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TECHNICAL PAPERS

Thermal and Concentrational Maragoni Convection at Liquid∕Air Bubble Interface

[+] Author and Article Information
Konstantin Kostarev, Andrew Zuev

 Institute of Continuous Media Mechanics UB RAS, Acad Korelev Str. 1, 614013 Perm, Russia

Antonio Viviani

Dipartimento di Ingegneria Aerospaziale e Meccanica,  Seconda Università di Napoli, Via Roma 29, 81031 Aversa ItalyAntonio.viviani@unina2.it

J. Appl. Mech 73(1), 66-71 (Apr 18, 2005) (6 pages) doi:10.1115/1.1991866 History: Received June 24, 2004; Revised April 18, 2005

The paper presents the experimental study of thermo- and solutocapillary Marangoni convection around a gas bubble in an inhomogeneous fluid with a vertical thermal or surfactant concentration gradient. The stationary bubble in the form of a short horizontal cylinder with a free lateral surface was placed into a vertically oriented thin liquid layer (Hele-Shaw cell). The evolution of thermal and concentration fields and fluid flows was studied applying the interferometric method. In contrast to a thermocapillary convection representing a stationary flow and stable temperature distribution, the periodic concentration disturbances around the bubble were observed in the solutocapillary case. The regularities of the discovered effect were revealed, and its interpretation was proposed.

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Copyright © 2005 by American Society of Mechanical Engineers
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Figures

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Figure 3

Solutocapillary convection: (a) interference pattern; (b) concentration distribution far from (1) and near (2) the bubble. Concentration gradient 0.9%∕mm.

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Figure 4

Interferograms of concentration distribution: (a) t=0.2min; (b) t=1.8min; (c) t=60.0min; (d) t=60.3min. Initial concentration gradient 2.5 %∕mm.

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Figure 5

Interferograms of concentration distribution: (a) t=60min; (b) t=180min

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Figure 6

Variation of concentration far from the bubble with vertical coordinate at time moments 0 min (1), 60 min (2) and 180 min (3)

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Figure 7

Variation of concentration difference between bubble upper and lower poles with time

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Figure 8

Variation of concentration field oscillation period around the bubble with time

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Figure 9

Variation of oscillation frequency, referred to the concentration difference at bubble poles, with time

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Figure 2

Thermocapillary convection: (a) interference pattern; (b) temperature distribution far from (1) and near (2) the bubble. Temperature gradient 1.2°C∕mm.

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Figure 1

Experimental setup

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