Journal of Jilin University(Engineering and Technology Edition) ›› 2022, Vol. 52 ›› Issue (10): 2294-2299.doi: 10.13229/j.cnki.jdxbgxb20210490

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Flow heat transfer performance of microchannel low temperature heat exchanger

Zhen-jun XU1(),Hao WANG1,2,Yin-cheng WANG3,Nuo ZHANG2,Meng CHEN1,Qing-qing LI1   

  1. 1.College of Civil Engineering＆Architecture，Qingdao Agricultural University，Qingdao 266300，China
    2.Mechanical and Electrical Engineering，Qingdao Institute of Technology，Qingdao 266300，China
    3.School of Mechanical Engineering，Tianjin University of Commerce，Tianjin 300133，China
  • Received:2021-06-01 Online:2022-10-01 Published:2022-11-11

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Abstract:

Based on the perfomance of small volume and high heat exchange efficiency for the microchannel heat exchanger and widely use in the fields of microelectronics， industrial refrigeration， electric vehicle air conditioning and so on， the physical model and mathematical model of microchannel low temperature heat exchanger are established and solved in the paper. To reveal the flow and heat transfer performance of microchannel low-temperature heat exchanger with hydraulic diameter less than 1 mm， the effects of changing inlet velocity and different aspect ratio on the resistance pressure drop， wall temperature， channel outlet fluid temperature and friction coefficient of the heat exchanger are studied. The results show that the above parameters were obviously effected by different aspect ratios. The microchannel pressure drop increases with the increase of flow velocity， and the increasing trend of pressure drop increases. The wall temperature， channel fluid outlet temperature and friction coefficient decrease with the increase of flow velocity， and finally tend to be stable. The parameter values of the channel with aspect ratio of 4 are generally larger than those of the channel with aspect ratio of 1. The aspect ratio has a great impact on the heat transfer performance of the microchannel heat exchanger.

Key words: power engineering, engineering thermophysics, microchannel, inlet velocity, aspect ratio, low temperature heat exchanger

CLC Number: 

  • TB61

Table 1

Structural parameters of microchannel heat exchangers"

参 数正方形截面长方形截面
长×宽×高40 mm×4 mm×1 mm40 mm×4 mm×1 mm
通道数53
微通道宽0.5 mm0.25 mm
微通道长0.5 mm1 mm

Fig.1

Mesh sectioning profile of the overall mesh"

Fig.2

Mesh dissection of boundary layer meshes"

Fig.3

Effect of inlet flow rate on pressure drop in microchannels"

Fig.4

Effect of inlet flow rate on microchannel wall temperature"

Fig.5

Effect of inlet flow rate on fluid outlet temperature"

Fig.6

Influence of inlet flow rate on friction coefficient"

Fig.7

Effect of inlet flow rate on Reynolds number"

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