Critical heat flux maxima during boiling crisis on textured surfaces

Dhillon, Navdeep Singh; Buongiorno, Jacopo; Varanasi, Kripa K.

doi:10.1038/ncomms9247

Cited by 352 publications

(162 citation statements)

References 54 publications

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“…We can explain this phenomenon by the fact that microropes are not perpendicular to the surface, and have a different angle of inclination. In addition, it was observed that the droplets on the surface have a very large imbibition layer [11]. We assume that water penetrate easily into grooves constituting the relief in case of Cassie impregnating wetting [12].…”

Section: Resultsmentioning

confidence: 99%

Influence of thin fluoropolymer film deposition on wettability of the silicon oxide nanowires array

et al. 2016

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Abstract. In this work, we studied influence of fluoropolymer thin film deposition on wettability of the silicon oxide nanowires array. Deposition of fluoropolymer coating on the silicon oxide nanowires array changes the surface properties from hydrophilic to hydrophobic, and micro and nano scale surface roughness does not change significantly. In addition, it was shown that the deposition of fluoropolymer coating on nanowires protects the nanostructures from bundling together as a result of the attractive capillary forces that arise during evaporative drying.

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Section: Resultsmentioning

confidence: 99%

Influence of thin fluoropolymer film deposition on wettability of the silicon oxide nanowires array

et al. 2016

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“…This reduction in solid-liquid contact area means that the heat flux required to generate the supporting vapour layer required for a Leidenfrost state has to be transferred through the reduced contact area between the liquid and the solid wires. This would mean that a higher temperature is needed for the required heat flux to generate a continuous vapour and so produce a Leidenfrost state [21][22][23][24]. Figure 2(b), degrades the fit, suggesting that this area is not a significant factor.…”

Section: Meshmentioning

confidence: 99%

Leidenfrost transition temperature for stainless steel meshes

Geraldi

McHale

et al. 2016

Materials Letters

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(2016) 'Leidenfrost transition temperature for stainless steel meshes. ', Materials letters., Further information on publisher's website: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. AbstractOn surfaces well above 100°C water does not simply boil away. When there is a sufficient heat transfer between the solid and the liquid a continuous vapour layer instantaneous forms under a droplet of water and the drop sits on a cushion of vapour, highly mobile and insulated from the solid surface. This is known as the Leidenfrost effect and the temperature at which this occurs if known as the Leidenfrost transition temperature. In this report, an investigation of discontinuous surfaces, stainless steel meshes, have been tested to determine the effect of the woven material on the Leidenfrost phenomenon. . This allows suppression of the Leidenfrost effect as it can be increase to over 300°C from 185°C for a stainless steel surface. Graphical Abstract Introduction

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“…Extensive research works have been carried out for improving boiling heat transfer performance, and they are generally classified into active, passive, and compound techniques [6]. The passive heat transfer enhancement techniques are usually used for improving the boiling heat transfer performance, because by using (2) where D d is the departure diameter, ∅ is the receding contact angle, γ is the surface tension, g is the acceleration due to gravity, and ρ L and ρ G are the liquid and vapor density, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…Phase change heat transfer systems, such as pool and flow boiling heat sinks, are used extensively in the fields of refrigeration, air conditioning, and electronic devices cooling [1][2][3]. During the boiling heat transfer, the working fluid can absorb a large amount of heat with a small wall superheat due to its large latent heat of vaporization [4,5].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Effect of Size and Pitch of Hydrophobic Square Patterns on the Pool Boiling Heat Transfer Performance of Cylindrical Copper Surface

et al. 2018

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Abstract:In this work, pool boiling heat transfer tests were conducted for investigating the effects of the size and pitch of the hydrophobic square patterns on a copper test piece with the following dimensions: 40 mm long, 25 mm outer diameter, and 18 mm inner diameter. The size of the square patterns and the pitch were varied with an increment of 0.5 mm from 1 mm to 3 mm and from 4.5 to 5.5 mm, respectively. Among the various square patterns of different size and pitch, the 2 mm size square pattern with 5 mm pitch (inter-distance 3 mm) was found to be the best because it gives the advantage of bubble coalescence behavior and also the rewetting phenomenon. The observed bubble departure diameter was 2.35 mm, and using this diameter, we predicted the maximum inter-distance between the patterns for producing inter coalescence of bubbles in the axial direction was 3.12 mm. Therefore, a side-by-side distance of 3 mm, which was closed to the estimated inter-distance graphically, can avoid the earlier inter coalescence of the bubbles between patterns on the surface in the axial direction. This results in better pool boiling heat transfer performance. Highlights: (1) Heterogeneous wettable structures were obtained on the copper surface using screen printing techniques; (2) The effect of the size and pitch of the hydrophobic patterns on the bubble dynamics was determined; (3) The wall superheats of all the heterogeneous wettable surfaces were less than the plain copper surface; (4) The highest heat transfer coefficient was obtained from the hydrophobic pattern with 2 mm size and 5 mm pitch.

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Critical heat flux maxima during boiling crisis on textured surfaces

Cited by 352 publications

References 54 publications

Influence of thin fluoropolymer film deposition on wettability of the silicon oxide nanowires array

Influence of thin fluoropolymer film deposition on wettability of the silicon oxide nanowires array

Leidenfrost transition temperature for stainless steel meshes

Experimental Investigation on the Effect of Size and Pitch of Hydrophobic Square Patterns on the Pool Boiling Heat Transfer Performance of Cylindrical Copper Surface

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