Importance of the Marangoni effect in the foaming of hot oil with phospholipids

Oil/air interfacial elasticities were measured to explain the foaming behaviour of triacylglycerol (TAG) oils at high temperature, in the presence of phospholipids. Measurements were done by dynamic drop tensiometry (DDT), and by identifying the type of Bénard–Marangoni (BM) convection patterns are formed in a shallow layer of the same oil/phospholipid mixture heated from below. am stability at high temperatures appears to be determined by the rate of drainage, which is in turn determined by the Marangoni-effect. The interfacial elasticity as measured by DDT, can be used as a measure of the Marangoni effect. The type of BM convection pattern can also be used to estimate the Marangoni effect. lation observed between the Bénard-Marangoni patterns, interfacial elasticities and foaming behaviour is shown to be physically consistent and has potential merits in the study of foaming of complex systems. In the future the work could be extended more quantitatively and verified using defined model systems.