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The impact of a single droplet on various surfaces is widespread in nature and prevalent across numerous industries such as pharmaceuticals, chemicals, spray drying, coating, ink-jet printing, jet cleaning, self-cleaning surfaces, anti-icing, forensic science, and others. This study presents a Volume-of-Fluid (VOF)-based multiphase simulation of a single droplet impacting a hydrophobic solid surface in a quasi-steady air medium at atmospheric pressure. The droplet’s shape transitions from spherical to ellipsoidal (by varying the ratio of major to minor axes) to explore how shape of the droplet affects spreading and retraction dynamics during post-impact. A novel image processing algorithm is introduced to model the dynamic contact angle (DCA). Present study investigates the temporal and spatial evolution of spreading factor, apex height, and shape factor. Using a finite volume-based solver in ANSYS FLUENT, simulations were conducted at specific Weber (We)  and Reynolds (Re) numbers of 10 and 1575, respectively. This research offers unique insights into droplet dynamics and morphology during spreading and retraction, which could enhance understanding of related natural and industrial phenomena.

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Numerical Investigation of Droplet Impacting on a Solid Surface: Effect of Droplet Shape

  • 会议论文

  • 发表日期：

    2025年

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  • Arnab Chakraborty,
  • Poorva Mondal,
  • P. Karundev,
  • Venkata Sudheendra Buddhiraju,
  • Venkataramana Runkana

摘要

The impact of a single droplet on various surfaces is widespread in nature and prevalent across numerous industries such as pharmaceuticals, chemicals, spray drying, coating, ink-jet printing, jet cleaning, self-cleaning surfaces, anti-icing, forensic science, and others. This study presents a Volume-of-Fluid (VOF)-based multiphase simulation of a single droplet impacting a hydrophobic solid surface in a quasi-steady air medium at atmospheric pressure. The droplet’s shape transitions from spherical to ellipsoidal (by varying the ratio of major to minor axes) to explore how shape of the droplet affects spreading and retraction dynamics during post-impact. A novel image processing algorithm is introduced to model the dynamic contact angle (DCA). Present study investigates the temporal and spatial evolution of spreading factor, apex height, and shape factor. Using a finite volume-based solver in ANSYS FLUENT, simulations were conducted at specific Weber (We)  and Reynolds (Re) numbers of 10 and 1575, respectively. This research offers unique insights into droplet dynamics and morphology during spreading and retraction, which could enhance understanding of related natural and industrial phenomena.