Evolution of a Mixture of Hot Particles. Steam, and Water Immersed in a Water Pool

An integral approach for simulation of vapour film dynamics around a spherical surface

“…An expression for the radiative heat flux term in Eq. (2.5b) can be obtained by employing Stefan-Boltzmann equation along with the assumption that assuming both the metal surface and the liquid interface as gray diffuse and the intervening steam layer as transparent [17,18]. Following these manipulations in Eq.…”

“…In fact, detailed numerical simulation [19] revealed the temperature of the sphere to remain practically constant at its initial value. Bejan et al [17] and Cacuci et al [18] argued the inside the vapour, the changes of pressure and its associated saturation temperature to be small. Based on these observations, the conditions imposed at the sphere surface and the interface are as follows:…”

“…Like earlier studies [17,18], the surface temperature of the sphere has been assumed constant in view of the timescale of interest in this work (∼ 2 s) and the high thermal inertia of the sphere. In fact, detailed numerical simulation [19] revealed the temperature of the sphere to remain practically constant at its initial value.…”

“…Though such dynamic studies are of interest for the prediction of rapid collapse of a vapour film during molten fuel-coolantinteraction [15,16] and a number of other technical applications [15], these remain limited till date. Bejan et al [17] and Dan et al [18] investigated the growth of a vapour film around a molten metal drop immersed in a saturated liquid. They considered radiative heat transfer between the metal drop and the water, considering the vapour layer to be non-participating.…”