along the water path, the water droplet temperature and the velocity decreases, the droplet density increases, the droplet diameter decreases, but the total contact area between the droplet and the gas still increases.

• 沿水滴流动方向 ,水滴的温度和速度降低 ,水滴浓度增加 ,水滴直径变小 ,但是水滴侧与空气侧的接触总面积却依然增加 ;