Research Papers: Jets, Wakes, and Impingement Cooling

Heat Transfer Characteristics of a Swirling Laminar Impinging Jet

[+] Author and Article Information
Koichi Ichimiya

Mechanical Systems Engineering Division, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Takeda-4, Kofu, Yamanashi 400-8511, Japanichimiya@yamanashi.ac.jp

Koji Tsukamoto

 Yamaha Marine Co. Ltd., 1400 Nippashi, Hamamatsu, Shizuoka 432-8528, Japan

J. Heat Transfer 132(1), 012201 (Oct 29, 2009) (5 pages) doi:10.1115/1.3211870 History: Received December 04, 2008; Revised May 20, 2009; Published October 29, 2009

This paper describes the characteristics of the heat transfer and flow of a swirling laminar impinging jet in a comparatively narrow space with a confined wall. Air is impinged on a flat surface with constant wall temperature. The heat transfer and flow field were analyzed numerically by solving three-dimensional governing equations. Heat transfer experiment and flow visualization were also performed. Numerical heat transfer was compared with experimental results. Temperature distribution and velocity vectors in the space were obtained for various swirl numbers at Reynolds number Re=2000. The numerical and experimental results show that the swirling jet enhances or depresses the local heat transfer, and the average Nusselt number ratio with and without swirl takes a peak at a certain swirl number.

Copyright © 2010 by American Society of Mechanical Engineers
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Figure 1

Coordinate system

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Figure 2

Experimental apparatus: (a) a schematic diagram and (b) two-inserting nozzles for swirl generation

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Figure 3

Velocity vector (Sw=1.186)

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Figure 4

Velocity vector and temperature distribution across the section (Sw=1.186)

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Figure 5

Flow visualization (Sw=1.08) (a) swirl flow at the nozzle exit and (b) flow across the flow passage

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Figure 6

Isothermal lines (Sw=1.186)

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Figure 7

Local Nusselt number (numerical calculation) (Sw=1.186)

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Figure 8

Local Nusselt umber (experiment) (Sw=1.08)

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Figure 9

Peripherally averaged Nusselt number (numerical calculation)

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Figure 10

Peripherally averaged Nusselt number (experiment)

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Figure 11

Average Nusselt number ratio




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