Effect of Na+ on the collision of the dodecane droplet and kinetic energy transfer

• Published in: Fuel (Guildford) Vol. 356; p. 129585
• Main Authors: Wei, Xiaojian, Zhang, Yong, Zhu, Hongzheng, Yang, Ming, Zhu, Jinbo
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 15.01.2024
• Subjects: Collision; Dodecane droplet; Energy transfer; Interfacial tension; Na+; Dodecane droplet; Na+; Energy transfer; Interfacial tension; Collision
• ISSN: 0016-2361
• DOI: 10.1016/j.fuel.2023.129585

•The three processes of collector droplets collision are revealed.•The energy and the net force of the dodecane-solution interface decrease with an increase in Na+ concentration.•The dodecane droplet’s rate of energy dissipation increases. Using a high-speed motion acquisition system, the dodecane droplet size and the interface energy of the dodecane-solution interface during the collision between the dodecane droplet and the dodecane layer at different Na+ concentrations were studied. The collision process is divided into three stages: Contact stage, Stretch stage and Attenuation amplitude stage. The size of the dodecane droplet gradually decreases as the Na+ concentration increases, and the stretching time does too. The kinetic energy of the dodecane droplet, the surface energy of the dodecane-solution interface, and the net force of the dodecane droplet all decrease with an increase in Na+ concentration, but the dodecane droplet rate of energy dissipation increases. The effect of Na+ concentration on dodecane-solution interfacial tension is the main reason for the collision difference. The Na+ added to the solution forms a hydration shell around it, weakening the interaction between water molecules at the dodecane-solution interface and within the solution, leading to reduced interfacial tension. The advancement of mineral flotation technology may benefit greatly from these findings.