Journal of the Korean Society of Manufacturing Process Engineers (한국기계가공학회지)

The Korean Society of Manufacturing Process Engineers (한국기계가공학회)
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Effect of Thermal Contact Resistence on the Heat Transfer Characteristics of Air Flow around the Finned Micro-Channel Tube for MF Evaporator

Micro-Channel형 열교환기에 부착된 핀의 열접촉저항이 열전달 특성에 미치는 영향

  • Received : 2021.09.05
  • Accepted : 2021.09.23
  • Published : 2021.11.30
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Abstract

In this study, the effect of thermal contact resistance between pin-channel tubes on the heat transfer characteristics was analytically examined around the channel tubes with the pins attached to two consecutive arranged channel pipes. The numerical results showed that the heat transfer coefficient decreased geometrically as the thermal contact resistance increased, and the corresponding temperature change on the contact surface increased as the thermal contact resistance increased. The thinner the pin, the more pronounced the geometric drop in the heat transfer coefficient. It was confirmed that the higher the height of the pin, the higher was the heat transfer coefficient, however, the greater the size of the thermal contact resistance, the smaller was the heat transfer coefficient. It was found that the temperature change in the inner wall of the channel tube did not significantly affect the heat transfer characteristics owing to the thermal contact resistance. Furthermore, the velocity of air at the entrance of the channel tube was proportional to the heat transfer coefficient due to a decrease in the convective heat resistance corresponding to an increase in the flow rate.

Keywords

Acknowledgement

본 과제(결과물)는 2021년도 교육부의 재원으로 한국연구재단의 지원을 받아 수행된 지자체-대학협력기반 지역혁신 사업의 결과입니다.

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