Water droplet dynamics on a heated nanowire surface

Auliano, Manuel; Auliano, Damiano; Fernandino, María; Zhang, Peng; Dorao, Carlos Alberto

doi:10.1063/1.5067399

Cited by 12 publications

(6 citation statements)

References 16 publications

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“…Above ∼10 μm spacing, the T LFP increased as post spacing became sparser, we found that with increasing the spacings above ∼10 μm, our experimental results agree with those similar to previously established results, increasing the trend of T LFP for gentle deposition on microstructures. , However, intriguingly we found that by decreasing post spacings below ∼10 μm, T LFP increased again with the minima for the T LFP occurring at a spacing of approximately 10 μm. We also see that the maximum T LFP below 10 μm spacing is observed for the nanograss sample in line with previous reports showing similar behavior for nanotubes , and nanopillars. , These results thus suggest a crucial connection between T LFP on microstructures expanding upon limited previous work that reported high Leidenfrost temperatures for rough surfaces and porous materials …”

Section: Resultssupporting

confidence: 92%

Boiling Transitions During Droplet Contact on Superheated Nano/Micro-Structured Surfaces

Saneie

Kulkarni

Fezzaa

et al. 2022

ACS Appl. Mater. Interfaces

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Manipulating surface topography is one of the most promising strategies for increasing the efficiency of numerous industrial processes involving droplet contact with superheated surfaces. In such scenarios, the droplets may immediately boil upon contact, splash and boil, or could levitate on their own vapor in the Leidenfrost state. In this work, we report the outcomes of water droplets coming in gentle contact with designed nano/ microtextured surfaces at a wide range of temperatures as observed using high-speed optical and X-ray imaging. We report a paradoxical increase in the Leidenfrost temperature (T LFP ) as the texture spacing is reduced below a critical value (∼10 μm) that represents a minima in T LFP . Although droplets on such textured solids appear to boil upon contact, our studies suggest that their behavior is dominated by hydrodynamic instabilities implying that the increase in T LFP may not necessarily lead to enhanced heat transfer. On such surfaces, the droplets display a new regime characterized by splashing accompanied by a vapor jet penetrating through the droplets before they transition to the Leidenfrost state. We provide a comprehensive map of boiling behavior of droplets over a wide range of texture spacings that may have significant implications toward applications such as electronics cooling, spray cooling, nuclear reactor safety, and containment of fire calamities.

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Section: Resultssupporting

confidence: 92%

Boiling Transitions During Droplet Contact on Superheated Nano/Micro-Structured Surfaces

Saneie

Kulkarni

Fezzaa

et al. 2022

ACS Appl. Mater. Interfaces

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“…It is known, that the droplet has its longest evaporation time at Leidenfrost point (T L ). [47] When the substrate temperature is higher than T L , the droplet enters into the Leidenfrost regime (Figure 4l). As shown in Figure S17, the droplet undergoing the Leidenfrost effect at 140 °C bounces without wetting the substrate because of the levitation force generated by the rapid formation of a vapor layer between the droplet and the overheated substrate (Figure 4m-III).…”

Section: Methodsmentioning

confidence: 99%

Tuning the Stacking Modes of Ultrathin Two‐Dimensional Metal–Organic Framework Nanosheet Membranes for Highly Efficient Hydrogen Separation

Song,

Wang,

Zhao

et al. 2023

Angew Chem Int Ed

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Two‐dimensional (2D) metal‐organic framework (MOF) membranes are considered potential gas separation membranes of the next generation due to their structural diversity and geometrical functionality. However, achieving a rational structure design for a 2D MOF membrane and understanding the impact of MOF nanosheet stacking modes on membrane separation performance remain challenging tasks. Here, we report a novel kind of 2D MOF membrane based on [Cu2Br(IN)2]n (IN = isonicotinato) nanosheets and propose that synergetic stacking modes of nanosheets have a significant influence on gas separation performance. The stacking of the 2D MOF nanosheets is controlled by solvent droplet dynamic behaviors at different temperatures of drop coating. Our 2D MOF nanosheet membranes exhibit high gas separation performances for H2/CH4 (selectivity > 290 with H2 permeance > 520 GPU) and H2/CO2 (selectivity > 190 with H2 permeance > 590 GPU) surpassing the Robeson upper bounds, paving a potential way for eco‐friendly H2 separation.

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“…Recently, the LFP shift of water droplet observed on titanium oxide nanotubes was attributed to the induced capillary pressure . Moreover, recently, we concluded that a super nanowicking surface will allow maximizing the cooling in the transition boiling region because of the lift-off process and suppressing the Leidenfrost phenomenon even at higher temperatures …”

Section: Introductionmentioning

confidence: 92%

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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Water droplet dynamics on a heated nanowire surface

Cited by 12 publications

References 16 publications

Boiling Transitions During Droplet Contact on Superheated Nano/Micro-Structured Surfaces

Boiling Transitions During Droplet Contact on Superheated Nano/Micro-Structured Surfaces

Tuning the Stacking Modes of Ultrathin Two‐Dimensional Metal–Organic Framework Nanosheet Membranes for Highly Efficient Hydrogen Separation

Can Wicking Control Droplet Cooling?

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