Shapes of ellipsoidal bubbles in infinite stagnant liquids |
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| Institution: | 1. Department of Energy Engineering, Zhejiang University, Hangzhou 310027, China;2. Department of Energy Engineering, Co-Innovation Center for Advanced Aero-Engine, Zhejiang University, Hangzhou 310027, China;1. Department of Mechanical Engineering, MIT, Cambridge, MA 02139, USA;2. Department of Nuclear Science and Engineering, MIT, Cambridge, MA 02139, USA;1. Department of Mechanical Systems Engineering, University of Shiga Prefecture, 2500, Hassaka, Hikone, Shiga, Japan;2. Graduate School of Engineering, Kobe University, 1-1, Rokkodai, Nada, Kobe, Japan |
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| Abstract: | Aspect ratios E of ellipsoidal bubbles in infinite stagnant clean liquids are measured for log M = −6.6, −5.5, −4.9 and −3.9, where M is the Morton number. An empirical correlation of E applicable to a wide range of the Morton number is proposed by making use of the present data and Sugihara's data at log M = −11 (2007). The aspect ratio in this correlation is expressed in terms of the combination of the Eötvös number and the bubble Reynolds number to account for the effects of the inertial, viscous, buoyant and surface tension forces on E. Terminal velocities of ellipsoidal bubbles are accurately predicted by using the proposed correlation and a drag correlation proposed by Rastello et al. (2011). |
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