This work involves the development of an analytical model to calculate the transient two-phase mass flux in a conduit instrumented with a free-field turbind flow meter. The effects of rotor inertia, velocity and void profiles in the conduit, slip ratio, imperfect guidance of the flow by the rotor blades, bearing friction and windage losses have been incorporated into the model. The analytical Turbine-meter Evaluation Model for Two-Phase Transients (TEMPT) was programed and was used for numerical calculations. For a typical blowdown transient, the effects of velocity and void profiles, and rotor inertia were found to be the most significant parameters.

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