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Numerical study on the deformation of a gas bubble in uniform flow

Ocean Engineering, ISSN: 0029-8018, Vol: 254, Page: 111164
2022
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The deformation of a gas bubble in uniform flow is numerically investigated using a dynamic body force method. In our parametric range, bubble steady shape is the superposition of two types of deformation: O-type deformation (corresponding to oblate eccentricity) and D-type deformation (corresponding to fore-aft symmetry). The calculation results show that O-type deformation mainly depends on surface tension, so the aspect ratio is mainly correlated with We ( ρldeUslip2/σ ). D-type deformation is mainly depends on the competition between pressure and viscous normal stress on bubble surface. Therefore, bubble fore-aft symmetry has a more significant correlation with Re ( ρldeUslip/μl ). We find that the critical Re of fore-aft symmetry slightly increases as We increases, and the interval of critical Re becomes narrower. When We exceeds 7, bubble will loss its fore-aft symmetry. A new power-law correlation of aspect ratio related to We and a phase diagram of bubble symmetry mapped to Re – We are given to predict bubble shape.

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