Investigation on effect of surface properties on droplet impact cooling of cladding surfaces

Wang, Zefeng; Qu, Wenhai; Xiong, Juntao; Zhong, Mingjun; Yang, Yanhua

doi:10.1016/j.net.2019.08.022

Cited by 24 publications

(4 citation statements)

References 24 publications

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“…Some theoretical models have been developed based on the hydrodynamic stability analysis of the vapour/liquid interface 25,26 or thermocapillary stability. 27 Other authors assume that the Leidenfrost temperature is determined by the foam limit 28,29 or by the limiting minimum vapour thickness 30 comparable with the surface roughness. In this study we have demonstrated that the transition to the film boiling regime is initiated at the threshold point for vapour percolation.…”

Section: /10mentioning

confidence: 99%

Thermosuperrepellency of a hot substrate caused by vapour percolation

Schmidt

Hofmann

Tenzer

et al. 2020

Preprint

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Drop rebound after collision with a very hot substrate is usually attributed to the Leidenfrost effect, [1-5] characterized by intensive film boiling in a thin vapour gap between the liquid and substrate. Similarly, drop impact onto a cold superhydrophobic substrate [6-8] leads to a complete drop rebound, despite partial wetting of the substrate. We have studied the repellent properties of hot smooth hydrophilic substrates in the nucleate boiling, non-Leidenfrost regime and discovered that the thermally induced repellency is associated with vapour percolation on the substrate. The wetting structure in the presence of the percolating vapour rivulets is analogous to the Cassie-Baxter wetting mode, [9] which is a necessary condition for the repellency in the isothermal case. The theoretical predictions for the threshold temperature for vapour percolation agree well with the experimental data for drop rebound and correspond to the minimum heat flux when spray cooling.

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Section: /10mentioning

confidence: 99%

Thermosuperrepellency of a hot substrate caused by vapour percolation

Schmidt

Hofmann

Tenzer

et al. 2020

Preprint

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“…Understanding droplet impact behavior onto various surfaces is crucial for a wide range of applications, including 3D and inkjet printing, combustion, spray cooling, anti-icing surfaces, agriculture, forensic assay, and coating processes. − Different factors for controlling droplet impact dynamics on various surfaces have been extensively investigated, including the impact regime, contact time (CT), maximum spreading radius, and rebounding angle. , Advances in smart materials, micro and nanoscale structures, and surface fabrication techniques have led to passive surface modification methods that can be used to modify surfaces for different applications. − For example, hydrophilic surfaces have been made to maximize the contact area upon impact, desirable for coating, flash cooling, and ink-jetting applications. , On the other side of the spectrum, superhydrophobic surfaces are used for anti-icing and anti-erosion applications to reduce the solid–liquid contact time during droplet impact. − However, various problems have been reported for these surfaces, such as three-phase contact line (TPCL) pinning, poor mechanical resilience, degradation of wetting properties over time, or low transparency. − Inspired by the Nepenthes pitcher plant structure, slippery liquid-infused porous surfaces (SLIPS) have been developed to achieve highly smooth and pinning-free surfaces. , SLIPS can be manufactured by imbibing porous and superhydrophobic nanostructures with a lubricating liquid (typically oil), which preferentially wets the solid and is immiscible to the contacting liquid of interest . These surfaces benefit self-cleaning and anti-icing applications as they can reject various impacting liquids, not exclusively water-based. ,, In addition, as long as the lubricant is present and coats the top of the porous medium, the SLIPS’s properties are expected to be sustained .…”

Section: Introductionmentioning

confidence: 99%

Surface Acoustic Waves to Control Droplet Impact onto Superhydrophobic and Slippery Liquid-Infused Porous Surfaces

Biroun

Haworth

Agrawal

et al. 2021

ACS Appl. Mater. Interfaces

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Superhydrophobic coatings and slippery liquid-infused porous surfaces (SLIPS) have shown their potentials in self-cleaning, anti-icing, antierosion, and antibiofouling applications. Various studies have been done on controlling the droplet impact on such surfaces using passive methods such as modifying the lubricant layer thickness in SLIPS. Despite their effectiveness, passive methods lack on-demand control over the impact dynamics of droplets. This paper introduces a new method to actively control the droplet impact onto superhydrophobic and SLIPS surfaces using surface acoustic waves (SAWs). In this study, we designed and fabricated SLIPS on ZnO/aluminum thin-film SAW devices and investigated different scenarios of droplet impact on the surfaces compared to those on similar superhydrophobic-coated surfaces. Our results showed that SAWs have insignificant influences on the impact dynamics of a porous and superhydrophobic surface without an infused oil layer. However, after infusion with oil, SAW energy could be effectively transferred to the droplet, thus modifying its impact dynamics onto the superhydrophobic surface. Results showed that by applying SAWs, the spreading and retraction behaviors of the droplets are altered on the SLIPS surface, leading to a change in a droplet impact regime from deposition to complete rebound with altered rebounding angles. Moreover, the contact time was reduced up to 30% when applying SAWs on surfaces with an optimum oil lubricant thickness of ∼8 μm. Our work offers an effective way of applying SAW technology along with SLIPS to effectively reduce the contact time and alter the droplet rebound angles.

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“…In the application of analytical methods for predicting Leidenfrost temperature, the works by Spiegler et al (1963), Baumeister andSimon (1973), and Wang et al (2020) stand out. In the experimental determination of Leidenfrost temperature, the following works stand out: A) Bernardin and Mudawar (1999), reporting the increase in experimental discrepancies due to the influence of several physical parameters (such as the fluid density, deposition method, thermal properties, surface finish and presence of impurities) and B) Ouattara ( 2009), in the demonstration, through comparative cooling curves between pure water and emulsion, that the Leidenfrost point is delimited by the boundary between transition and boiling film.…”

Section: Introductionmentioning

confidence: 99%

Correlation Between Leidenfrost Temperature, Cooling Capacity and Machining Temperature: An Experimental Study of Cutting Fluids

Gonçalves

Sanchez

Júnior

2021

RETERM

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Much of the energy consumed by machining materials is converted into heat, which causes several technical and economic problems for the process. The cutting fluid application by the conventional method forms a vapor film of low thermal conductivity, which prevents direct contact between the fluid and the heated surface; the so-called Leidenfrost effect, which reduces cooling efficiency. Studies of this phenomenon applied to the machining of materials are still very restricted and scarce. In this sense, the present work experimentally studied the correlation of parameters Leidenfrost temperature, cooling capacity and machining temperatures, applied to the SAE 52100 steel turning process with conventional lubri-coolant, with different cutting fluids. The thermal properties of the studied cutting fluids were taken from the technical-scientific literature. An experimental apparatus was developed for measuring and acquiring machining temperatures. Synthetic cutting fluids were shown to have a better cooling capacity, followed by semi-synthetic fluids and emulsions. There is no relationship between Leidenfrost temperature, cooling capacity, and machining temperatures for the different types of cutting fluids studied.

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Investigation on effect of surface properties on droplet impact cooling of cladding surfaces

Cited by 24 publications

References 24 publications

Thermosuperrepellency of a hot substrate caused by vapour percolation

Thermosuperrepellency of a hot substrate caused by vapour percolation

Surface Acoustic Waves to Control Droplet Impact onto Superhydrophobic and Slippery Liquid-Infused Porous Surfaces

Correlation Between Leidenfrost Temperature, Cooling Capacity and Machining Temperature: An Experimental Study of Cutting Fluids

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