自然科学版 英文版
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中南大学学报(英文版)

Journal of Central South University

Vol. 25    No. 4    April 2018

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Effect of surfactants on hydrodynamics characteristics of bubble in shear thinning fluids at low Reynolds number
LI Shao-bai(李少白), FAN Jun-geng(范俊赓), LI Run-dong(李润东), WANG Lei(王雷), LUAN Jing-de(栾敬德)

Liaoning Key Laboratory of Clean Energy and College of Energy and Environment, Shenyang Aerospace University, Shenyang 110136, China

Abstract:In this study, the effects of surfactants on the hydrodynamic characteristics of bubbles in shear-thinning fluids at low Reynolds number (Re<50) are investigated. The bubble terminal velocity and drag coefficient of bubble in clean and contaminated carboxymethylcellulose (CMC) solutions are obtained using a high-speed camera for examining differences. The results show that the existence of surfactant could reduce the terminal velocity of bubble at small volume (0.25wt% CMC: <100 mm3; 0.50wt% CMC: <110 mm3), attributed to stiffening the bubble interface. However, this negative effect decreases and finally disappears with increasing bubble volume. The drag coefficient curves of the bubble in contaminated CMC solution exhibit behavior similar to that exhibited by a solid sphere at Re<10, indicating that internal circulation flow is absent at the bubble interface as compared to that in clean CMC solution. However, for 10

 

Key words: surfactant; single bubble; shear thinning fluids; velocity; drag coefficient

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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