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Study of Bubble Bursting at Free Surface using Coupled Eulerian-Lagrangian Approach

Digvijay Singh
Department of Mechanical & Industrial Engineering, IIT Roorkee, Uttarakhand-247667, India

Arup Kumar Das
Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee 247667, India

DOI: 10.1615/IHMTC-2017.2970
pages 2121-2128

Abstract

Whenever a tiny bubble is trapped inside the water pool, density gradient drives upward motion of bubble. While upward moving bubble interacts with the free surface, abrupt changes in the interfacial properties which leads to bursting of bubble at the interface. Bubble burst ensuing cavity collapse, which results into the formation of high speed jet at its nadir. Upward moving jet disintegrates drops from the zenith which depart vertically and stroll as a cloud in the vicinity of interface. Present paper is accentuated in numerical study of a single punctured bubble of 1 mm in diameter placed at air/water interface using coupled Lagrangian point particle (LPP) and Eulerian based volume of fluid (VOF) framework. Temporal evolution in deformation of spherical bubble cavity to conical and high speed jet formation to droplet ejection are extensively investigated .Velocity vector contour is portrayed the physics behind the complex motion of surrounding fluid near the interface. Comparison of numerical results obtained using Coupled LLP-VOF and Eulerian based VOF framework. Further, numerical results are presented for six bubbles placed around the center bubble, ruptured at the free interface. Influence of neighboring bubble in formation of toroidal rim, bubble bursting which results into creation of seven high speed jets are reported. Drops disintegration and jet growth rate are investigated for center and surrounding jets. Velocity vector contour also presented to explore the nature of jet formation.

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