Drag coefficient of a gas bubble in an axisymmetric shear flow

1994 ◽  
Vol 6 (9) ◽  
pp. 3186-3188 ◽  
Author(s):  
S. Takagi ◽  
A. Prosperetti ◽  
Y. Matsumoto
Keyword(s):  
Shear Flow ◽  
Drag Coefficient ◽  
Gas Bubble ◽  
Axisymmetric Shear

Shear Flow of a Viscous Fluid over a Cavity with a Pulsating Gas Bubble

2020 ◽  
Vol 65 (7) ◽  
pp. 242-245
Author(s):  
A. I. Ageev ◽  
A. N. Osiptsov
Keyword(s):  
Shear Flow ◽  
Viscous Fluid ◽  
Gas Bubble

The Effect of Shear Flow and Dissolved Gas Diffusion on the Cavitation in a Submerged Journal Bearing

2000 ◽  
Vol 123 (3) ◽  
pp. 494-500 ◽  
Author(s):  
M. Groper ◽  
I. Etsion
Keyword(s):  
Mass Transfer ◽  
Shear Flow ◽  
Mass Transport ◽  
Transport Mechanism ◽  
Journal Bearing ◽  
Gas Diffusion ◽  
Gas Bubble ◽  
Dissolved Gas ◽  
Rotating Shaft ◽  
Mass Transfer Mechanism

Two possible, long standing speculated mechanisms are theoretically investigated in an attempt to understand previous experimental observations of pressure build up in the cavitation zone of a submerged journal bearing. These mechanisms are (1) the shear of the cavity gas bubble by a thin lubricant film dragged through the cavitation zone by the rotating shaft and (2) the mass transfer mechanism which dictates the rate of diffusion of dissolved gas out of and back into the lubricant. A comparison with available experimental results reveals that while the cavitation shape is fairly well predicted by the “shear” mechanism, this mechanism is incapable of generating the level of the experimentally measured pressures, particularly towards the end of the cavitation zone. The “mass transport” mechanism is found inadequate to explain the experimental observations. The effect of this mechanism on the pressure build up in the cavitation zone can be completely ignored.

A note on the drag coefficient of a single gas bubble in a power-law fluid

1999 ◽  
Vol 77 (4) ◽  
pp. 766-768 ◽  
Author(s):  
Denis Rodrigue ◽  
Daniel De Kee ◽  
Chen Feng Chan Man Fong
Keyword(s):  
Drag Coefficient ◽  
Power Law ◽  
Gas Bubble ◽  
Power Law Fluid

Axisymmetric shear flow over spheres and spheroids

AIAA Journal ◽  
1986 ◽  
Vol 24 (4) ◽  
pp. 630-634 ◽  
Author(s):  
Arthur Rubel
Keyword(s):  
Shear Flow ◽  
Axisymmetric Shear

scholarly journals Determination of a Bubble Drag Coefficient during the Formation of Single Gas Bubble in Upward Coflowing Liquid

Processes ◽  
2020 ◽  
Vol 8 (8) ◽  
pp. 999
Author(s):  
Przemysław Luty ◽  
Mateusz Prończuk
Keyword(s):  
Drag Coefficient ◽  
Chemical Engineering ◽  
Liquid Velocity ◽  
Bubble Diameter ◽  
Bubble Formation ◽  
Hydraulic Drag ◽  
Gas Bubble ◽  
Flowing Liquid ◽  
Engineering Research

Bubble flow is present in many processes that are the subject of chemical engineering research. Many correlations for determination of the equivalent bubble diameter can be found in the scientific literature. However, there are only few describing the formation of gas bubbles in flowing liquid. Such a phenomenon occurs for instance in airlift apparatuses. Liquid flowing around the gas bubble creates a hydraulic drag force that leads to reduction of the formed bubble diameter. Usually the value of the hydraulic drag coefficient, cD, for bubble formation in the flowing liquid is assumed to be equal to the drag coefficient for bubbles rising in the stagnant liquid, which is far from the reality. Therefore, in this study, to determine the value of the drag coefficient of bubbles forming in flowing liquid, the diameter of the bubbles formed at different liquid velocity was measured using the shadowgraphy method. Using the balance of forces affecting the bubble formed in the coflowing liquid, the hydraulic drag coefficient was determined. The obtained values of the drag coefficient differed significantly from those calculated using the correlation for gas bubble rising in stagnant liquid. The proposed correlation allowed the determination of the diameter of the gas bubble with satisfactory accuracy.

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