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The onset of droplet entrainment in annular downward flows
Author(s) -
Andreussi Paolo
Publication year - 1980
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450580220
Subject(s) - reynolds number , mechanics , entrainment (biomusicology) , air entrainment , flow (mathematics) , thermodynamics , physics , materials science , turbulence , rhythm , acoustics
The point of onset of large disturbance waves and droplet entrapment has been determined for the annular downward flow of air‐water mixtures in a 24 mm ID tube. Experimental results are in a good qualitative agreement with the previous work by Webb and Hewitt 1 . These results indicate that1 the critical gas velocity at the onset of entrainment is lower than the value predicted by available correlations 2 the critical gas velocity continuously decreases at increasing the liquid Reynolds number 3 below a liquid Reynolds number of 270 no entrainment occurs even at gas velocities as high as 80 m/secA correlation for the critical gas velocity which is based on a simple physical model of atomization, is also proposed.