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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.v24.i1.30
pages 67-87

OSCILLATING MENISCUS AND SLUGS IN A SQUARE CAPILLARY: A HYDRODYNAMIC STUDY

Ajay Tripathi
Department of Mechanical Engineering, Jaypee University of Engineering & Technology , A-B Road, Raghogarh, Guna (M.P.), India
S. K. Agrawal
Mechanical Engineering Department, Motilal Nehru National Institute of Technology, Allahabad (U.P.), India

要約

Improvements in fabrication capability have given rise to mini/micro systems for heat and mass transfer operations. These systems may involve single- as well as multiple-phase flow. Understanding the local hydrodynamics of uniform/oscillating menisci or air plug/liquid slug/Taylor bubble flow inside such systems (i.e., capillaries/channels) will help us in manipulating the performance parameters, which will further improve the efficiency of multiphase microsystems. The present work aims not only to study the interfacial contact line behavior of an oscillating single meniscus and liquid slug formed between different fluids, but also various hydrodynamic properties. An eccentric cam follower system has been fabricated to provide sinusoidal oscillations of the fluid in a square glass capillary having hydraulic diameter of 2.0 mm. Experiments are done with two different fluids, namely, deionized water and silicone oil. A high-speed CCD camera is used to take images of the oscillating meniscus. Contact angle measurements are carried out for water along the length of the capillary at different oscillating frequencies, ranging from 0.25 Hz to 0.75 Hz. Besides dynamic contact angle information, curvature values of the oscillating Taylor front, film thickness, and pinning effect were observed for these fluids.

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