LAUSR

Three-dimensional bubble dynamics in rotating flow under an accelerating field such as a centrifugal one is studied in this work. We employ the lattice Boltzmann method in two phase flows to simulate bubble dynamics for different Bond and Morton numbers of 0.1, 1, 10, and 100 and 0.001, 0.01, 0.1, 1, 10, and 100, respectively. Another dimensionless number named as dimensionless force, F*, which is the ratio of buoyancy force to centripetal force is defined to explain the dynamics of the bubbles. In this work, we consider 5×10−7≤F*≤5. The results show that bubbles in rotating flows have different kinds of motions such as spinning, rotating, and translating. Based on the ratios of the forces (dimensionless numbers) acting on the bubble, four different classes of bubble dynamics can be distinguished: (1) stationary spinal bubbles at the center of the rotating flow, (2) spinal bubbles with axial motion at the center of the rotating flow, (3) bubbles with upward spiral motion at an approximate constant radius close to the center of the rotating flow, and (4) bubbles with dominant upward motion.