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

ISSN Imprimir: 0276-1459
ISSN On-line: 1943-6181

Multiphase Science and Technology

DOI: 10.1615/MultScienTechn.v24.i3.40
pages 239-256

LENGTHS OF BUBBLE AND SLUG AND PRESSURE DROP IN GASLIQUID SLUG FLOW IN MICROCHANNELS

Akimaro Kawahara
Faculty of Advanced Science and Technology, Kumamoto University, Chuo-Ku, Kurokami 2-39-1, Kumamoto City, 860-8555, Japan
Michio Sadatomi
Department or Advanced Mechanical System, Graduate School of Science and Technology, Kumamoto University, Kurokami 2-39-1, Chuo-Ku, Kumamoto City, 860-8555, Japan
Satoshi Shimokawa
Graduate School of Science and Technology, Kumamoto University, Chuo-ku Kurokami 2-39-1, Kumamoto City, 860-8555, Japan

RESUMO

The characteristics of two-phase slug flow, i.e., bubble length and liquid slug length and pressure drop in horizontal circular and rectangular microchannels with T-junction-type gas−liquid mixer have been investigated. The inner diameter of the circular channel was 250 µm, and the hydraulic diameter of the rectangular one was 235 µm. In order to determine the effects of fluid properties, distilled water and aqueous solutions of ethanol having different mass concentrations of 49 and 100 wt% and HFE7200 were used as the test liquid, while nitrogen gas was used as the test gas. The bubble length data for circular and rectangular microchannels were well correlated with Sobieszuk et al.'s [Chem. Eng. Res. Des., vol. 88, pp. 263−269,2010] correlation. The ratio of the bubble length to bubble pitch, which is sum of the bubble length and the liquid slug length, could be correlated with the homogeneous void fraction, regardless of the channel geometries and the liquid properties. The two-phase pressure drop could be reasonably calculated with a unit cell model, except for flows with relatively larger capillary and Weber numbers.


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