Buoyancy driven motion of a single droplet in another quiescent fluid was simulated by a Front-Tracking method. The rising velocity and the projected area of the droplet were obtained in spherical, ellipsoidal, and wobbling regimes. Form and skin drag forces were calculated by integrating pressure distribution and velocity profiles along the interface of the droplet. Drag coefficient was obtained from those values when the rising velocity reached the terminal velocity. The scaling for drag of a liquid droplet was compared with the theoretical model. When the viscosity of the droplets was lower than that of the surrounding fluid, the drag coefficients can be predicted by the model for the limiting case of gas bubbles. When the viscosity of the droplets was larger than that of the surrounding fluid, on the other hand, the drag coefficients can be predicted by the model when solid particles are assumed.
- Fluids Engineering Division
Computations of Buoyancy Driven Motion of a Single Droplet in Another Immiscible Liquid
Homma, S, & Yoshikawa, T. "Computations of Buoyancy Driven Motion of a Single Droplet in Another Immiscible Liquid." Proceedings of the ASME 2017 Fluids Engineering Division Summer Meeting. Volume 1C, Symposia: Gas-Liquid Two-Phase Flows; Gas and Liquid-Solid Two-Phase Flows; Numerical Methods for Multiphase Flow; Turbulent Flows: Issues and Perspectives; Flow Applications in Aerospace; Fluid Power; Bio-Inspired Fluid Mechanics; Flow Manipulation and Active Control; Fundamental Issues and Perspectives in Fluid Mechanics; Transport Phenomena in Energy Conversion From Clean and Sustainable Resources; Transport Phenomena in Materials Processing and Manufacturing Processes. Waikoloa, Hawaii, USA. July 30–August 3, 2017. V01CT16A006. ASME. https://doi.org/10.1115/FEDSM2017-69139
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