Effect of Liquid Properties on the Characteristics of Collisions between Droplets and Solid Particles

• Published in: Applied sciences 2022-11, Vol.12 (21), p.10747
• Main Authors: Islamova, Anastasia, Tkachenko, Pavel, Shlegel, Nikita, Kuznetsov, Geniy
• Format: Article
• Language: English
• Subjects: Aqueous solutions; Atomizing; Camcorders; Cameras; child droplets; collisions; Diesel fuels; Distilled water; Droplets; Emulsions; Experiments; Fluid flow; Glycerol; interaction regimes; liquid droplets; liquid properties; Particle collisions; Particle interactions; Reynolds number; solid particles; Surface tension; Surfactants; Velocity; Viscosity; Weber number
• ISSN: 2076-3417; 2076-3417
• DOI: 10.3390/app122110747

The characteristics of the collisions of droplets with solid particles (52,100 steel) were experimentally studied when varying the key liquid properties: viscosity (1–6.3 mPa·s), surface tension (72.69–36.1 mN/m) and interfacial (liquid-liquid) tension (3.41–42.57 mN/m). Distilled water, aqueous solutions of glycerol, surfactants and diesel emulsions were used. The experimental conditions corresponded to the following ranges: Weber number 5–450, Ohnesorge number 0.001–0.03, Reynolds number 0.1–1000, capillary number 0.01–0.3. Droplet-particle collision regimes (agglomeration, stretching separation) were identified and the characteristics of secondary liquid fragments (size, number) were determined. Droplet-particle interaction regime maps in the We(Oh) and Re(Ca) systems were constructed. Equations describing the transition boundaries between the droplet-particle interaction regimes were obtained. The equations take the form: We = a · Oh + c. For the conditions of the droplet-particle interaction, the relationship We = 2214 · Oh + 49.214 was obtained. For the interaction with a substrate: We = 1.0145 · Oh + 0.0049. The experimental results were compared with the characteristics of collisions of liquid droplets with each other. Differences in the characteristics of secondary atomization of droplets as a result of collisions were identified. Guidelines were provided for applying the research findings to the development of liquid droplet secondary atomization technologies in gas-vapor-droplet applications.