Measurement of interfacial tension of immiscible liquids of equal density

AIChE Journal ◽  
1988 ◽  
Vol 34 (1) ◽  
pp. 155-157 ◽  
Author(s):  
S. B. Reddy Karri ◽  
V. K. Mathur
Keyword(s):  
Interfacial Tension ◽  
Immiscible Liquids ◽  
Equal Density

A note on the mechanism of the instability at the interface between two shearing fluids

1984 ◽  
Vol 144 ◽  
pp. 463-465 ◽  
Author(s):  
E. J. Hinch
Keyword(s):  
Interfacial Tension ◽  
Couette Flow ◽  
Viscous Fluids ◽  
Physical Explanation ◽  
Two Fluids ◽  
Equal Density

In a recent paper Hooper & Boyd (1983) have shown that the unbounded stratified Couette flow of two viscous fluids of equal density and with no interfacial tension is always unstable. They found that the instability arises at the interface between the two fluids and occurs at short wavelengths where viscosity is more important than inertia. The purpose of this note is to provide a simple physical explanation of the mechanics of the instability.

scholarly journals Interfacial tension measurement of immiscible liquids using a capillary tube

AIChE Journal ◽  
1992 ◽  
Vol 38 (4) ◽  
pp. 615-618 ◽  
Author(s):  
N. Rashidnia ◽  
R. Balasubramaniam ◽  
D. Del Signore
Keyword(s):  
Interfacial Tension ◽  
Capillary Tube ◽  
Immiscible Liquids

An acoustic method of measuring interfacial tension on the interface between immiscible liquids

2009 ◽  
Vol 47 (2) ◽  
pp. 187-194 ◽  
Author(s):  
V. V. Filippov ◽  
D. A. Yagodin ◽  
P. S. Popel’
Keyword(s):  
Interfacial Tension ◽  
Acoustic Method ◽  
Immiscible Liquids

Instability of the flow of two immiscible liquids with different viscosities in a pipe

1984 ◽  
Vol 141 ◽  
pp. 309-317 ◽  
Author(s):  
Daniel D. Joseph ◽  
Michael Renardy ◽  
Yuriko Renardy
Keyword(s):  
Stability Analysis ◽  
Viscous Fluid ◽  
Viscous Dissipation ◽  
Flow Rate ◽  
Linear Stability Analysis ◽  
Volume Ratio ◽  
Immiscible Fluids ◽  
Immiscible Liquids ◽  
The Core ◽  
Equal Density

We study the flow of two immiscible fluids of different viscosities and equal density through a pipe under a pressure gradient. This problem has a continuum of solutions corresponding to arbitrarily prescribed interface shapes. The question therefore arises as to which of these solutions are stable and thus observable. Experiments have shown a tendency for the thinner fluid to encapsulate the thicker one. This has been ‘explained’ by the viscous-dissipation principle, which postulates that the amount of viscous dissipation is minimized for a given flow rate. For a circular pipe, this predicts a concentric configuration with the more viscous fluid located at the core. A linear stability analysis, which is carried out numerically, shows that while this configuration is stable when the more viscous fluid occupies most of the pipe, it is not stable when there is more of the thin fluid. Therefore the dissipation principle does not always hold, and the volume ratio is a crucial factor.

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