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This book sets up the rigorous theoretical foundations for describing such diverse two phase flow probems as are associated with systems connected with power generation, heat transfer, transport, lubrication, information, environmental control, etc. The complete set of local laws and appropriate boundary conditions are clearly expounded, and one third of the work deals with the practical importance and unifying power of the time-average operator in making contact with macroscopic models.
RJ Bishop (Mon,) studied this question.