Effect of viscoelasticity on stability of liquid curtain

•High speed visualization of breakup process of viscoelastic liquid curtains.•Retraction speed of a rim on a viscoelastic liquid sheet.•Critical Weber number for curtain breakup as a function of Trouton ratio.•Mechanisms by which liquid viscoelasticity stabilizes a liquid curtain. The effect of visc...

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Bibliographic Details
Published in:Journal of non-Newtonian fluid mechanics 2018-07, Vol.257, p.83-94
Main Authors: Mohammad Karim, Alireza, Suszynski, Wieslaw J., Griffith, William B., Pujari, Saswati, Francis, Lorraine F., Carvalho, Marcio S.
Format: Article
Language:English
Subjects:
Capillary
Capillary electrophoresis
Critical flow
Curtain stability
Flow velocity
Fluidity
Liquid film
Minimum flow
Molecular weight
Protective coatings
Stability
Viscoelastic liquids
Viscoelasticity
Viscosity
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Summary:•High speed visualization of breakup process of viscoelastic liquid curtains.•Retraction speed of a rim on a viscoelastic liquid sheet.•Critical Weber number for curtain breakup as a function of Trouton ratio.•Mechanisms by which liquid viscoelasticity stabilizes a liquid curtain. The effect of viscoelastic forces on the hole growth speed in a liquid curtain and on the critical flow rate below which a liquid curtain breaks was studied by high-speed visualization. Different Boger-like aqueous solutions were used as the viscoelastic liquids. The expansion of a hole initiated within the liquid curtain leads to the curtain breakup. The results show a strong stabilizing effect of the viscoelastic forces; the minimum flow rate for stable curtain falls drastically by adding small amounts of high molecular weight polymer. The results reveal that the mechanisms for the increased stability are that the initiation of the hole is delayed and the speed at which it expands is also reduced, as the viscoelastic forces become stronger.
ISSN:0377-0257
1873-2631
DOI:10.1016/j.jnnfm.2018.03.019