Interaction of a sound beam with a two‐fluid interface

1987 ◽  
Vol 82 (S1) ◽  
pp. S78-S78
Author(s):  
Jacqueline Naze Tjøtta ◽  
Hanne Sagen ◽  
Sigve Tjøtta
Keyword(s):  
Fluid Interface ◽  
Sound Beam ◽  
Two Fluid

Transmission and reflection of a real sound beam at a two‐fluid interface

1989 ◽  
Vol 85 (S1) ◽  
pp. S93-S93
Author(s):  
Jacqueline Naze Tjøtta ◽  
Hans‐Christen Salvesen ◽  
Sigve Tjøtta
Keyword(s):  
Fluid Interface ◽  
Sound Beam ◽  
Two Fluid ◽  
Transmission And Reflection

Buoyancy flow at a two-fluid interface in a porous medium: Analytical studies

1988 ◽  
Vol 24 (4) ◽  
pp. 493-506 ◽  
Author(s):  
Göran Hellström ◽  
Chin-Fu Tsang ◽  
Johan Claesson
Keyword(s):  
Porous Medium ◽  
Fluid Interface ◽  
Buoyancy Flow ◽  
Analytical Studies ◽  
Two Fluid

Two-Fluid Electroosmotic Flow in Microchannels

2008 ◽  
Author(s):  
T. N. Wong ◽  
Y. Gao ◽  
C. Wang ◽  
C. Yang ◽  
N. T. Nguyen ◽  
...  
Keyword(s):  
Electric Field ◽  
Applied Electric Field ◽  
Electroosmotic Flow ◽  
Viscosity Ratio ◽  
Experimental Investigations ◽  
Fluid Interface ◽  
Surface Charges ◽  
Interface Position ◽  
Proposed Model ◽  
Two Fluid

This paper presents theoretical and experimental investigations of the pressure-driven two-liquid flow in microchannels with the electroosmosis effect. For a fully developed, steady state, laminar flow of two liquids combined the pressure gradient, electroosmosis and surface charges at the liquid-liquid interface, we have derived analytical solutions that relate the velocity profiles and flow rates to the liquid holdup, the aspect ratio of the microchannel, the viscosity ratio of the two liquids and the externally applied electric field. It was shown that adjusting the externally applied electric field could control the fluid interface position precisely. The prediction from the proposed model compares very well with measured data.

Measurements of liquid film thickness for a droplet at a two-fluid interface

2012 ◽  
Vol 24 (2) ◽  
pp. 022106 ◽  
Author(s):  
G. Oldenziel ◽  
R. Delfos ◽  
J. Westerweel
Keyword(s):  
Film Thickness ◽  
Liquid Film ◽  
Liquid Film Thickness ◽  
Fluid Interface ◽  
Two Fluid

scholarly journals The effect of a low-viscosity near-wall film on bypass transition in boundary layers

2015 ◽  
Vol 772 ◽  
pp. 330-360 ◽  
Author(s):  
Seo Yoon Jung ◽  
Tamer A. Zaki
Keyword(s):  
Boundary Layer ◽  
Turbulence Intensity ◽  
Free Stream ◽  
Transition To Turbulence ◽  
Bypass Transition ◽  
Fluid Interface ◽  
Free Stream Turbulence ◽  
Wall Film ◽  
The Impact ◽  
Two Fluid

Bypass transition in a two-fluid boundary layer is examined using direct numerical simulations (DNSs). A less-viscous wall film is considered and the impact on transition location is evaluated at two different viscosity ratios and free-stream turbulence intensities. The less-viscous wall film absorbs the mean shear from the outer stream, weakens the lift-up mechanism, and alters the disturbance field inside the boundary layer. These effects all favour a delay in the onset of bypass transition. However, the viscosity and mean-shear discontinuities across the two-fluid interface introduce a new mechanism for the generation of wall-normal vorticity in the boundary layer, and can therefore promote transition to turbulence. Conditionally averaged statistics and streak tracking techniques are adopted in order to examine the impact of the wall film on the bypass transition process. It is shown that the weaker amplification of the streaks in the outer fluid can delay breakdown to turbulence, despite the additional disturbance generation at the two-fluid interface. The efficacy of the wall film in delaying transition is demonstrated at moderate level of free-stream turbulence intensity, but is reduced as the turbulence intensity is increased.

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