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International Heat Transfer Conference 12

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

Shadowgraphic observation of surface waves on a water film falling inside a vertical tube and the associated gas absorption

Chang-Dae Park
Department of Mechanical and Systems Engineering, University of the Ryukyus, Nishihara, Okinawa 903-0213, Japan; School of Mechanical and Manufacturing Engineering, Korea Institute of Machinery and Materials 171 Jang-dong, Daejon 305-343, Korea

Takehiro Nosoko
Department of Mechanical Engineering, Keio University 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223, Japan; Department of Mechanical Engineering, University of the Ryukyus, Sembaru 1, Nishihara, Okinawa 903-01, JAPAN

Akio Miyara
Saga University, Honjo-machi, Saga-shi, Saga 840 – 0052, Japan; International Institute for Carbon – Neutral Energy Research, Kuyshu University, Fukuoka-shi, Japan

Takashi Nagata
Department of Mechanical Engineering, University of the Ryukyus, Sembaru 1, Nishihara, Okinawa 903-01, JAPAN

Sung Tack Ro
School of Mechanical and Aerospace Engineering, Seoul National University, Kwanak, Seoul, Korea

DOI: 10.1615/IHTC12.480
6 pages

要約

The dynamics and the associated gas absorption rates of naturally evolving and periodically triggered surface waves on water film falling inside a vertical tube have experimentally been investigated. It was found that the transition from laminar to turbulent flow occurs within Reynolds number range of 400 ∈ Re ∈ 700, along with a drastic increase in the Sherwood number Sh. Furthermore, a new transition was found to occur at Re ~ 40 in the laminar flow region, where the dynamics of waves significantly changes and a sudden decrease in the power n of the correlation Sh = CRen is observed.

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