Abstract
The method for the direct continuous determination of equivalent diameters and size distribution of static foam bubbles is described. Foam is continuously sucked into a glass capillary of exactly known diameter, inside of which bubbles take the form of gas cylinders separated by liquid films. The capillary is projected on a screen whereon phototransistors connected with an electronic device are placed thus making possible the length measurements of the gas cylinders and hence their volumes and equivalent diameters can be found. The method enables the continuous observations of changes in foam structure. Foams with K from 10 to 250 (wetness from 10 to 0.4 vol%) and having bubbles of size ranging from 0.4 to 3.5 mm determined by the capillary method were verified by means of volumetric and photographic methods.
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