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Research Papers: Jets, Wakes, and Impingment Cooling

Experimental Investigation of Impinging Heat Transfer of the Pulsed Chevron Jet on a Semicylindrical Concave Plate

[+] Author and Article Information
Yuan-wei Lyu, Xi-cheng Liu, Yong Shan

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 July 15, 2018; final manuscript received November 11, 2018; published online January 14, 2019. Assoc. Editor: Amy Fleischer.

J. Heat Transfer 141(3), 032201 (Jan 14, 2019) (15 pages) Paper No: HT-18-1447; doi: 10.1115/1.4042159 History: Received July 15, 2018; Revised November 11, 2018

Impinging heat transferred by a pulsed jet induced by a six-chevron nozzle on a semicylindrical concave surface is investigated by varying jet Reynolds numbers (5000 ≤ Re ≤ 20,000), operational frequencies (0 Hz ≤ f ≤ 25 Hz), and dimensionless nozzle-to-surface distances (1 ≤ H/d ≤ 8) while fixing the duty cycle as DC = 0.5. The semicylindrical concave surface has a cylinder diameter-to-nozzle diameter ratio (D/d) of 10. The results show that the nozzle-to-surface distance has a significant impact on the impingement heat transfer of the pulsed chevron jet. An optimal nozzle-to-surface distance for achieving the maximum stagnation Nusselt number appears at H/d  =  6. In the wall jet zone, the averaged Nusselt number is the largest at H/d = 2 and the smallest at H/d = 8. In comparison with the chevron steady jet impingement, the effect of nozzle-to-surface distance on the convective heat transfer becomes less notable for the pulsed chevron jet impingement. The stagnation Nusselt number under the pulsed chevron jet impingement is mostly less than that under the chevron steady jet impingement. However, at H/d = 8, the pulsed chevron jet is more effective than the steady jet. This study confirmed that the pulsed chevron jet produced higher azimuthally averaged Nusselt numbers than the steady chevron jet in the wall jet flow zone at large nozzle-to-surface distances. The stagnation Nusselt numbers by the pulsed chevron jet impingement have a maximum reduction of 21.0% (f = 20 Hz, H/d = 4, and Re = 2000) compared with that of the steady chevron jet impingement. Also, the pulsed chevron jet impingement heat transfer on a concave surface is less effective compared to a flat surface. The stagnation Nusselt numbers on the semicylindrical concave surface have a maximum reduction of about 37.7% (f = 20 Hz, H/d = 8, and Re = 5000) compared with that on the flat surface.

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Figures

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Fig. 1

Experimental system of the 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 diagram of the test section for concave surface

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Fig. 3

Schematic diagrams of the chevron nozzle and the concave target surface: (a) sectional view, (b) three-dimensional viewing, and (c) plane viewing

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Fig. 4

Comparison between the current test and Violato et al. [18] on the flat surface by the steady jet impingement at Re=5000

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Fig. 5

Local Nusselt number distribution under Re=10,000 and f =20 Hz: (a) H/d = 1, (b) H/d = 2, (c) H/d = 4, (d) H/d = 6, and (e) H/d = 8

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Fig. 6

Effect of the nozzle-to-surface distance on Nusselt number distribution under Re=10,000 and f =20 Hz: (a) local Nusselt number and (b) averaged Nusselt number

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Fig. 7

Local Nusselt number distribution under Re=10,000 and H/d =4: (a) f = 10 Hz, (b) f = 15 Hz, (c) f = 15 Hz, and (d) f = 25 Hz

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Fig. 8

Effect of operational frequency on averaged Nusselt number distribution under Re=10,000: (a) H/d = 2, (b) H/d = 4, (c) H/d = 6, and (d) H/d = 8

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Fig. 9

Local Nusselt number distribution under f =20 Hz and H/d =4: (a) Re = 5000, (b) Re = 10,000, (c) Re = 15,000, and (d) Re = 20,000

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Fig. 10

Effect of jet Reynolds number on averaged Nusselt number distribution under f =20 Hz: (a) H/d = 2, (b) H/d = 4, (c) H/d = 6, and (d) H/d = 8

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Fig. 11

Local Nusselt number distribution by steady jet impingement under Re=10,000: (a) H/d = 2, (b) H/d = 4, (c) H/d = 6, and (d) H/d = 8

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Fig. 12

Comparisons of the azimuthally averaged Nusselt number between the steady jet and the pulsed jet impingement: (a) Re = 5000, (b) Re = 10,000, (c) Re = 15,000, and (d) Re = 20,000

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Fig. 13

Local Nusselt number distribution on the flat surface by the pulsed jet impingement under Re=10,000 and f =20 Hz: (a) H/d = 2, (b) H/d = 4, (c) H/d = 6, and (d) H/d = 8

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Fig. 14

Comparisons of the azimuthally averaged Nusselt number between the flat surface and the concave surface impinged by the pulsed jet: (a) Re = 5000, (b) Re = 10,000, (c) Re = 15,000, and (d) Re = 20,000

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