Dear Shahdad, can you be more specific? What do you mean with inlet air? Is it the flow rate, temperature, humidity, etc ? Which properties of the atomizer spray would you like to find out?
Dear Shahdad, this could be formulated as energy balance of evaporization of droplets, added by the number density and the Sauter mean diameter of the droplets (maybe measured). You could try for a d²-law with heating and evaporation.