Numerical Simulation to Investigate the Influence of Gas-Liquid Interface on Heat Transport in micro tube

Abstract

In this study, the effect of the gas-liquid interface in a small tube on heat transport was investigated using numerical analysis to elucidate the mechanism of highly efficient heat transport in heat pipes. As in the previous study, it was confirmed that the liquid film thickness at the gas-liquid interface in the capillary becomes thinner as the capillary number decreases. This is considered to be an effect of the average flow velocity in the tube. In the analysis with the pressure gradient changed, it was confirmed that the position of the bubble was advanced in the calculation area compared to the previous study. The average flow velocity in the liquid phase was also found to be faster than in the previous study, which is thought to be due to the strong circulation. However, since the flow is counterclockwise and the bubble shape is consistent, we consider the results to be qualitatively consistent. It can be considered that the shape of the gas-liquid interface in the microtubule is strongly influenced by the flow velocity. In the future, we will evaluate sensible heat transport and latent heat transport with phase change.