关键词: 液化天然气； 液舱预冷； 液滴运动； 单液滴蒸发模型； 吹拂效应

Abstract: A novel model was built based on the computational fluid dynamics method. By multiple temperature differences, the static and moving liquefied natural gas (LNG) droplets of multiple relative velocity differences and multiple droplet diameters evaporation were simulated. Their blowing effects were identified. It was found that the higher vapor temperature is, the bigger relative velocity and the bigger diameter are, and they could enhance the droplet interface heat transfer rate. As the increase of vapor temperature, the temperature boundary layer becomes thicker and the thickness ratio becomes larger, but the heat transfer ratio presents a piecewise linearity characteristic. The piecewise linearity critical point of moving droplet evaporation is lower than the static droplet evaporation, but the blowing effect is bigger. The blowing effect is enhanced because vapor temperature increases. The blowing effect becomes weaker as the relative velocity increases, the blowing effect could be omitted when the relative velocity is bigger than 18m/s. The blowing effect almost keeps the same as the diameter increases.

Key words: liquefied natural gas (LNG); tank cooling down; droplet movement; single droplet evaporation model; blowing effect