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- W2089025819 abstract "Abstract The effects of co-current flows on a rising Taylor bubble are systematically investigated by a front tracking method coupled with a finite difference scheme based on a projection approach. Both the upward (the co-current flows the same direction as the buoyancy force) and the downward (the co-current moves in the opposite direction of the buoyancy force) co-currents are examined. It is found that the upward co-current tends to elongate the bubble, while the downward co-current makes the bubble fatter and shorter. For large Nf (the inverse viscosity number), the upward co-current also elongates the skirted tail and makes the tail oscillate, while the downward co-current shortens the tail and even changes a dimpled bottom to a round shape. The upward co-current promotes the separation at the tail, while the downward co-current suppresses the separation. The terminal velocity of the Taylor bubble rising in a moving flow is a linear combination of the mean velocity (UC) of the co-current and the terminal velocity (U0) of the bubble rising in the stagnant liquid, and the constant is around 2 which agrees with the literature. The wake length is linearly proportional to the velocity ratio (UC/U0). The co-currents affect the distribution of the wall shear stresses near the bubble, but not the maximum." @default.
- W2089025819 created "2016-06-24" @default.
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- W2089025819 date "2011-10-01" @default.
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- W2089025819 title "Co-current flow effects on a rising Taylor bubble" @default.
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- W2089025819 doi "https://doi.org/10.1016/j.ijmultiphaseflow.2011.04.004" @default.
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