Journal
APPLIED THERMAL ENGINEERING
Volume 160, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2019.113837
Keywords
Minichannel; Artificial activation cavity; Flow boiling; Direct metal laser sintering
Funding
- National Natural Science Foundation of China [21776096]
- Open Foundation of Guangdong Petrochemical Equipment Engineering and Technology Research Center [2017JJ517010]
- Project of Guangxi Colleges and Universities Key Laboratory Breeding Base of Coastal Mechanical Equipment Design [GXLH2O16ZD-04]
- Project of Manufacturing and Control & Internet + Advanced Manufacturing Engineering and Technological Research Center [2017QGZZ02]
- Basic Ability Improvement Project for Young and Middle-aged Teachers in Guangxi Universities [2019KY0471]
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In the present paper, flow boiling heat transfer characteristics of minichannel heat sinks with and without artificial activation cavities by Direct Metal Laser Sintering (DMLS) are experimentally investigated. Scanning Electron Micrograph (SEM) is used to characterize the heat sinks and found that artificial activation cavities can be effectively manufactured by DMLS. Flow visualization was performed using a high-speed video camera and found that a series of columnar bubbles were appeared at higher frequencies in the heat sinks with artificial activation cavity in comparison with heat sink without artificial activation cavities. And the average heat transfer coefficients of DMLS-2#, DMLS-3#, DMLS-4#, DMLS-5# (minichannel with artificial activation cavities) are 2.62, 2.27, 2.03, 2.34 times that of DMLS-1# (minichannel without artificial activation cavities) under the same conditions, respectively. The pressure drop for different heat sinks increases with the heat flux increasing at low heat flux conditions, and the pressure fluctuated intensively at high heat flux conditions. Meanwhile, Double Factors Variance Analysis is introduced to analyze the influence of the design parameters on heat transfer. Overall, artificial activation cavities qualitatively designed for enhancing heat transfer in mini channel heat sink by DMLS have achieved the expectation results.
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