Effect of rheological properties of shear thinning liquids on curtain stability

•High speed visualization of breakup process of liquid curtains.•Critical Weber number for curtain breakup as a function of Ohnesorge number for shear thinning liquids.•Determination of a characteristic viscosity for the flow during curtain breakup process.•Guidance on how to change the viscosity cu...

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Bibliographic Details
Published in:Journal of non-Newtonian fluid mechanics 2019-01, Vol.263, p.69-76
Main Authors: Mohammad Karim, Alireza, Suszynski, Wieslaw J., Griffith, William B., Pujari, Saswati, Francis, Lorraine F., Carvalho, Marcio S.
Format: Article
Language:English
Subjects:
Breakup
Cosmetics industry
Curtains
Deformation
Flow velocity
Newtonian liquids
Rheological properties
Rheology
Shear thinning (liquids)
Shear viscosity
Stability
Viscosity
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Summary:•High speed visualization of breakup process of liquid curtains.•Critical Weber number for curtain breakup as a function of Ohnesorge number for shear thinning liquids.•Determination of a characteristic viscosity for the flow during curtain breakup process.•Guidance on how to change the viscosity curve to stabilize a liquid curtain. Recent results have shown that Newtonian liquid curtains become more stable as the viscosity rises. However, the effect of shear thinning rheology on the dynamics of curtain breakup is not well understood. The role of shear thinning behavior on liquid curtain stability was studied by high-speed visualization. The critical condition at the onset of curtain breakup was determined by identifying the flow rate below which the curtain broke. Curtain breakup was seen to begin with a hole initiated within the curtain. The results reveal that the dynamics of curtain breakup is governed by the shear viscosity at a characteristic deformation rate and, as in the Newtonian liquid case, the stability increases as the characteristic viscosity rises.
ISSN:0377-0257
1873-2631
DOI:10.1016/j.jnnfm.2018.11.009