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Rise speed of supercritical carbon dioxide spheres in aqueous surfactant solutions

Published online by Cambridge University Press:  01 February 2006

SHIGERU BANDO  and
FUMIO TAKEMURA
SHIGERU BANDO
Affiliation:
Department of Mechanical Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan
FUMIO TAKEMURA
Affiliation:
National Institute of Advanced Industrial Science and Technology 1-2-1 Namiki, Tsukuba, Ibaraki 305-8564, Japan
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Abstract

The rise speed of supercritical carbon dioxide spheres in aqueous surfactant solution was investigated experimentally. Decanonic acid was added to water as a surfactant, and then the rise speed of the CO$_{2}$ spheres was measured at pressures 5 MPa to 10 MPa and at temperatures 28 $^{\circ}$C to 40 $^{\circ}$C generating different phases of spheres, namely gas, liquid, and supercritical. The results revealed that gas bubbles and liquid droplets showed the same behaviour as a rising rigid sphere due to the adsorption of surfactant onto the surface of the spheres. In contrast, due to the absorption of surfactant into the spheres, the drag coefficient of spheres of supercritical fluid was lower than that of a rigid sphere and was similar to that of a fluid sphere with a moving boundary. This behaviour mainly occurred in the rising process of the spheres composed of supercritical CO$_{2}$.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 548 , 10 February 2006 , pp. 133 - 140
Copyright
© 2006 Cambridge University Press

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