单液滴运动相变模型
Single droplet phase transformation model during motion

在对汽水分离装置中液滴运动过程中的相变现象描述和物理机理解释的基础上，结合压力变化条件下静止单液滴相变模型的基础和液滴运动模型，建立了单液滴运动相变模型。该模型给出了液滴运动过程中，由于流动阻力和局部结构改变造成压力降低，打破汽液相平衡而造成液滴的快速蒸发和汽液相平衡蒸发2个阶段的机理解释和数学表述，与已有结果和理论分析结果均较符合。该模型可以用于液滴在重力分离空间、旋风和旋叶分离器、波纹板分离器等汽水分离装置中运动相变过程中的分离效率计算，衡量液滴相变对汽水分离性能的影响，指导分离装置结构的优化设计。
Abstract：A single droplet phase transformation model was developed for moving droplets based on the physical evaporation mechanism of the droplet phase transformation while moving in a steam-water separation plant, the model combined a static droplet phase transformation model with pressure variations and a droplet motion model. The model gives mathematical expressions for the mechanisms during the fast evaporation stage and the thermally controlled evaporation stage during the droplet movement. The pressure decreases due to the flow resistance and local structural changes, which breaks the liquid-vapor phase equilibrium. The results agree with the existed theoretical analysis. This model can be applied to separation efficiency calculations for droplets moving in steam-water separators including gravity separation, cyclone and rotary vane separators and wave plate separators, and can predict the influence of the droplet phase transformation on the separation characteristics to guide structure optimization and design of separation equipment.