Measuring liquid—liquid interfacial behavior with the deep-channel surface viscometer

Measurement of Viscoelastic Effects With a Deep Channel Surface Viscometer

“…In order to achieve this condition, inertial effects must be eliminated (see assumption 6) and the effect of contact angle boundary conditions nullified by positioning the interface at a small ledge or knife-edge cut in the wall (Wei and Slattery, 1976;Deemer et al, 1980). 4) There is no mass transfer to or from the gas-liquid interface.…”

“…(1971) gave an approximate analysis in which a Powell-Eyring model is used for the interface. Hegde and Slattery (1971;Wei and Slattery, 1976;Deemer et al, 1980;Jiang et al, 1984) I I I I I I I I I I I I I I I I I . I I I I I I apparent surface shear viscosity can be determined from measurements of the velocity distribution in the interface without assuming a specific form for the interfacial stressdeformation behavior.…”

“…But this technique is not suitable for those liquid-liquid systems where the upper phase is opaque or where small particles cannot be found that will float at the interface. An alternative experiment for liquidliquid interfaces is described by see also Deemer et a/., 1980).…”