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Hydrodynamic Instabilities of Adhering Droplets Due to a Shear Flow in a Rectangular Channel
Author(s) -
Barwari Beawer,
Burgmann Sebastian,
Janoske Uwe
Publication year - 2019
Publication title -
chemie ingenieur technik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.365
H-Index - 36
eISSN - 1522-2640
pISSN - 0009-286X
DOI - 10.1002/cite.201800094
Subject(s) - mechanics , shear (geology) , materials science , viscosity , volume fraction , deformation (meteorology) , chemistry , composite material , physics
This paper reports on the hydrodynamic droplet instabilities of different sizes and viscosities due to shear forces in a rectangular channel. Water‐glycerine droplets of different volumes are investigated. A new and nonambiguous definition for the critical velocity of droplet detachment and a new mathematical correlation between the critical velocity v crit and the fluid properties are presented. The measurements show that v crit decreases with the droplet volume but at the same time the contour deformation increases. With increasing viscosity of the liquid droplet, i.e., higher glycerine mass fraction, the contour deformation becomes more prominent and an increase in v crit can be observed. With respect to the fluid properties and droplet volumes, three different motion patterns are detected.