Spray cooling is widely used in relieving heat stress in dairy cows during summer. in which the cooling effect is highly correlated to the diameter of water droplet. To optimize the average diameter of spraying droplet (ADSD) in the process of heat transfer. a theoretical analysis was performed based on the enthalpy difference theory in this study. https://thegreensjunglebeautyshops.shop/product-category/liquid-eyeliner/