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Multiphase Science and Technology
SJR: 0.183 SNIP: 0.483 CiteScore™: 0.5

ISSN 印刷: 0276-1459
ISSN オンライン: 1943-6181

Multiphase Science and Technology

DOI: 10.1615/MultScienTechn.v19.i4.10
pages 305-321

ON THE DEPOSITION RATE OF DROPLETS IN ANNULAR FLOW AROUND A FLOW OBSTACLE

Tomio Okawa
Department of Mechanical & Intelligent Systems Engineering The University of Electro-Communications 1-5-1, Chofugaoka, Chofu-shi, Tokyo 182-8585, Japan
Takayuki Fujita
Dept. of Mechanical Engineering, Osaka University, Osaka, Japan
Jun Minamitani
Dept. of Mechanical Engineering, Osaka University, Osaka, Japan
Isao Kataoka
Dept. of Mechanical Engineering, Osaka University, Osaka, Japan

要約

Measurement of the deposition rate of droplets in vertical upward annular flow was carried out using air and water as test fluids. The test section was a 5-mm-diameter circular tube, in which a small tube was placed concentrically to test the influence of the presence of a flow obstacle on the deposition rate of droplets. The local deposition rate of droplets was measured at the inlet and downstream of the obstacle section to investigate the mechanism of deposition augmentation caused by the flow obstacle. In contrast to the hypothesis used in available models for the obstacle effect, significant deposition augmentation was detected not only downstream, but also at the inlet of the obstacle section. Simple models for the local deposition rates of droplets around the flow obstacle were developed based on the present experimental results.


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