Pulsed laminar falling films in vertical tubes: Maintaining a continuous liquid film with reduced film thickness

Analysis of Laminar Film Condensation on a Vertical Plate

Second Law Analysis of a non-Newtonian Laminar Falling Liquid Film Along an Inclined Heated Plate

The second law analysis of heat transfer of a non-Newtonian, laminar falling liquid film along an inclined heated plate is investigated. The upper surface of the liquid film is considered free and adiabatic. Velocity and temperature profiles are obtained analytically and used to compute the entropy generation number (Ns), irreversibility ratio (Ф) and the Bejan number (Be) for several values of...

Liquid films with high surface modulus moving in tubes: dynamic wetting film and jumpy motion

The thickness of the falling film of liquid around a Taylor bubble

We present the results of laboratory experiments that quantify the physical controls on the thickness of the falling film of liquid around a Taylor bubble, when liquid–gas interfacial tension can be neglected. We find that the dimensionless film thickness l′ (the ratio of the film thickness to the pipe radius) is a function only of the dimensionless parameter Nf = r √ gD3/m, where r is the liqu...

Thickness of residual wetting film in liquid-liquid displacement.

Core-annular flow is common in nature, representing, for example, how streams of oil, surrounded by water, move in petroleum reservoirs. Oil, typically a nonwetting fluid, tends to occupy the middle (core) part of a channel, while water forms a surrounding wall-wetting film. What is the thickness of the wetting film? A classic theory has been in existence for nearly 50 years offering a solution...