Deformation of a droplet passing through a contraction and expansion at intermediate to large Reynolds number is predicted numerically and compared with experimental observations. The effects of fluid properties, contraction geometry and flow behaviour is considered. The experiments were performed for silicon oil droplets in water moving through a contraction. Orifice and droplet diameter were of the order of millimetres. Contraction length and flow rate were varied, while the contraction ratio was kept constant (1:4). The droplets are stretched by the contraction, after which oscillations are observed on the interface. Observation of the systems indicated that a disintegration zone exists for droplets above a critical size. Numerical simulations were carried out using an axisymmetric Volume-of-Fluid (VOF) code. Simulations were carried out to match the experimental conditions as well as for a few different Reynolds and Weber numbers. Results showed qualitative agreement with experiments. The predictions indicate that vortices within the contraction are responsible for the capillary-like waves on the stretched droplet.
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ASME 2002 Joint U.S.-European Fluids Engineering Division Conference
July 14–18, 2002
Montreal, Quebec, Canada
Conference Sponsors:
- Fluids Engineering Division
ISBN:
0-7918-3615-0
PROCEEDINGS PAPER
Deformation of a Droplet Passing Through a Contraction
David S. Whyte,
David S. Whyte
University of Melbourne, Parkville, VIC, Australia
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Justin Cooper-White,
Justin Cooper-White
University of Melbourne, Parkville, VIC, Australia
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Malcolm Davidson,
Malcolm Davidson
University of Melbourne, Parkville, VIC, Australia
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Amanda Lundqvist,
Amanda Lundqvist
University of Melbourne, Parkville, VIC, Australia
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Peter Schaerringer
Peter Schaerringer
University of Melbourne, Parkville, VIC, Australia
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David S. Whyte
University of Melbourne, Parkville, VIC, Australia
Justin Cooper-White
University of Melbourne, Parkville, VIC, Australia
Malcolm Davidson
University of Melbourne, Parkville, VIC, Australia
Amanda Lundqvist
University of Melbourne, Parkville, VIC, Australia
Peter Schaerringer
University of Melbourne, Parkville, VIC, Australia
Paper No:
FEDSM2002-31134, pp. 773-779; 7 pages
Published Online:
February 24, 2009
Citation
Whyte, DS, Cooper-White, J, Davidson, M, Lundqvist, A, & Schaerringer, P. "Deformation of a Droplet Passing Through a Contraction." Proceedings of the ASME 2002 Joint U.S.-European Fluids Engineering Division Conference. Volume 1: Fora, Parts A and B. Montreal, Quebec, Canada. July 14–18, 2002. pp. 773-779. ASME. https://doi.org/10.1115/FEDSM2002-31134
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