Velocity Evolution for the Coalescence of Two In-Line Bubbles Rising in Non-Newtonian Fluids |
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| Authors: | Chunying Zhu Shaobai Li Taotao Fu Youguang Ma |
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| Affiliation: | 1.State Key Laboratory of Chemical Engineering, Collaborative Innovation Center of Chemical Science and Engineering, School of Chemical Engineering and Technology,Tianjin University,Tianjin,China;2.College of Energy and Environment,Shenyang Aerospace University,Shenyang,China |
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| Abstract: | This study experimentally investigates velocity evolution for the coalescence of two in-line bubbles rising in non-Newtonian fluids by using a high speed camera. Due to the wake of the leading bubble and the shear-thinning effect of non-Newtonian fluids, the following bubble is accelerated to approach the leading bubble, leading to the coalescence of the two bubbles. Based on the Newton’s second law and Schlichting’s wake theory, a theoretical model was developed to estimate the instantaneous rising velocity of the following bubble in the coalescence process of the two bubbles. The predicted values by the present model showed a good agreement with the experimental data. |
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