## MICROCHANNEL DEFINITION FOR TWO-PHASE FLOW BOILING: DEFINING A CRITICAL DIMENSION
## 摘要The definition of microchannel size in the literature for two-phase flow boiling is arbitrary. There is no universally accepted definition. The transition from macrochannel to microchannel cannot be based solely and arbitrarily on the physical dimensions of the channel. The purpose of this paper is to define a critical dimension for a microchannel. It is proposed that there should be no difference between the temperature on the tip of the bubble and the average mixed temperature of the fluid at the point of bubble departure with the temperature of both equal to the saturation temperature. In this situation, the bubble should be stable after detachment. The point of bubble departure from the heated surface is determined from the force balance (buoyant force, surface tension force, and friction force) on the bubble, and the temperature distribution away from the heated wall. The hydraulic diameter was determined by solving the resulting equations. The properties of CO |

主页 | 旧刊 | 有关人员 | 未来大会 | American Society of Thermal and Fluids Engineering |