Experiments are performed to study (a) slot air jet impingement cooling flow and (b) the heat transfer under acoustic excitations. Both flow visualization and spectral energy evolution measurements along the shear layer are made. The acoustic excitation at either inherent or noninherent frequencies can make the upstream shift for both the most unstable waves and the resulting vortex formation and its subsequent pairing processes. At inherent frequencies the most unstable wave can be amplified, which increases the turbulence intensity in both the shear layer and the core and enhances the heat transfer. Both the turbulence intensity and the heat transfer increase with increasing excitation pressure levels Spl until partial breakdown of the vortex occurs. At noninherent frequencies, however, the most unstable wave can be suppressed, which reduces the turbulence intensity and decreases the heat transfer. Both the turbulence intensity and the heat transfer decreases with increasing Spl, but increases with increasing Spl when the excitation frequency becomes dominant. For excitation at high Reynolds number with either inherent or noninherent frequency, a greater excitation pressure level is needed to cause the enhancement or the reduction in heat transfer. During the experiments, the inherent frequencies selected for excitation are Fo/2 and Fo/4, the noninherent frequencies are 0.71 Fo, 0.75 Fo, and 0.8 Fo, the acoustic pressure level varies from 70 dB to 100 dB, and the Reynolds number varies from 5500 to 22,000.
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Impingement Cooling Flow and Heat Transfer Under Acoustic Excitations
C. Gau,
C. Gau
Institute of Aeronautics and Astronautics, National Cheng Kung University, Tainan, Taiwan 70101, Republic of China
e-mail: fh26gauc@mail.iaa.ncku.edu.tw
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W. Y. Sheu,
W. Y. Sheu
Institute of Aeronautics and Astronautics, National Cheng Kung University, Tainan, Taiwan 70101, Republic of China
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C. H. Shen
C. H. Shen
Institute of Aeronautics and Astronautics, National Cheng Kung University, Tainan, Taiwan 70101, Republic of China
Search for other works by this author on:
C. Gau
Institute of Aeronautics and Astronautics, National Cheng Kung University, Tainan, Taiwan 70101, Republic of China
e-mail: fh26gauc@mail.iaa.ncku.edu.tw
W. Y. Sheu
Institute of Aeronautics and Astronautics, National Cheng Kung University, Tainan, Taiwan 70101, Republic of China
C. H. Shen
Institute of Aeronautics and Astronautics, National Cheng Kung University, Tainan, Taiwan 70101, Republic of China
J. Heat Transfer. Nov 1997, 119(4): 810-817 (8 pages)
Published Online: November 1, 1997
Article history
Received:
September 6, 1996
Revised:
May 19, 1997
Online:
December 5, 2007
Citation
Gau, C., Sheu, W. Y., and Shen, C. H. (November 1, 1997). "Impingement Cooling Flow and Heat Transfer Under Acoustic Excitations." ASME. J. Heat Transfer. November 1997; 119(4): 810–817. https://doi.org/10.1115/1.2824187
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