Dynamic behavior of non-evaporative droplet impact on a solid surface: Comparative study of R113, water, ethanol and acetone

Tian, Jing; Chen, Bin

doi:10.1016/j.expthermflusci.2019.03.024

Cited by 27 publications

(33 citation statements)

References 48 publications

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“…The value of the relative error of We number was calculated by the equation, Δ We / We = Δ D 0 / D 0 + 2Δ U 0 / U 0 to be 12.8%. 59 The angle deviation of the SAW device holder was ±0.3°.…”

Section: Experimental Methods and Sample Preparationmentioning

confidence: 99%

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Dynamic Behavior of Droplet Impact on Inclined Surfaces with Acoustic Waves

et al. 2020

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Droplet impact on arbitrary inclined surfaces is of great interest for applications such as antifreezing, self-cleaning, and anti-infection. Research has been focused on texturing the surfaces to alter the contact time and rebouncing angle upon droplet impact. In this paper, using propagating surface acoustic waves (SAWs) along the inclined surfaces, we present a novel technique to modify and control key droplet impact parameters, such as impact regime, contact time, and rebouncing direction. A high-fidelity finite volume method was developed to explore the mechanisms of droplet impact on the inclined surfaces assisted by SAWs. Numerical results revealed that applying SAWs modifies the energy budget inside the liquid medium, leading to different impact behaviors. We then systematically investigated the effects of inclination angle, droplet impact velocity, SAW propagation direction, and applied SAW power on the impact dynamics and showed that by using SAWs, droplet impact on the nontextured hydrophobic and inclined surface is effectively changed from deposition to complete rebound. Moreover, the maximum contact time reduction up to ∼50% can be achieved, along with an alteration of droplet spreading and movement along the inclined surfaces. Finally, we showed that the rebouncing angle along the inclined surface could be adjusted within a wide range.

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Section: Experimental Methods and Sample Preparationmentioning

confidence: 99%

“…The results of Figure S3b in the Supporting Information shows that the uncertainty of the impact velocity was ±4.5%. The value of the relative error of We number was calculated by the equation, Δ We / We = Δ D 0 / D 0 + 2Δ U 0 / U 0 to be 12.8% . The angle deviation of the SAW device holder was ±0.3°.…”

Section: Experimental Methods and Sample Preparationmentioning

confidence: 99%

Dynamic Behavior of Droplet Impact on Inclined Surfaces with Acoustic Waves

et al. 2020

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“…To this end, we have shown that the QFDD starting from the Townes states can produce rich dynamical phases including the deposition, recoiling and splashing, which perfectly mimic the droplet impact outcomes as studied in literature [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. However, different from these literal studies, the driving force of QFDD is purely given by quantum fluctuations (in terms of LHY correction), whose strength can be easily tuned by the size (σ 0 ) and the number (N ) of initial state.…”

mentioning

confidence: 90%

“…The first systematic study of droplet impact dynamics can be traced back to the 19th century by Worthington [12,13]. Since then such intriguing phenomenon has intrigued great attention and various impact outcomes, including splashing, receding/recoiling, rebound and deposition, have been observed successfully in experiments [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. In general, there are two important physical observables in these studies, namely, the maximum spreading factor (β) [16,20,27] and the splashing threshold(K) [15, 17-19, 21-26, 29], which have been shown to not only depend on the properties of droplet itself (size, density, surface tension, viscosity, impact velocity), but also closely reply on the surface condition(roughness, wettability) and surrounding gas (pressure, composition).…”

mentioning

confidence: 99%

Quantum-Fluctuation-Driven Dynamics of Droplet Splashing, Recoiling and Deposition in Ultracold Binary Bose Gases

Ma¹,

Cui²

2022

Preprint

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Droplet impact on a surface is closely tied to a diverse field of nature and practical applications, while a complete control of its outcomes remains challenging due to various unmanageable factors related to droplet, surface and surrounding environment. In this work, we propose the quantum simulation of droplet impact dynamics in the platform of ultracold atoms. Specifically, we study the quantum-fluctuation-driven dynamics(QFDD) of two-dimensional Bose-Bose mixtures from an initial Townes soliton towards the formation of quantum droplet. By tuning the fluctuation energy of initial Townes state through its size and number, the subsequent QFDD can exhibit distinct outcomes including splashing, recoiling and deposition, thereby well simulating the droplet impact dynamics. We have utilized the Weber number to identify the thresholds of splashing and recoiling, and further established a universal scaling law between the maximum spreading factor and the Weber number in recoiling regime. In addition, we show the residual QFDD in deposition regime can be used to probe the collective breathing modes of quantum droplet. Our results, which can be directly tested in cold atoms experiments, pave the way for exploring the intriguing droplet dynamics in a clean and fully controlled quantum setting.

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“…In terms of jet cooling, Haixiang Zhang et al paid attention to the effect of surface wettability on water droplet spreading and splashing [8]. Tian, J. and Chen, B compared the different effects of droplet diameter, impact velocity, viscosity and surface tension on the impaction [9]. In terms of evaporative cooling, Zang [10], Sazhin [11], Volkov [12] and Strizhak [13] did a large amount of work on the dynamic model.…”

Section: Introductionmentioning

confidence: 99%

Application of Ultrasonic Atomization in a Combined Circulation System of Spray Evaporative Cooling and Air Cooling for Electric Machines

Wang

Ruan

2021

Processes

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A combined circulation system of spray evaporative cooling and air cooling (CCSSECAC) is a way to enhance the cooling performance of an air-cooled electric machine while maintaining its existing structure. Based on a traditional air-cooled machine, when the discrete evaporative cooling medium particles are scattered into the airflow, they will reach the heat source with the air circulation. The cooling capacity of the cooling system is enhanced simultaneously through the phase transition and convection heat transfer. Ultrasonic atomization is a simple way to produce tiny droplets and a good way to improve the performance of CCSSECAC. To verify the effectiveness of such a system, a principle test model was built and a multi-operational condition experiment was carried out as an exploratory study. The experimental results showed that the new cooling system was feasible for horizontal machines, and the stator coil temperature was significantly reduced compared with the air-cooled mode.

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Dynamic behavior of non-evaporative droplet impact on a solid surface: Comparative study of R113, water, ethanol and acetone

Cited by 27 publications

References 48 publications

Dynamic Behavior of Droplet Impact on Inclined Surfaces with Acoustic Waves

Dynamic Behavior of Droplet Impact on Inclined Surfaces with Acoustic Waves

Quantum-Fluctuation-Driven Dynamics of Droplet Splashing, Recoiling and Deposition in Ultracold Binary Bose Gases

Application of Ultrasonic Atomization in a Combined Circulation System of Spray Evaporative Cooling and Air Cooling for Electric Machines

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