A NEW REFLECTOMETRY METHOD TO MEASURE A LIQUID FOAM STABILITY

Abstract

Abstract It is questionable to estimate the stability of a liquid foam from the variation against time of the excess pressure which appears in a closed vessel containing the decaying foam. There is some evidence that in many instances the observed variation is mainly due to the change in hydrostatic pressure produced by the drainage of the liquid in the Plateau borders. A new method is proposed which is based on reflectometry measurements. It allows a quick and easy classification of foams according to the rate of decrease of their liquid film area. It may be used also as an experimental technique to evaluate the interbubble gas transfer. Additional informationNotes on contributorsJ.L. Salager∗ on sabbatical leave from Universidad de Los Andes, Mérida-Venezuela