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research-article

The Experimental Investigation of Impinging Heat Transfer of Pulsation Jet on Flat plate

[+] Author and Article Information
Yuanwei Lyu

College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
lvyuanwei@nuaa.edu.cn

Jing-zhou Zhang

Jiangsu Province Key Laboratory of Aerospace Power System, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China; Collaborative Innovation Center of Advanced Aero-Engine, Beijing, 100191, China
zhangjz@nuaa.edu.cn

Yong Shan

College of Energy and Power, Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
nuaasy@nuaa.edu.cn

Xiao-ming Tan

College of Energy and Power, Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
txmyy@nuaa.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4041183 History: Received February 07, 2018; Revised August 03, 2018

Abstract

A series of tests were performed for the pulsating jet impingement heat transfer by varying the Reynolds number (5000?Re?20000), operation frequency (10Hz<=f<=25Hz) and dimensionless nozzle-to-surface distance (1?H/d?8) while fixing the duty cycle at DC=0.5(280 measurement data in total). Specific attention was paid to examine the relationship between the pulsating jet impingement and the steady jet impingement. By using a modified Strouhal number (Sr(H/d)), the test data are analyzed according to three classifications of the enhancement factors a=Nupulsation jet/Nusteady jet (such as a=?(Min,0.899), a?(0.95, 1.049) and a?(1.1, Max)). The results show that the identification of pulsating jet impingement in related to the steady jet impingement is suitable by using the modified Strouhal number (Sr(H/d)). Within the scope of this study, the most possibilities for the heat transfer enhancement by using pulsating jet impingement are suggested as the following conditions: Re<=7500 and Sr(H/d)>=0.04, Re>=17500 and 0.01<=Sr(H/d)<=0.03; 10Hz<=f<=20Hz and Sr(H/d)>=0.04; H/d>=6 and most of current Sr(H/d). While under such conditions, 7500<=Re<=15000 and Sr(H/d)<=0.02; f>=20Hz and Sr(H/d)>=0.04; H/d<=2 and Sr(H/d)<=0.02, the pulsating jet impingement makes the heat transfer weaker than the steady jet impingement more obviously.

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