Investigation of foam and emulsion destruction under the great pressure gradients.
The effect of high pressure gradients with the help of the membrane under which a decreased pressure is created and centrifugal forces on a decrease of the content of the dispersion medium in the emulsion and foam and increase in the capillary pressure was studied. In a centrifugal field at low angular velocity of rotation (omega=52.3 s(-1)) the equilibrium capillary pressure is established in the emulsion and foam. At higher angular velocity the emulsion and foam were collapsed as a certain pressure is reached in Plateau borders of the emulsion and foam; this pressure was smaller than the pressure balancing the forces of the centrifugal field. The capillary pressure in the highly dispersed emulsion reached pressure drop applied to the membrane (P(sigma)=P(T)=70 kPa). Emulsions from sodium dodecylsulfate and 9-10 oxyethylated alkylphenol (OP-7) with 0.1 and 0.4 mol/dm(3) NaCl adding prepared by shaking with hexane and dodecane destructed at some capillary pressure which were less than the pressure drop supplied to the porous membrane.
Vilkova
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PGASA, Titov str. 28, Penza 440028, Russia.
Kruglyakov
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PM