Measurements of the pressure drop and droplets sizes and mean droplet size produced by conical twin fluid atomizers with the swirl motion phenomenon were carried out using the microphotography method. Atomizing gas flow rates of up to 5.6.10(-4) [m(3)/s] and liquid flow rate up to 1.11.10(-4) [m(3)/s] were used. The effect of atomizer dimensions on spray parameters was studied using several geometries of conical atomizers. It has been shown that the pressure drop depends on gas and liquid flow rates and dimensions of atomizer. Additionally, the swirl motion inside of atomizer affects the spray quality. The empirical correlation for Euler number and Sauter mean diameter were proposed. The obtained data is very important for atomizers designing, especially including some of twin-fluid atomizers. (C) 2016 Elsevier B.V. All rights reserved.