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Journal of Flow Visualization and Image Processing

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DYNAMICS OF A DROPLET IMPACTING A SESSILE DROPLET ON A SUPERHYDROPHOBIC SURFACE: ROLE OF BOUNDARY CONDITIONS DURING DROPLET PLACEMENT

Volumen 28, Ausgabe 4, 2021, pp. 69-89
DOI: 10.1615/JFlowVisImageProc.2021037109
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Ankush Kumar Jaiswal
Department of Mechanical Engineering, IIT Kanpur, 208016, India
Department of Mechanical Engineering, IIT Gandhinagar, Gandhinagar-382355, India; School for Engineering of Matter, Transport and Energy, Arizona State University, Tempe, 85287, United States
Sameer Khandekar
Department of Mechanical Engineering, Indian Institute of Technology Kanpur, Kanpur (UP) 208016, India

ABSTRAKT

Experimental investigation of drop-on-drop impact on a superhydrophobic surface (contact angle ~ 155°) is performed owing to the importance of this configuration in various engineering applications. A sessile drop is first placed on the substrate in mechanical equilibrium, with two distinct deposition methods, viz., (i) gentle deposition (Wedrop 1 < 1) and (ii) impact deposition (Wedrop 1 > 1). The second drop is then made to merge in-line with the first drop (vertical coalescence) with two downward velocities, Wedrop 2 = 9.42 and 15.01, respectively. The ensuing dynamical behavior of the coalescence process of the two droplets is significantly different, depending on how the first sessile droplet is placed on the substrate. For the gentle deposition case, the two droplets coalesce, then the combined mass spreads, recedes, bounces-off, and re-impacts on the substrate before reaching the final equilibrium. However, for the second case of impact deposition, there is considerable pinning of the droplet contact line during the receding phase of the combined droplet, which is not observed in the previous case of gentle deposition. Pinning leads to breaking of the droplet mass into two unequal volume droplets; the lower, smaller droplet tending to stay back on the substrate, without participating in the rebound-process of the remaining mass. Due to difference in energetics of the two cases, the duration of combined droplet hovering in the ambient air, after bounce-off, is less for impact deposition as compared to the gentle deposition case. Maximum spread ratio is estimated with the existing analytical models and is found to be in very good agreement with the experimental values. It is concluded that drop-on-drop mergers are strongly dependent on wetting behavior and initial boundary condition/wetting transition which the droplet experiences during its placement on the substrate.

SCHLÜSSELWÖRTER: droplet impact dynamics, superhydrophobic surface, drop-on-drop impact, maximum spread diameter, coalescence, pinning
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REFERENZIERT VON

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  2. Somwanshi Praveen M., Cheverda V. V., Muralidhar K., Khandekar S., Kabov O. A., Understanding vertical coalescence dynamics of liquid drops over a superhydrophobic surface using high-speed orthographic visualization, Experiments in Fluids, 63, 2, 2022. Crossref

  3. Fan Shuangshuang, Wang Ying, Yao Kun, Shi Jiakui, Han Jun, Wan Jie, Distribution Characteristics of High Wetness Loss Area in the Last Two Stages of Steam Turbine under Varying Conditions, Energies, 15, 7, 2022. Crossref

  4. Jaiswal Ankush Kumar, Khandekar Sameer, Thermal transport during drop-on-drop impact on a heated superhydrophobic substrate, Numerical Heat Transfer, Part B: Fundamentals, 2022. Crossref

  5. Khandekar Sameer, Jaiswal Ankush Kumar, Sahu Gopinath, , 2022. Crossref

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