Droplet entrainment in vertical annular flow and its contribution to momentum transfer

AIChE Journal ◽  
1986 ◽  
Vol 32 (9) ◽  
pp. 1500-1515 ◽  
Author(s):  
J. C. B. Lopes ◽  
A. E. Dukler
Keyword(s):  
Momentum Transfer ◽  
Annular Flow ◽  
Droplet Entrainment

Droplet deposition and momentum transfer in annular flow

AIChE Journal ◽  
1995 ◽  
Vol 41 (9) ◽  
pp. 2040-2046 ◽  
Author(s):  
Larry B. Fore ◽  
Abraham E. Dukler
Keyword(s):  
Momentum Transfer ◽  
Annular Flow ◽  
Droplet Deposition

Experimental Observation of Nucleate Boiling Entrainment in a Liquid Film

2021 ◽  
Author(s):  
Junpei Tabuchi ◽  
Yuki Narushima ◽  
Kenichi Katono ◽  
Tomio Okawa
Keyword(s):  
Liquid Film ◽  
Forced Convection ◽  
Vapor Bubble ◽  
Water Surface ◽  
Annular Flow ◽  
Nucleate Boiling ◽  
Vapor Bubbles ◽  
Droplet Entrainment ◽  
Bubble Bursting ◽  
Filament Breakup

Abstract Many studies have been conducted on droplet entrainment in an annular flow regime, but little is known about droplet entrainment caused by nucleate boiling. In this report, visualization results of droplet entrainment caused by nucleate boiling are described. We observed two processes of droplet entrainment. The first one causes bubble bursting at a water surface. The second one causes filament breakup which occurs when the vapor bubble reaches and collapses at the interface between air and liquid. From comparison of the phenomena for the two processes, we found that the diameters of the droplets and vapor bubbles were considerably different. Using the results of this research allows the effect of forced convection to be taken into account. In the future, we plan to expand the amount of data and develop a boiling entrainment model under forced convection conditions.

Effect of Heat Flux on Droplet Entrainment Using Annular Flow Dryout Model

2010 ◽  
Author(s):  
Masroor Ahmad ◽  
Evgeniy Burlutskiy ◽  
Simon P. Walker ◽  
Geoffrey F. Hewitt
Keyword(s):  
Experimental Data ◽  
Heat Flux ◽  
High Pressure ◽  
Liquid Film ◽  
Annular Flow ◽  
High Pressures ◽  
Droplet Entrainment ◽  
Annular Film ◽  
Low Pressures ◽  
Flow Experiments

Annular film dryout depends upon the competition of entrainment, deposition and evaporation processes between the droplet-laden core and wall liquid film. In this paper, effect of heat flux on droplet entrainment is analyzed by modeling different low and high pressure diabatic annular flow experiments numerically using an annular flow dryout model (AFM). Overall, the AFM predicted the experimental data reasonably accurately. It is concluded that at high pressures increasing heat flux may enhance net entrainment considerably but this effect diminishes at low pressures.

Numerical modeling of a horizontal annular flow experiment using a droplet entrainment model

2015 ◽  
Vol 77 ◽  
pp. 351-360 ◽  
Author(s):  
Thomas Höhne ◽  
Thomas Geissler ◽  
André Bieberle ◽  
Uwe Hampel
Keyword(s):  
Numerical Modeling ◽  
Annular Flow ◽  
Droplet Entrainment ◽  
Flow Experiment

A model for droplet entrainment in heated annular flow

2002 ◽  
Vol 23 (6) ◽  
pp. 807-822 ◽  
Author(s):  
M.J. Holowach ◽  
L.E. Hochreiter ◽  
F.B. Cheung
Keyword(s):  
Annular Flow ◽  
Droplet Entrainment
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