Effects of Gravitational Force and Surface Orientation on the Jumping Velocity and Energy Conversion Efficiency of Coale
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ORIGINAL ARTICLE
Effects of Gravitational Force and Surface Orientation on the Jumping Velocity and Energy Conversion Efficiency of Coalesced Droplets Xin Wang 1 & Bo Xu 1,2,3 & Zhenqian Chen 1,2,3 & Yang Yang 4 & Qian Cao 4 Received: 19 June 2020 / Accepted: 6 October 2020 # Springer Nature B.V. 2020
Abstract Due to potential applications in numerous fields (self-cleaning, anti-frosting, condensation enhancement, etc.), coalescence-induced droplet jumping has been investigated extensively by numerical simulations and experiments over the past decade. In this paper, the jumping dynamics of coalesced droplets on the microstructured superhydrophobic surfaces is simulated using the lattice Boltzmann model. Effects of gravity, inclined angle and droplet radius ratio on the jumping velocity and energy conversion efficiency are studied. The numerical results demonstrate that jumping droplets on inclined surfaces driven by the tangential gravity can successfully detach from the surface without returning to the original spot. The jumping velocity can be improved by a larger inclined angle. Coalescenceinduced jumping of two-mismatched droplets on the horizontal surface can also produce a horizontal velocity that drives them detaching from the surface along x direction or coalescing with other droplets. Both jumping velocity and energy conversion efficiency are reduced by a lower radius ratio and a larger gravitational coefficient. In addition, no jumping behavior can be observed when energy conversion efficiency is less than 2%. Keywords Lattice Boltzmann method . Inclined angle . Gravity . Droplet jumping
This article belongs to the Topical Collection: The Effect of Gravity on Physical and Biological Phenomena Guest Editor: Valentina Shevtsova Highlights (1) Droplet jumping dynamics on microstructured and inclined surfaces is simulated. (2) Jumping droplets driven by tangential gravity can detach from the surface without returning. (3) Effect of gravity on the jumping behavior should be considered. (4) No jumping behavior can be observed when energy conversion efficiency is less than 2%. * Zhenqian Chen [email protected] 1
2
School of Energy and Environment, Southeast University, Nanjing, People’s Republic of China Jiangsu Provincial Key Laboratory of Solar Energy Science and Technology, School of Energy and Environment, Southeast University, Nanjing, People’s Republic of China
3
Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, People’s Republic of China
4
Engineering and technology center for space applications, Chinese academy of sciences, Beijing, People’s Republic of China
Microgravity Sci. Technol.
Introduction The phenomena of self-propelled droplet movement have attracted much attention in recent years due to the potential applications in the fields of self-cleaning (Wisdom et al. 2013), anti-icing (Boreyko and Collier 2013; Xu et al. 2014), defrosting (Chu et al. 2017; Hou et al. 2018) microfluidic systems
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