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

Xiaojian Wei,Yong Zhang,Hongzheng Zhu,Ming Yang,Jinbo Zhu

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.