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Research Papers: Jets, Wakes, and Impingment Cooling

The Experimental Investigation of Impinging Heat Transfer of Pulsation Jet on the Flat Plate

[+] Author and Article Information
Yuan-wei Lyu, Yong Shan, Xiao-ming Tan

College of Energy and Power Engineering,
Nanjing University of Aeronautics
and Astronautics,
Nanjing 210016, China

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
e-mail: zhangjz@nuaa.edu.cn

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received February 7, 2018; final manuscript received August 3, 2018; published online September 25, 2018. Assoc. Editor: Amy Fleischer.

J. Heat Transfer 140(12), 122202 (Sep 25, 2018) (11 pages) Paper No: HT-18-1076; doi: 10.1115/1.4041183 History: Received February 07, 2018; Revised August 03, 2018

A series of tests were performed for the pulsating jet impingement heat transfer by varying the Reynolds number (5000 ≤ Re ≤ 20,000), operation frequency (10 Hz ≤ f ≤ 25 Hz), and dimensionless nozzle-to-surface distance (1≤H/d≤8) while fixing the duty cycle (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; 10 Hz ≤ f ≤ 20 Hz and Sr(H/d) ≥ 0.04; H/d ≥ 6 and most of current Sr(H/d). While under such conditions, 7500 ≤ Re ≤ 15,000 and Sr(H/d) ≤ 0.02; f ≥ 20 Hz 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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Figures

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Fig. 1

Experimental system of pulsating jet impingement heat transfer: (a) experimental system and (b) instantaneous velocity at nozzle outlet for steady jet and pulsating jet (f = 20 Hz) under Re = 10,000

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Fig. 2

Schematic of heat flux balance analysis

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Fig. 3

NuL_Average versus R/d curves for steady jet impingement at Re = 5000

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Fig. 4

Nu versus R/d curves for pulsating jet at f = 25 Hz and steady jet under Re = 20,000 and H/d = 2

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Fig. 5

Nu versus R/d curves for pulsating jet at f = 20 Hz and steady jet under Re = 10,000 and H/d = 6

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Fig. 6

Nu versus R/d curves for pulsating jet at f = 10 Hz and steady jet under Re = 5000 and H/d = 8

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Fig. 7

Effect of operational frequency on astag under H/d = 4 and H/d = 8: (a) H/d =4 and (b) H/d = 8

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Fig. 8

Effect of operational frequency on astag under Re = 10,000 and Re = 20,000: (a) Re = 10,000 and (b) Re = 20,000

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Fig. 9

Effect of jet Reynolds number on astag at f = 10 Hz and f = 20 Hz: (a) f = 10 Hz and (b) f = 20 Hz

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Fig. 10

Effect of jet Reynolds number on astag under H/d = 4 and H/d = 8: (a) H/d = 4 and (b) H/d = 8

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Fig. 11

Effect of nozzle-to-surface distance on astag at f = 10 Hz and f = 20 Hz: (a) f = 10 Hz and (b) f = 20 Hz

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Fig. 12

Effect of nozzle-to-surface distance on astag under Re = 10,000 and Re = 20,000: (a) Re = 10,000 and (b) Re = 20,000

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Fig. 13

Distributions of astag basing on three identifications: (a) Sr(H/d) versus Re, (b) Sr(H/d) versus f, and (c) Sr(H/d) versus H/d

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Fig. 14

Distributions of aav-R=4d basing on three identifications: (a) Sr(H/d) versus Re, (b) Sr(H/d) versus f, and (c) Sr(H/d) versus H/d

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