Effects of droplet diameter on the Leidenfrost temperature of laser processed multiscale structured surfaces

Hassebrook, Anton; Kruse, Corey; Wilson, Chris; Anderson, Troy D.; Zuhlke, Craig; Alexander, Dennis R.; Gogos, George; Ndao, Sidy

doi:10.1109/itherm.2014.6892316

Cited by 6 publications

(4 citation statements)

References 25 publications

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“…where is the evaporation time before correction; D0, present, the droplet diameter in this study; and D0, previous, the droplet diameter in previous studies. Figure 4 shows that the experimental results of the present study agree well with the results of previous studies near the LFP [16,27]. Comparison of evaporation time with those in previous studies [16,27].…”

Section: Validationsupporting

confidence: 90%

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Effect of Surface Textures and Wettability on Droplet Impact on a Heated Surface

Ogata

Nakanishi

2021

Processes

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A liquid droplet can hover over a solid surface that is heated above the Leidenfrost point (LFP), at which an insulating vapor layer is formed that acts as a heat transfer barrier. Recent studies have reported that hierarchical micro- and nanoscale textures provide high wettability and significant LFP enhancement. However, such textures are often difficult and expensive to fabricate. Therefore, this study aimed to experimentally demonstrate LFP enhancement through the use of low-cost hierarchical textures. Surface textures were fabricated by coating SiO2 nanoparticles on stainless steel wire meshes. The droplet lifetime method was used to determine the LFP in a temperature range of 200 °C–490 °C. High-speed imaging (4000–23,000 fps) was performed for visualizing the impact behavior of a droplet. The LFP value of the nanocoated mesh surface was found to be greater than 490 °C. This enhanced LFP was 178 °C higher than that of a stainless steel surface and 38 °C higher than that of a single-layer textured surface. Furthermore, with respect to the LFP enhancement, the explosive impact behavior of a droplet can be observed on nanocoated mesh surfaces.

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Section: Validationsupporting

confidence: 90%

“…To assess the validity of this experiment, preliminary experiments were conducted under the conditions shown in Table 2 for comparison with the results of conventional studies [16,27]. Table 2 also shows the conventional experimental conditions.…”

Section: Validationmentioning

confidence: 99%

Effect of Surface Textures and Wettability on Droplet Impact on a Heated Surface

Ogata

Nakanishi

2021

Processes

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“…Indeed, although Hassebrook et al 63 reported a linear trend of the LFP versus the droplet size for the same processed surface (see Figure S12 in the Supporting Information), this might not hold for all of the micro-/nanostructures and the droplet weight could not be the dominant contribution to the LFP shift (as discussed in subsection validation (S3) in the Supporting Information). Moreover, the effect of the gravity was not considered in the physical model proposed by Kwon et al 13 The deviation of the predictions from the experimental results was attributed mainly to a dependence of the contact patch length (assumed constant for all of the structures) on the pitch between the pillars.…”

mentioning

confidence: 95%

Can Wicking Control Droplet Cooling?

Auliano

Fernandino

et al. 2019

Langmuir

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Wicking, defined as absorption and passive spreading of liquid into a porous medium, has been identified as a key mechanism to enhance the heat transfer and prevent the thermal crisis. Reducing the evaporation time and increasing the Leidenfrost point (LFP) are important for an efficient and safe design of thermal management applications, such as electronics, nuclear, and aeronautics industry. Here, we report the effect of the wicking of superhydrophilic nanowires (NWs) on the droplet vaporization from low temperatures to temperatures above the Leidenfrost transition. By tuning the wicking capability of the surface, we show that the most wickable NW results in the fastest evaporation time (reduction of 82, 76, and 68% compared with a bare surface at, respectively, 51, 69, and 92 °C) and in one of the highest shifts of the LFP of a water droplet (5 μL) in the literature (about 260 °C).

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“…The Leidenfrost temperature depends many characteristics such as the surface characteristics 9 , liquid properties 12 , drop size 13 , and impact condition 14 . Among these factors, engineering the surface characteristics has emerged as the most promising method of increasing the Leidenfrost temperature owing to its substantial tunability.…”

Section: Introductionmentioning

confidence: 99%

Suppression of the Leidenfrost Phenomenon by Superhydrophilic Graphene Nanobush

Chen,

Wang,

Zhu

et al. 2024

Preprint

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The Leidenfrost phenomenon considerably reduces the heat transfer at high temperatures, but proper micro/nanofabrication can enhance the heat transfer by elevating the Leidenfrost temperature. However, the complicated micro/nanofabrication techniques are difficult to implement in large-scale commercial applications. This paper describes superhydrophilic graphene nanobush (SGNB) on Cu plates prepared by the PECVD method and subsequent air plasma etching that improves the spray cooling heat transfer. The results show that the Leidenfrost temperature of SGNB/Cu plate is up to 240 °C greater than that of a bare Cu surface. The much higher temperature on the SGNB/Cu surface is due to the fast water wicking and spreading by the nanobush superhydrophilicity, as well as increased heat transfer area, increased number of boiling nucleation sites and the robust vapor channels provided by the porous nanobush structure. This study shows the great ability of the nanobush for enhancing the boiling heat transfer and a feasible strategy for suppressing the Leidenfrost phenomenon.

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Effects of droplet diameter on the Leidenfrost temperature of laser processed multiscale structured surfaces

Cited by 6 publications

References 25 publications

Effect of Surface Textures and Wettability on Droplet Impact on a Heated Surface

Effect of Surface Textures and Wettability on Droplet Impact on a Heated Surface

Can Wicking Control Droplet Cooling?

Suppression of the Leidenfrost Phenomenon by Superhydrophilic Graphene Nanobush

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