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Physics of Fluids
Buoyancy-driven single bubble behaviour in a vertical Hele-Shaw cell with various gap Reynolds numbers Re(h/d) 2 has been studied. Two gap thicknesses, h = 0.5 mm (Re(h/d) 2 = 1.0-8.5) and 1 mm (Re(h/d) 2 = 6.0-50) were used to represent low and high gap Reynolds number flow. Periodic shape oscillation and path vibration were observed once the gap Reynolds number exceeds the critical value of 8.5. The bubble behaviour was also numerically simulated by taking a two-dimensional volume of fluiddoi:10.1063/1.4903488 fatcat:u63dpwuxsjhhtkkadd4bly7x2q