The Dynamics of Gas Bubbles in a Co-Flowing Liquid Ambience
I. Chakrabortya, G. Biswasb and P. S. Ghoshdastidarc
Department of Mechanical Engineering, Indian Institute of Technology Kanpur, Kanpur 208 016, India.
aindrac@iitk.ac.in
bgtm@iitk.ac.in
cpsg@iitk.ac.in
ABSTRACT
In this work, a numerical simulation study of the problem of dynamic bubble formation from a submerged orifice in an immiscible coflowing ambient liquid stream, under constant gas inflow condition is presented. The full cycle, from formation to detachment of bubbles and the corresponding bubble dynamics is simulated numerically by using coupled level-set and volume-of-fluid (CLSVOF) method. This method is applied to track the movement of the interface between the two immiscible fluids dictated by surface tension force. This numerical method solves a single set of Navier-stokes equations for both phases by using finite-difference formulation on a fixed Eulerian two-dimensional axisymmetric coordinate mesh. In this study, the primarily focus is on single periodic bubble formation dynamics. The effect of liquid and gas flow rates and surface tension on the bubble dynamics, bubble size and bubble formation frequency is investigated. It is observed that the size of the bubble decreases with decreasing gas flow rate and with increasing liquid flow rate.
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