Numerical and Experimental Study of Heat Transfer Enhancement Based on the Structure of Cooling-Channels With Dimples

ZHANG Di; GUO Shuai; XIE Yong-hui

doi:10.3879/j.issn.1000-0887.2014.03.003

Volume 35 Issue 3

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Article Navigation > Applied Mathematics and Mechanics > 2014 > 35(3): 254-263

ZHANG Di, GUO Shuai, XIE Yong-hui. Numerical and Experimental Study of Heat Transfer Enhancement Based on the Structure of Cooling-Channels With Dimples[J]. Applied Mathematics and Mechanics, 2014, 35(3): 254-263. doi: 10.3879/j.issn.1000-0887.2014.03.003

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Numerical and Experimental Study of Heat Transfer Enhancement Based on the Structure of Cooling-Channels With Dimples

doi: 10.3879/j.issn.1000-0887.2014.03.003

School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, P.R.China

Received Date: 2013-09-20
Rev Recd Date: 2013-12-12
Publish Date: 2014-03-15

Abstract

Abstract

The dimple has bright prospect in the micro heat exchanger for smaller flow resistance and better heat transfer enhancement characteristics. Numerical and experimental study of heat transfer enhancement based on the structure of cooling rectangular channels with dimples was carried out. The flow structure and heat transfer characteristics in laminar air flow with different dimple depths and different Reynolds numbers were investigated, and the results were compared with those of the corresponding flat cases. The results show that: with the increasing Reynolds number, the heat transfer effect gradually increases; there exists the best dimple depth between 1 mm and 2 mm at the 3 Reynolds numbers (Re=500,1 000, 1 500); the flow separation occurs inside the dimple and the separation point is located in front of the dimple center, which results in the best heat transfer characteristics; at the same Reynolds number, the resistance characteristics decrease with the increasing dimple depth, and the thermal performance decreases with the increasing Reynolds number.
- dimple,
- heat transfer,
- numerical simulation,
- experiment

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References

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