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Conservation equations of mass, momentum, and energy for multiphase flow, formulated on the basis of local volume averaging followed by time-averaging for turbulent flows, are presented. They are differential equations of transport with area integrals associated with interfacial transport. Because the spatial averaging theorems used in the analysis are subject to certain length scale restrictions, the resulting equations are best suited for dispersed systems. The difficulties of making direct comparisons of the volume-averaged and time-averaged conservation equations for multiphase flow are discussed. Nevertheless, an attempt was made to compare the time-averaged equations of Ishii and the energy equation used in the TRAC code with the present set of rigorously derived equations after considerable simplifications. Apparent agreement is found in all cases, although some differences remain.