Pressure Waves due to Rapid Evaporation of Water Droplet in Liquid Lead Coolantстатья
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Дата последнего поиска статьи во внешних источниках: 12 сентября 2018 г.
Аннотация:Flash evaporation of a superheated water droplet in heavy liquid metal coolant (lead) is considered, in application to the analysis of a lead-cooled fast reactor steam generator tube rupture accident. Te model is based on thermodynamic equilibrium formulation for the expanding water-steam mixture and inviscid compressible formulation for the surrounding liquid lead, with the interface conditions determined from the solution of the Riemann problem. Numerical solution is performed in the spherically symmetric geometry using a conservative numerical scheme with a moving sharp interface. Transient pressure and velocity profles in each phase are presented for the parameters typical of the steam generator tube rupture accidents, demonstrating the process of boiling water expansion and pressure wave formation in the coolant. Te results obtained are compared with a simplifed model which
considers the volume-averaged parameters of boiling water droplets and considers coolant as an incompressible liquid. Good agreement between the full and simplifed models is demonstrated. Impacts of coolant fow on structures caused by pressure wave propagation and subsequent coolant fow are discussed.