Hi there. I need some your helps. I'd like to calculating interfacial flow between two kind of liquids. Now I know interfacial tension gradient but two shear stresses are unknown. You know, dr/dx=t1+t2. I don't know how to specify interface boundary. Plz help me... I believe you must be big helps.

"transport phenomena" - bird, stewart, lightfoot (1994 ed) p54-56. may help you out.

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Thanks mukhopadhyay. But it's not proper in my case. In that case shear stresses are same on the interface of immesible fluids. However my case is surface tension driven flow. I think shear stresses are not same on the interface.