微通道换热器百叶窗翅片排水性能的CFD模拟

doi:10.11949/0438-1157.20201490

摘要/Abstract

摘要：

微通道换热器结构紧凑、换热效率高，但应用于热泵空调器时，会出现排水困难从而造成性能恶化的问题。插片式微通道换热器通过在翅片上增加专门的排水槽结构，能够有效提升微通道换热器的排水性能。本文采用百叶窗型插片式微通道换热器的双翅片扁管结构作为几何建模对象，利用液滴接触角模型与表面张力模型来确定排水过程中液滴在翅片表面的运动过程，建立排水预测模型，并通过试验验证模型准确性。通过对不同开缝角度和开缝数量的百叶窗翅片排水性能进行模拟，发现翅片上残留水量与开缝角度没有明显的单调关系；翅片上残留水量随着开缝数量增加而增加；当开缝数量由5个增加到14个时，残留水量增大了31.89%。

关键词: 插片式微通道换热器, 排水模型, 开缝角度, 开缝数量

Abstract:

Microchannel heat exchangers (MCHXs) have the advantages of compact structure and high heat transfer efficiency. However, the performance of MCHXs may deteriorate due to the difficulty in defrosting water drainage when MCHXs are applied to heat pump air conditioners. The louver fins used in inserted microchannel heat exchanger add a special structure of drainage channel, which can improve the drainage performance of microchannel heat exchanger. In this paper, the structure of tubes with two-row fins is selected as the modelling object. The contact angle model of water droplets and the surface tension model are developed to predict the movement characteristic of water on the fin surface, and the proposed model is validated by the experiments. The simulation results show that, the effect of louver angle of the fins on the mass of retaining water is not obvious; the mass of retaining water increases with the increase of the louver number of the fins, and the water retention mass increases up to 31.89% as the louver number increases from 5 to 14.

Key words: inserted microchannel heat exchanger, water drainage model, louver angle, louver number

中图分类号:

TK 124

刘璐, 丁国良, 庄大伟, 杨艺菲, 杜心远. 微通道换热器百叶窗翅片排水性能的CFD模拟[J]. 化工学报, 2021, 72(S1): 91-97.

LIU Lu, DING Guoliang, ZHUANG Dawei, YANG Yifei, DU Xinyuan. CFD simulation of water drainage performance of louver-typed microchannel heat exchanger[J]. CIESC Journal, 2021, 72(S1): 91-97.

图/表 11

图1 微通道换热器结构对比

Fig.1 Comparison of microchannel heat exchanger structure

图2 插片式微通道换热器结构

Fig.2 Structure of inserted microchannel heat exchanger

图3 计算区域划分

Fig.3 Division of calculation zones

图4 网格独立性验证结果

Fig.4 Grid independence verification results

图5 排水试验台实物

Fig.5 Photo of drainage experimental rig

图6 百叶窗型插片式微通道换热器翅片结构

Fig.6 Structure of fins of louver-typed inserted microchannel heat exchanger

图7 试验与模拟结果对比

Fig.7 Comparison of experimental and simulation result

图8 翅片扁管结构

Fig.8 Schematic diagram of fin-tube structure

图9 微通道换热器单元水相分布云图

Fig.9 Water distribution of microchannel heat exchanger unit

图10 开缝角度对残留水质量的影响

Fig.10 Effect of louver angle on retention water mass

图11 开缝数量对残留水质量的影响

Fig.11 Effect of louver number on retention water mass

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