Please use this identifier to cite or link to this item: https://doi.org/10.1063/1.1640376
Title: Free-surface entrainment into a rimming flow containing surfactants
Authors: Thoroddsen, S.T. 
Tan, Y.-K.
Issue Date: Feb-2004
Source: Thoroddsen, S.T., Tan, Y.-K. (2004-02). Free-surface entrainment into a rimming flow containing surfactants. Physics of Fluids 16 (2) : L13-L16. ScholarBank@NUS Repository. https://doi.org/10.1063/1.1640376
Abstract: We study experimentally the free-surface entrainment of tubes into a steady rimming flow formed inside a partially filled horizontally rotating cylinder. The liquid consists of a glycerin-water mixture containing surfactants (fatty acids). The phenomenon does not occur without the surfactants and the details are sensitive to their concentration. The entrainment of numerous closely spaced air tubes and/or surfactant columns can start intermittently along a two-dimensional stagnation line, but is usually associated with the appearance of an axially periodic vortex structure, the so-called shark teeth, which fixes the spanwise location of these tubes. The number of tubes is governed by the three-dimensional shape of the free surface, reducing from more than 10 to only two in each trough, as the rotation rate is increased. The tubes vary in diameter from 10-30 μm and can extend hundreds of diameters into the liquid layer before breaking up into a continuous stream of bubbles and/or drops. The tubes are driven through the stagnation line by the strong viscous shear and are stretched in the downstream direction. The entrainment starts when the Capillary number Ca=μωR/σ≃0.4. © 2004 American Institute of Physics.
Source Title: Physics of Fluids
URI: http://scholarbank.nus.edu.sg/handle/10635/60371
ISSN: 10706631
DOI: 10.1063/1.1640376
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

SCOPUSTM   
Citations

11
checked on Dec 11, 2017

WEB OF SCIENCETM
Citations

14
checked on Dec 11, 2017

Page view(s)

22
checked on Dec 9, 2017

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.