![]() ![]() Several test calculations were performed to assess the accuracy and applicability of the TRANSG-N models. The steady-state and transient steam generator models developed in the present study are incorporated into the TRANSG-N computer code. The heat flux terms for the liquid and vapor equations are obtained through a proposed energy partition model which accounts for the nonequilibrium effects of both vapor and liquid, and satisifies the constraints in the steady-state limit. The finite-difference form of the nonequilibrium drift-flux equations is obtained through the staggered mesh structure of the implicit continuous-fluid Eulerian (ICE) scheme. The conservation equations are derived in a form that allows for easy comparison among various two-phase flow more ยป models. The liquid and vapor equations are derived by combining the continuity equation with energy equation for each phase. ![]() The five fluid conservation equations used in the formulation include the continuity, momentum, and energy equations for the mixture and the liquid and vapor equations. The nonequilibrium drift-flux model is based on a one-dimensional, separated-flow, single-channel formulation. This thesis describes the development and verification of a nonequilibrium drift-flux steam generator model to simulate and analyze various transients encountered in nuclear plants utilizing light water reactors.
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