Extensive studies have been conducted on the droplet impact behaviour on symmetric surfaces like spheres and flat surfaces. The literatures regarding the impact of hydrophobically coated symmetric surfaces and super heated symmetric curves with diameter ratios below 1. In this study, we experimentally examined how water droplets intract when they come into contact with solid spherical targets. Studies of droplet impact and post-impact outcomes have been carried out on hydrophilic, hydrophobic and super heated surfaces. The thermo hydrodynamic behaviour of millimeter-scale water droplets impacting on spherical profiles is established through experiments. Mono dispersed water droplets are impinged on surface which is the Leidenfrost temperature maintained 180  \(^{\circ }\) C. High-speed imaging techniques are employed to visualise droplet evolution, and Weber numbers range from 5 to 170. In order to study impact phenomena in side and top views, high-speed imaging techniques are used. Using geometrical parameters, such as the length of spreading and thickness of the liquid layer near the north pole of the target surface, the morphological effects of this collision process are quantitatively analysed. Observations reveal that as spherical target size decreases, covering increases, yet the thickness of the liquid coating near the target surface’s north pole decreases. The liquid layer’s thickness was plotted over time at the North Pole target, and it was discovered that it matched theoretic predictions from earlier investigations. Different morphologies are seen when droplets interact with hydrophilic, hydrophobic and super heated surfaces. This investigation might help us better understand how fluids with intricate forms and geometries behave when they are wetted, sprayed or coated.

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Experimental Investigation of Droplet Impact on Spherical Particles

  • K. Niju Mohammed,
  • Abhijith Vijayan,
  • P. S. Tide,
  • Franklin R. John,
  • Ranjith S. Kumar

摘要

Extensive studies have been conducted on the droplet impact behaviour on symmetric surfaces like spheres and flat surfaces. The literatures regarding the impact of hydrophobically coated symmetric surfaces and super heated symmetric curves with diameter ratios below 1. In this study, we experimentally examined how water droplets intract when they come into contact with solid spherical targets. Studies of droplet impact and post-impact outcomes have been carried out on hydrophilic, hydrophobic and super heated surfaces. The thermo hydrodynamic behaviour of millimeter-scale water droplets impacting on spherical profiles is established through experiments. Mono dispersed water droplets are impinged on surface which is the Leidenfrost temperature maintained 180  \(^{\circ }\) C. High-speed imaging techniques are employed to visualise droplet evolution, and Weber numbers range from 5 to 170. In order to study impact phenomena in side and top views, high-speed imaging techniques are used. Using geometrical parameters, such as the length of spreading and thickness of the liquid layer near the north pole of the target surface, the morphological effects of this collision process are quantitatively analysed. Observations reveal that as spherical target size decreases, covering increases, yet the thickness of the liquid coating near the target surface’s north pole decreases. The liquid layer’s thickness was plotted over time at the North Pole target, and it was discovered that it matched theoretic predictions from earlier investigations. Different morphologies are seen when droplets interact with hydrophilic, hydrophobic and super heated surfaces. This investigation might help us better understand how fluids with intricate forms and geometries behave when they are wetted, sprayed or coated.