Water drop impact on a semi-cylindrical convex hot surface for a diameter ratio of unity

Jowkar, Saeed; Morad, Mohammad Reza

doi:10.1016/j.expthermflusci.2019.03.023

Cited by 14 publications

(3 citation statements)

References 43 publications

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“…2017; Li et al. 2018; Jowkar & Morad 2019). Changes in the surface curvature strongly influence the jetting instants and droplet deformation (Hardalupas, Taylor & Wilkins 1999; Burson-Thomas et al.…”

Section: Introductionmentioning

confidence: 99%

“…Hence, it is necessary to provide an exhaustive analysis of the surface geometrical effect during high-speed droplet impingement. Increasing attention has recently been paid to the effect of droplet impingement on different forms of impacted surfaces, especially concave and convex surfaces, which showed that the surface profiles might strongly influence the dynamics of impinging droplets (Charalampous & Hardalupas 2017;Liu et al 2017;Khojasteh et al 2017;Zhu et al 2017;Li et al 2018;Jowkar & Morad 2019). Changes in the surface curvature strongly influence the jetting instants and droplet deformation (Hardalupas, Taylor & Wilkins 1999;Burson-Thomas et al 2019a), which may have a significant effect on the final surface damage.…”

Section: Introductionmentioning

confidence: 99%

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Curved surface effect on high-speed droplet impingement

Liu

Wang

2020

J. Fluid Mech.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Curved surface effect on high-speed droplet impingement

Liu

Wang

2020

J. Fluid Mech.

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“…Another approach to decrease the contact time is droplet impact on curved smooth surfaces. The droplet symmetry can also be altered by impacting on cylindrically curved surfaces [28][29][30]. For example, Liu et al [31] numerically and experimentally investigated the droplet impact on convex/concave surfaces.…”

Section: Introductionmentioning

confidence: 99%

Acoustic Waves for Active Reduction of Contact Time in Droplet Impact

Biroun

Tao

et al. 2020

Phys. Rev. Applied

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Minimising droplet impact contact time is critical for applications such as self-cleaning, antierosion or anti-icing. Recent studies have used texturing of surfaces to split droplets during impact or inducing asymmetric spreading, but these require specifically designed substrates which cannot be easily reconfigured. A key challenge is to realise an effective reduction in contact time during droplet impingement on a smooth surface without texturing but with an active and programmable control. Our experimental results show that surface acoustic waves (SAWs), generated at a location distant from a point of droplet impact, can be used to minimise contact time by as much as 35% without requiring a textured surface. Besides, the ability to switch on and off the SAWs means that reduction in droplet impact contact time on a surface can be controlled in a programmable manner. Moreover, our results show that by applying acoustic waves, the impact regime of the droplet on the solid surface can be changed from deposition or partial rebound to complete rebound. To study the dynamics of the droplet impact, we developed a numerical model for the multi-phase flow and simulated different droplet impingement scenarios. Numerical results revealed that the acoustic waves could be used to modify and control the internal velocity fields inside the droplet. By breaking the symmetry of the internal recirculation patterns inside the droplet, the kinetic energy recovered from interfacial energy during the retraction process is increased, and the droplet can be fully separated from the surface with a much shorter contact time. Our work opens up opportunities to use SAW devices to minimise the contact time, change the droplet impact regime and program/control the droplet's rebounding on smooth/planar and curved surfaces as well as rough/textured surfaces.

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Dynamics Behaviors of Droplets Impacting on a Heated Tailings Surface

Zhao

et al. 2022

The Minerals, Metals &Amp; Materials Series

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Water drop impact on a semi-cylindrical convex hot surface for a diameter ratio of unity

Cited by 14 publications

References 43 publications

Curved surface effect on high-speed droplet impingement

Curved surface effect on high-speed droplet impingement

Acoustic Waves for Active Reduction of Contact Time in Droplet Impact

Dynamics Behaviors of Droplets Impacting on a Heated Tailings Surface

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