Characteristics of Droplet Pinch-off in Liquid/Liquid Jet Systems
Natural and periodically forced jets of water/glycerin solution were examined as they flowed into an ambient of immiscible Dow Corning 200 fluid. The dynamics of jet pinch off was investigated for jet Reynolds numbers of order 50. Refractive index matching and laser induced fluorescence were employed to obtain clear images of the interface and the jet interior. Planar velocity fields were obtained by particle image velocimetry. The results showed that the pinch off mode, including whether or not satellites form, depends on the viscosity ratio, jet Reynolds number, and jet Strouhal number. Pinch off angles appear relatively insensitive to Reynolds and Strouhal number, but sensitive to the fluid viscosity ratio.
KeywordsParticle Image Velocimetry Nozzle Exit Strouhal Number Viscosity Ratio Satellite Formation
Unable to display preview. Download preview PDF.
- Bright, A. (1985) Minimum drop volume in liquid jet breakup. Chemical Engineering Research and Design. 63: 59–66.Google Scholar
- Longmire, E. K., Lowengrub, J. S. and Gefroh, D. L. (1999) A comparison of experiments and simulations on pinch-off in round jets. ASME FEDSM99–711, 3`d ASME/JSME Joint Fluids Engineering Conference, San Francisco.Google Scholar
- Milosevic, I.N. and Longmire, E.K. (2002) Pinch-off modes and satellite formation in liquid-liquid jet systems. International Journal of Multiphase Flow, to appear.Google Scholar
- Skelland, A. H. P. and Johnson, K. R. (1982) Jet break-up in liquid-liquid systems. Canadian Journal of Chemical Engineering.52:732–738.Google Scholar