Foam rupture under combined action of gravity and centrifugal force

• Autorzy: Jachimska B. , Małysa K.
• Języki publikacji: EN

Abstrakty

EN

The effect of additional centrifugal force on stability and volume of the foam formed was studied. Foamability of butanol-1 solutions was studied using the combined pneumatic-mechanical method in which foam was formed by air supplied through the sintered glass and simultaneous action of the mixer rotations. The effect of centrifugal force on the time of rupture of the foam column was determined from measurements of its lifetime either when (i) both the gas supply and mixer rotations were switched off, or (ii) only the gas supply was switched off (the mixer rotated all the time). It was found that in the presence of mixer rotations the time of rupture was always significantly higher, and varied with the velocity of mixer rotations. Longer lifetimes of foam columns in the presence of mixer rotations indicate that the gravitational drainage was slowed down by the centrifugal force exerted by the mixer on foam, and acting in a direction perpendicular to the gravity. A simple model taking into account the influence of additional centrifugal force on gravitational syneresis was elaborated. Model predictions stating that in the presence of centrifugal force the time of drainage should be longer and should depend on angular velocity of the mixer rotation are in a good agreement with the experimental data obtained.

Słowa kluczowe

EN

foam; lifetime; centrifugal force; gravitation

PL

piana; czas życia; siła odśrodkowa; grawitacja

• Wydawca: Centrum Upowszechniania Nauki PAN
• Czasopismo: Bulletin of the Polish Academy of Sciences. Chemistry
• Rocznik: 2000
• Tom: Vol. 48, No. 2
• Strony: 167--179
• Opis fizyczny: Bibliogr. 28 poz.

Twórcy

autor

Jachimska B.

autor

Małysa K.

• Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, ul. Niezapominajek, 30-239 Cracow, Poland (Instytut Katalizy i Fizykochemii Powierzchni PAN)