The onset of droplet entrainment in annular downward flows

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Abstract
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 Hewitt1. These results indicate that the critical gas velocity at the onset of entrainment is lower than the value predicted by available correlations the critical gas velocity continuously decreases at increasing the liquid Reynolds number below a liquid Reynolds number of 270 no entrainment occurs even at gas velocities as high as 80 m/sec A correlation for the critical gas velocity which is based on a simple physical model of atomization, is also proposed.

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