Two-phase flow instability induced by flashing in natural circulation systems: An analytical approach

An analytical approach is presented to analyse flashing induced instabilities in two-phase flow systems. Averaged conservation equations of the drift flux model are used describe flow. For closure these equations, Flashing Boundary, ?fl and Gas Generation due Flashing, ?g,fl have been derived from constitutive relationships for working fluid. A few models developed discussed. The thus solved small perturbations assuming linear stability. stability boundary plotted on Subcooling-Phase Change number plane. This corroborated with recent experimental studies.