Influences of a spill rate on spread and evaporation of cryogenic liquid on land
This paper deals with spread and evaporation of a cryogenic liquid on land. The evaporation velocity, the vaporized volume of the liquid per unit area and unit time, is measured for the first time as a function of a release flow rate and time for liquid nitrogen that is spreading radially. The evaporation velocity is one of the main parameters that govern the phenomena of a pool spreading with evaporation, and it has been assumed as a constant within many of numerical modelling studies. Liquid nitrogen is spilled with finite flow rates onto an unbounded concrete ground. The experiments were conducted for various spill rates to assess the effects of this factor on spread and the evaporation velocity. It is found that a greater spill rate resulted in a faster spreading pool and a greater evaporation velocity.