F304 HEAT TRASFER CHARACTERISTIC IN SEPARATED FLOWS CONTROLLED BY ACOUSTIC EXCITATION(Control of turbulent mixing process)

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概要

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• An experimental study has been conducted to investigate the heat/mass transfer and flow characteristics for flow over a backward-facing step and cavities with variable aspect-ratios. A naphthalene sublimation method is employed to measure the heat/mass transfer coefficients on the duct wall. Acoustic excitations are forced on the separated flow by means of a woofer speaker placed above the step edge for Strouhal numbers between 0.2 and 0.4. In the spectra of streamwise velocity fluctuations for the flow excited at St=0.2, a sharp peak appears at the forcing frequency. For the backward-facing step, the reattachment length of about 6.7H is reduced by about 0.7〜1.5H when the flow is forced by acoustic excitation. The peak Sherwood number in heat/mass transfer measurement is located about 1.1H upstream from the reattachment point. For the 10H cavity, the reattachment of separated flow, which is unclear for a natural case, is produced by acoustic excitation. For the 5H cavity, the turbulence intensity and heat/mass transfer coefficient in the recirculation region are somewhat enhanced.

• 一般社団法人日本機械学会の論文
• 2000-10-01

著者

• Kang Seung-Goo

  Department of Orthodontics, Osaka Dental University

• CHO HYUNG

  Department of Orthopedic Surgery, Good Samsun hospital

• Cho Hyung

  Department Of Mechanical Engineering Yonsei University

• Kang Seung-goo

  Department Of Mechanical Engineering Yonsei University

• Kang Seung-goo

  Department Of Orthodontics Osaka Dental University

• Lee Jinho

  Department Of Mechanical Engineering Yonsei University

• Joo Won-Gu

  Department of Mechanical Engineering, Yonsei University

• Joo Won-gu

  Department Of Mechanical Engineering Yonsei University

• Cho Hyung

  Department Of Mechanical Engineering

• Cho Hyung

  Department of Mechanical Engineering, Yonsei University

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