Modeling Growth of A Vapor Film Formed in Contact between Hot Metallic Sphere and Water in The Pressure Vessels

Creation and growth of vapor film in contact between hot objects and liquids is possible in many industries, including nuclear reactors, metals casting industries and paper production. Due to severe heat transfer from a hot objects (as droplets of molten metal) in contact with a coolant and relatively volatile matter (like water), the pressure inside vapor film formed on hot sphere increases at very short time and result in, sudden pressure wave inside related substance storage structure is created and so this wave may lead to destruct the storage structure. In this paper First, the mathematical model of problem is obtained and then conclusion of numerical solution and previous studies is compared. Then, the effects of changing various pressures in vessels On the vapor film radius, vapor film pressure is investigated and finally this model is developed for contact between reactor coolant and hot objects in such nuclear power plants in which pressurized water is 60 to 150 bars. Results show that in case of high pressure inside vessel, the pressure inside vapor film increases to high values in a very short time.