Premixing-related behavior of steam explosions

Heat transfer partitioning model of film boiling of particle cluster in a liquid pool: implementation in a CFD code

“…Thus vapour generation in the system becomes the criteria to identify different flow regimes. The definition of different regimes and flow configurations can be found in open literatures [20,21]. The description of the flow regime is shown in Fig.…”

“…This situation is termed as phase inversion. In this situation, continuous liquid reduces to small droplets, so it is called droplet flow [20,21]. Thus vapour generation in the system becomes the criteria to identify different flow regimes.…”

“…As the heat from particles is transferred into liquid, the vapour films around each and every particle give birth to detached vapour bubbles that remain dispersed in continuous liquid. The resulting three phase flow is commonly known as film-bubbly flow [20,21]. The rate of generation of vapour bubbles depends upon different parameters like diameter, volume fraction and velocity of particles, and subcooling of liquid.…”

“…Different flow regimes during film boiling are included in the model, which is essential to characterize the multiphase flow situation. Depending upon rate of vapour generation around the particles, the three phase flow could be film-bubbly flow, transition flow or droplet flow [21,22]. The void generation due to thermal interaction between the solid particles and the liquid, and dispersion and penetration of particles due to hydrodynamic interaction are computed and analyzed.…”

“…Drag, lift, heat and mass transfer due to phase change are the major source of interaction terms for the problem under consideration. A substantial amount of researches have been carried out to estimate the interaction terms between dispersed and continuous phase on the basis of appropriate flow regime [20,21].…”