Abstract
Chilldown process is usually the initial operation for storing and transporting cryogenic fluids. During this process, film boiling is of great importance in terms of the large time span. In this research, a numerical model was built to study the flow regime and heat transfer characteristics of the film boiling with cryogenic fluids. An algebraic interface area density framework was coupled in the model to calculate the drag force at the liquid-gas interface. Accordingly, the effects of wall superheat and mass flow rate on heat flux and film thickness were investigated. Furthermore, the variance analysis method was employed to evaluate the weight of the effects of superheat and inlet mass flow and their coupling effect on the heat transfer coefficient. The results reveal that the wall superheat effect prevails over the mass flux effect on the heat transfer coefficient. Moreover, the two factors have a relatively weak coupling impact on the heat transfer coefficient. Finally, the features of pressure drop in the tube were further analyzed.
Highlights
INTRODUCTIONWidely used in aerospace and superconduction fields, are generally transported through adiabatic pipelines
Cryogenic fluids, widely used in aerospace and superconduction fields, are generally transported through adiabatic pipelines
It shows that flow boiling can be successively divided into four stages as ΔTw increases, including the single-phase liquid convection stage, nucleate boiling stage, transition boiling stage, and film boiling stage
Summary
Widely used in aerospace and superconduction fields, are generally transported through adiabatic pipelines. It shows that flow boiling can be successively divided into four stages as ΔTw increases, including the single-phase liquid convection stage, nucleate boiling stage, transition boiling stage, and film boiling stage. A numerical model was built to investigate the film boiling characteristics in the chilldown process in a vertical circular tube. Tou and Tso numerically investigated the heat transfer characteristics of stable film boiling on a sphere They amended the constant number in the Nusselt expression. Zhang and Jia numerically studied flow boiling in microchannels, and they found that the evolution of flow patterns
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