Abstract
A compound optical probe is described which is used to determine the distribution of bubble sizes and velocities when liquids are distilled on sieve trays in the froth regime. It is shown how the plate efficiencies may be thereby evaluated by thus taking into proper account the derived distribution of vapour residence times and mass transfer coefficients. The results are seen to agree with published data. Froth properties for several boiling liquids on two sieve plates are reported.
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