Spark-generated bubble near an elastic sphere |
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| Institution: | 1. NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, 28 Medical Drive, Singapore 117456, Singapore;2. Institute of High Performance Computing, A*STAR, 1 Fusionopolis Way, Singapore 138632, Singapore;3. Department of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117576, Singapore;1. Department of Mechanical Engineering, National University of Singapore, Kent Ridge, Singapore 119260, Singapore;2. Indian Institute of Technology, Hyderabad, Kandi, Sangareddy, 502285, India;3. Institute of High Performance Computing, 1 Fusionopolis Way, #16-16 Connexis, Singapore 138632, Singapore;1. Physics of Fluids Group, Max-Planck Center for Complex Fluid Dynamics, MESA+ Research Institute, J.M. Burgers Center for Fluid Dynamics, Department of Science & Technology, University of Twente, P.O. Box 217, 7500 AE Enschede, Netherlands;2. College of Shipbuilding Engineering, Harbin Engineering University, 145 Nantong Street, Harbin 150001, China;3. Department of Mechanical Engineering, University of Houston, TX 77204-4006, USA;4. Max Planck Institute for Dynamics and Self-Organization, Am Fassberg 17, 37077 Göttingen, Germany |
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| Abstract: | The interaction between a spark-generated bubble and an elastic sphere is investigated. A spark-generated bubble is created at various distances horizontally away from a suspended elastic sphere made of silicone rubber or super absorbent polymer (of shear modulus of elasticity G of between 5 and 312 kPa), using a low-voltage spark discharge method. We observe pronounced deformation and elongation of the elastic sphere when the spark-bubble is generated very close to a sphere. This happens when the elastic sphere has a small modulus of elasticity and a small size ratio R’ between the bubble and the elastic sphere (i.e. the bubble and the sphere have similar radii). Numerical simulations are also conducted using a Boundary Element Method (BEM) model coupled with a Finite Element Method (FEM) solver. The simulation results compare well with the experimental data. The numerical model is then extended to study the effects of elasticity and experimental parameters, such as the dimensionless stand-off distance H’, and size ratio R’, on the degree of deformation of the elastic cell and the dynamics of the bubble. |
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