Numerical study on pressure drop and heat transfer characteristics of gas-liquid Taylor flow in a microchannel based on FFR method

摘要

Two-phase Taylor flow in microchannels as a critical way to enhance heat dissipation has attracted extensive attention due to the high integration and miniaturization development of electronic devices. To further elucidate the pressure drop and development process of heat transfer characteristics in Taylor flow, a 2-D planar T-junction microchannel with a width of 1 mm was investigated numerically by using the fixed frame computational domain method. The local Nusselt number distribution is divided into four parts for analysis, and the effects of mixture velocity and void fraction on the heat transfer coefficient are also discussed. The results indicate that the injection of gas-phase leads to an increase in pressure gradient, and the flow-pattern related model has a better predictive result. Strong evidence of internal circulation was found when the shear stress in Y direction is not equal to zero in Taylor flow. The investigation of Nusselt number has shown that the mixture velocity and the void fraction affect the temperature field distribution and heat absorption capacity in the liquid slug, respectively. Together these simulation data, nearly 1.8 times higher of the Nusselt number was observed compared to pure water flow.