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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

THREE-DIMENSIONAL SIMULATION OF BUBBLE GROWTH DYNAMICS FOR CIRCULAR AND SQUARE ORIFICE USING OPENFOAM®

Menaka Attmaja Ray
Indian Institute of Technology Kanpur, Kanpur-208016, India

Malay K Das
Department of Mechanical Engineering, Indian Institute of Technology Kanpur, Kanpur-208016, India

Abstract

The present study focuses on numerical simulation of air bubble growth and detachment in a vertical water column. The air bubble injected through a single orifice is acted upon by momentum influx, buoyancy and surface tension. Bubble detachment dynamics is studied and compared for circular and square shaped orifices, intending to capture the influence of momentum influx and orifice shape on the process. The Volume of Fluid (VOF) based multiphase solver of open source software OpenFOAM® is used to perform three-dimensional simulations. Simulations are carried out at higher capillary numbers (>10-3) to avoid the adverse effect of spurious currents associated with the VOF technique. The study captures the influence of orifice geometry on the dynamic features of the bubble. Furthermore, the temporal evolutions of vortical structures are captured using the Q-criterion. Vortical structures provide better insights on the vorticity generation outside and inside the bubble indicating the creation of low pressure zone around the bubble. Such low-pressure zones eventually cause flow of the liquid toward the neck of the bubble, facilitating the neck-pinching process leading to the bubble detachment. Present simulations also showed that bubble detaches quickly in case of square orifice as compared to circular orifice.

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