微尺度方波射流冲击阵列的传热特性研究

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Abstract The heat transfer performances of the microjets array impingement were studied by numerical simulations. After validating the model, the effects of rectangular pulses were analyzed on heat transfer characteristics by adjusting the pulse parameters. Then, some reasons for using rectangular pulse jets to enhance the heat transfer were discussed by flow field analysis. All of the simulations show that, if the duty ratio of the pulses is 0.5, the heat transfer characteristics of the microjet array will be effectively enhanced when the meantime Reynolds number is increasing. The enhancement of heat transfer by the adjustment of frequency is highly dependent on the flow regime of the jets. In the proper frequency band, the heat transfer coefficient of turbulence flow can increase by 20%, and the coefficient of laminar flow can increase by 7.5%. Under rational conditions, rectangular pulses jets can strengthen the impact effects and the disturbance of vortex in the cavity, therefore, the microjet array can obtain better heat transfer performance.
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Key words： numerical simulation micro scale；impulse impact；heat transfer

Received: 19 September 2016 Published: 15 March 2018

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	LV Yuanzheng
	XIA Guodong
	CHEN Yongchang

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LV Yuanzheng,XIA Guodong,CHEN Yongchang. Heat transfer characteristics of the microjet array impingement driven by rectangular pulses[J]. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(6): 117-123.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2018/V37/I6/117

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