and cold dual-channel model is applied and hollow pin-fin rows are innovatively added to ripples. Multiphysics (fluid flow and temperature) in the hot and cold dual-channel model is studied by numerical simulation method. The simulation results show that at a slow speed, the pin-fin rows can reduce the area on both sides of the channel, thus transferring the temperature more uniformly. Furthermore, the pressure at the outlet of the channel with the pin-fin rows did not change much. To reduce pressure loss, the pin-fin rows should not be installed at the outlet. The simulation results also show that the pin-fin rows can increase the heat transfer efficiency by 3% compared with the traditional plate.
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表 1 板片的物理结构参数
结构参数 板片类型 M A B C D 波纹高度R/mm 3.5 3.5 3.5 3.5 3.5 波纹间距S/mm 35 35 35 35 35 波纹倾角α/(°) 32 32 32 32 32 扰流柱直径D/mm 0 2 4 6 8 
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表 2 两种板片的出入口温度
K M型 A型 B型 C型 D型 热通道 入口 372.83 372.82 372.82 372.82 372.81 出口 334.86 335.59 335.18 333.98 333.31 冷通道 入口 293.68 293.69 293.68 293.67 293.67 出口 334.29 333.64 333.82 334.63 335.07
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表 3 不同换热器的参数
换热器类型 出入口 V/(m·s-1) α/(W·(m2·K)-1) M型 热 0.5 17 650 冷 0.5 13 550 C型 热 0.5 18 508 冷 0.5 16 205 枕式板式
换热器热 1.87 18 050 冷 1.15 13 940
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