Interfacial shear viscosity at fluid-fluid interfaces

AIChE Journal ◽  
1971 ◽  
Vol 17 (6) ◽  
pp. 1287-1295 ◽  
Author(s):  
D. T. Wasan ◽  
Lalit Gupta ◽  
M. K. Vora
Keyword(s):  
Shear Viscosity ◽  
Interfacial Shear ◽  
Fluid Interfaces ◽  
Interfacial Shear Viscosity

Stress- and strain-controlled measurements of interfacial shear viscosity and viscoelasticity at liquid/liquid and gas/liquid interfaces

2003 ◽  
Vol 74 (11) ◽  
pp. 4916-4924 ◽  
Author(s):  
Philipp Erni ◽  
Peter Fischer ◽  
Erich J. Windhab ◽  
Victor Kusnezov ◽  
Heiko Stettin ◽  
...  
Keyword(s):  
Shear Viscosity ◽  
Interfacial Shear ◽  
Stress And Strain ◽  
Liquid Interfaces ◽  
Interfacial Shear Viscosity

Effect of Reaction of NaOH and Daqing Crude Oil on Oil/Water Interfacial Properties and Emulsion Stability

2013 ◽  
Vol 781-784 ◽  
pp. 2389-2395
Author(s):  
Jian Fang Jiang ◽  
Mei Qin Lin ◽  
Xue Qin Xu ◽  
Ming Yuan Li ◽  
Zhao Xia Dong
Keyword(s):  
Zeta Potential ◽  
Interfacial Tension ◽  
Crude Oil ◽  
Aqueous Phase ◽  
Shear Viscosity ◽  
Interfacial Shear ◽  
Oil Water ◽  
The Stability ◽  
Model Oil ◽  
Interfacial Shear Viscosity

The oil/water interfacial properties and the stability of the emulsion of ASP flooding in Daqing Oilfield were investigated with the measurement of interfacial tension, interfacial shear viscosity,Zeta potential and turbidity of the oil/water system. The results show that, after NaOH has reacted with Daqing crude oil for a long time, the interfacial tension between the aqueous phase and Daqing model oil decreases. The absolute value of the Zeta potential of the surface of oil droplets increases. The changes of the interfacial shear viscosity between the aqueous phase and the oil phase do not appear to be obvious. The stability of O/W emulsion formed by Daqing model oil and the aqueous phase is enhanced. After NaOH has reacted with crude oil for 1d, the interfacial tension between oil phase and simulated water, Zeta potential and the stability of the oil/water emulsion become higher than that of the emulsion without NaOH. However, after NaOH has reacted with crude oil for 10 d and 30 d, respectively, the interfacial tension between oil phase and simulated water, Zeta potential and the stability of the O/W emulsion are lower than that of the emulsion with the same reaction for 1d.

scholarly journals Simulated microgravity in the ring-sheared drop

2020 ◽  
Vol 6 (1) ◽  
Author(s):  
Patrick M. McMackin ◽  
Shannon R. Griffin ◽  
Frank P. Riley ◽  
Shreyash Gulati ◽  
Nicholas E. Debono ◽  
...  
Keyword(s):  
Shear Viscosity ◽  
Simulated Microgravity ◽  
Amyloid Fibril ◽  
Space Station ◽  
Fluid Interfaces ◽  
Inertial Forces ◽  
Surface Shear ◽  
Amyloid Fibril Formation ◽  
Shearing Motion ◽  
Surface Shear Viscosity

AbstractThe ring-sheared drop is a module for the International Space Station to study sheared fluid interfaces and their influence on amyloid fibril formation. A 2.54-cm diameter drop is constrained by a stationary sharp-edged ring at some latitude and sheared by the rotation of another ring in the other hemisphere. Shearing motion is conveyed primarily by the action of surface shear viscosity. Here, we simulate microgravity in the laboratory using a density-matched liquid surrounding the drop. Upon shearing, the drop’s deformation away from spherical is found to be a result of viscous and inertial forces balanced against the capillary force. We also present evidence that the deformation increases with increasing surface shear viscosity.

An Assessment of Red Cell Deformability Using a Simple Filtration Method

1979 ◽  
Author(s):  
M Drummond ◽  
G Lowe ◽  
J Belch ◽  
C Forbes ◽  
J Barbenel
Keyword(s):  
Cell Count ◽  
Shear Viscosity ◽  
White Cell Count ◽  
White Cell ◽  
Red Cell ◽  
Cell Deformability ◽  
Red Cell Deformability ◽  
Simple Method ◽  
Filtration Method ◽  
Significant Difference

We investigated the reproducibility and validity of a simple method of measuring red cell deformability (filtration of whole blood through 5 µ sieves) and its relationship to haematocrit, blood viscosity, fibrinogen, white cell count, sex and smoking. The mean coefficient of variation in normals was 3. 7%. Tanned red cells showed marked loss of deformability. Blood filtration rate correlated with haematocrit (r = 0. 99 on dilution of samples, r = 0. 7 in 120 normals and patients). After correction for haematocrit, deformability correlated with high shear viscosity, but not low shear viscosity, fibrinogen or white cell count. In 60 normals there was no significant difference between males and females, or smokers and non-smokers, but in 11 smokers there was an acute fall in deformability after smoking 3 cigarettes (p<0. 05). Reduced deformability was found in acute myocardial infarction (n = 15, p<0. 01) and chronic peripheral arterial disease (n = 15, p<0. 01). The technique is reproducible, detects rigid cells and appears useful in the study of vascular disease.

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