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International Heat Transfer Conference 12

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

Dynamics of a bump of the gas-liquid interface on which a submerged liquid jet impinges

Kunio Kataoka
Department of Chemical Science and Engineering Kobe University Rokkodai, Nada, Kobe 657-8501, JAPAN

Jianxing Zheng
Department of Chemical Science and Engineering Kobe University Rokkodai, Nada, Kobe 657-8501, JAPAN

Tokuo Yoshimura
Department of Chemical Science and Engineering Kobe University Rokkodai, Nada, Kobe 657-8501, JAPAN

Naoto Ohmura
Department of Chemical Science and Engineering Kobe University, Rokkodai, Nada, Kobe 657-8501, JAPAN

DOI: 10.1615/IHTC12.3000
6 pages

Résumé

A quake motion of a liquid bump formed due to a submerged liquid jet impinging on a gas-liquid interface was analyzed from a viewpoint of the surface-renewal effect on interphase heat/mass transfer. Sequential video images of a liquid bump were processed to evaluate dynamics of the liquid bump quaking not only vertically but also transversely. Velocity fluctuations were also measured within the liquid bump as well as beneath the interface. The height and width (diameter) of the bump were correlated with the nozzle-to-interface distance and the jet Reynolds number. When the nozzle-to-interface distance was smaller than seven nozzle diameters, two characteristic frequencies of swelling and fluttering oscillations were determined definitely by a spectral analysis. When the nozzle-to-interface distance was larger than seven nozzle diameters, a characteristic time scale was also determined definitely by a wavelet analysis with the aid of logarithmic expectation. It has been concluded that the characteristic frequency of surface renewalmotion comes from the phase velocity andwavelength of the large-scale coherent structures convected downstream in the shear layer of an approach jet.

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