Merging of two droplets at an air-water interface driven by surface tension gradient

Panday, Prashant Narayan; Darshan, Shreyansh; Bandopadhyay, Aditya; Das, Prasanta Kumar

doi:10.1016/j.ces.2024.119769

Chemical Engineering Science

2024

DOI: 10.1016/j.ces.2024.119769

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Merging of two droplets at an air-water interface driven by surface tension gradient

Prashant Narayan Panday,

Shreyansh Darshan,

Aditya Bandopadhyay

et al.

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2024

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Cited by 1 publication

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Dynamics of a droplet on the surfactant-infested free surface of another liquid

Panday,

Darshan,

Bandopadhyay

et al. 2024

Physics of Fluids

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The dynamics of liquid droplets surfing over the surfactant-infested free surface of another liquid have been explored experimentally. We analyze the motion of oil droplets that has been initiated through the creation of a surface tension gradient resulting from the deposition of a drop of surfactant at the water surface contained in the petri dish. The experiments reveal that the location of surfactant deposition with respect to the droplet position influences its motion. Due to the presence of a surface tension gradient, the footprint area of the droplet reduces and its shape changes. We have studied the temporal variation in the velocity (|vx|) of the droplets in relation to their proximity to a wall. Based on the evolution of droplet shape and change in droplet velocity, the drop dynamics can be experimentally divided into four distinct zones. Results indicate that in zone-1, |vx| grows with t as |vx|≈tn, where n is between 0.8 and 1.0. The scaling argument shows that in this zone, the surface tension force dominates the drag force, and thereby, |vx| of the droplets increases linearly with t expressed as |vx|∝t. The experimental investigation and the scaling law exhibit a reasonable agreement. In zone-2, |vx| remains more or less constant, as it is postulated that the surface tension force balances the drag force. In zone-3, a decrease in surface tension force results in a deceleration of the droplets. In zone-4, the deceleration becomes more prominent as the droplet approaches the petri dish wall.

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Dynamics of a droplet on the surfactant-infested free surface of another liquid

Panday,

Darshan,

Bandopadhyay

et al. 2024

Physics of Fluids

View full text Add to dashboard Cite

show abstract

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Merging of two droplets at an air-water interface driven by surface tension gradient

Cited by 1 publication

References 44 publications

Dynamics of a droplet on the surfactant-infested free surface of another liquid

Dynamics of a droplet on the surfactant-infested free surface of another liquid

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