Abstract
Phase changes associated with the boiling of cryogenic liquids are interesting phenomena. In the present study, liquid nitrogen, which has applications in microelectronics, semiconductors, and the space sector, has been considered as a representative cryogenic fluid. The boiling of liquid nitrogen was investigated at different lengths and time scales. At the micro level, classical molecular dynamics (MD) based simulations were performed to understand various facets of boiling, considering a film of liquid nitrogen on a solid surface. For macroscale study, the route of computational fluid dynamics (CFD) has been adopted. For accurately tracking the dynamic interface, coupled level set volume of fluid approach (CLSVOF) has been implemented. CFD results show the formation of vapour bubbles in liquid nitrogen at different degrees of wall superheats. Temporal variation of heat flux has been evaluated. Finally, the results obtained from MD and CFD simulations have been compared.
