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For well-stirred multiphase fluid systems the mean interface area per unitvolume, or "specific interface area" $S_V$, is a significant characteristic ofthe system state. In particular, it is important for the dynamics of systems ofimmiscible liquids experiencing interfacial boiling. We estimate the value ofparameter $S_V$ as a function of the heat influx $\dot{Q}_V$ to the system orthe average system overheat $\langle\Theta\rangle$ above the interfacialboiling point. The derived results can be reformulated for the case of anendothermic chemical reaction between two liquid reagents with the gaseous formof one of the reaction products. The final results are restricted to the caseof thin layers, where the potential gravitational energy of bubbles leaving thecontact interface is small compared to their surface tension energy.

Specific interface area in a thin layer system of two immiscible liquids with vapour generation at the contact interface