Direct numerical simulation of bubble dynamics in subcooled and near-saturated convective nucleate boiling

摘要: Abstract With the long-term objective of Critical Heat Flux (CHF) prediction, bubble dynamics in convective nucleate boiling flows has been studied using a Direct Numerical Simulation (DNS). A sharp-interface phase change model which was originally developed for pool is extended to flows. For physical scales smaller than smallest flow (smaller grid size), micro-scale used. After dependency study and parametric contact angle, four cases simulation were carried out with different wall superheat degree subcooling. The structures around growing investigated together accompanying physics. relation between heat flux evolution growth studied, along investigations diameter base evolutions across cases. As validation, compared experimental observations. departure period shapes show good agreement experiment simulation, although Reynolds number relatively low.