Boiling Enhancement on Nanostructured Surfaces with Engineered Variations in Wettability and Thermal Conductivity

Rahman, Mahamudur; McCarthy, Matthew

doi:10.1080/01457632.2016.1242961

Cited by 68 publications

(30 citation statements)

References 23 publications

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“…This is because the HTC is usually improved by promoting the nucleation of boiling bubbles on the heating surface, which tends to decrease the CHF (Hsu and Chen, 2012). Therefore, localized nanostructures (Rahman and McCarthy, 2017) and hierarchically structured surfaces (Chu et al, 2013) have been fabricated on heating surfaces to simultaneously improve the CHF and HTC. In addition, inversion of the boiling curve (Jaikumar and Kandlikar, 2017) has been achieved by controlling the behavior of boiling bubbles by separating nucleating regions and the paths of liquid supply (Kandlikar, 2017).…”

Section: In a Boiling Bubble Resonatormentioning

confidence: 99%

Effect of the gap height between the vibration plate and heating surface on boiling heat transfer in a boiling bubble resonator

Unno

Yuki

Taniguchi

et al. 2021

JTST

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Section: In a Boiling Bubble Resonatormentioning

confidence: 99%

Effect of the gap height between the vibration plate and heating surface on boiling heat transfer in a boiling bubble resonator

Unno

Yuki

Taniguchi

et al. 2021

JTST

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“…The wicked volume flux is a phenomenological parameter used to characterize the wickability of structured surfaces. The measurement of the wicked volume flux and the development of a wicking-enhanced CHF model for structured superhydrophilic surfaces have been described in previous publications [7,21]. Using this approach, it can be seen that the model developed by Rahman et al accurately predicts CHF enhancement on the CuO surfaces during pool boiling of saturated water at atmospheric conditions [7].…”

Section: Resultsmentioning

confidence: 99%

“…Each fabricated surface has been characterized during pool boiling using a custom built experimental apparatus. Complete details of the boiling apparatus, experimental methods, and measurement uncertainties can be found in prior publications [5][6][7]21]. Briefly, each sample has been characterized up to CHF during pool boiling of saturated water at atmospheric conditions.…”

Section: Experimental Characterizationmentioning

confidence: 99%

Effect of Length Scales on the Boiling Enhancement of Structured Copper Surfaces

Rahman

McCarthy

2017

Journal of Heat Transfer

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Boiling heat transfer can be substantially altered with the addition of surface structures. While significant enhancements in critical heat flux (CHF) and heat transfer coefficient (HTC) have been demonstrated using this approach, fundamental questions remain about the nature of enhancement and the role of structure length scale. This work presents a systematic investigation of structures from 100's of nanometers to several millimeters. Specifically, copper substrates were fabricated with five different microchannel geometries (characteristic lengths of 300 μm to 3 mm) and four different copper oxide nanostructured coatings (characteristic lengths of 50 nm to 50 μm). Additionally, twenty different multiscale structures were fabricated coinciding with each permutation of the various microchannels and nanostructures. Each surface was tested up to CHF during pool boiling of saturated water at atmospheric conditions. The nanostructured coatings were observed to increase CHF via surface wicking, consistent with existing models, but decrease HTC due to the suppression of the nucleation process. The microchannels were observed to increase both CHF and HTC, generally outperforming the nanostructured coatings. The multiscale surfaces exhibited superior performance, with CHF and HTC values as high as 313 W/cm2 and 461 kW/m2 K, respectively. Most importantly, multiscale surfaces were observed to exhibit the individual enhancement mechanisms seen from each length scale, namely, increased nucleation and bubble dynamics from the microchannels and wicking-enhanced CHF from the nanostructures. Additionally, two of the surfaces tested here exhibited uncharacteristically high HTC values due to a decreasing wall superheat at increasing heat fluxes. While the potential mechanisms producing this counterintuitive behavior are discussed, further research is needed to definitively determine its cause.

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“…Takata et al 17 showed the enhancement of nucleate boiling heat transfer from a copper surface with SWR coating in comparison with normal copper surface. Rahman et al 18 showed that heterogeneous surface with nano-structured coating has increased the CHF 2.6 times as compared to bare copper substrates. MD simulations have also been performed on thin film evaporation over patterned surface.…”

Section: Introductionmentioning

confidence: 99%

Molecular dynamics study on the effect of hydrophilicity on thin film evaporation over biphilic surface

Paul

Rownak

Hasan

2020

Proceedings of the Institution of Mechanical Engineers, Part N:

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The objective of this study is to understand the effect of surface wettability and how nano-scale heat transfer is affected by different surface wetting conditions over biphilic surface by molecular dynamics simulations. The system of 3 nm liquid Argon film over Platinum surface is equilibrated at 90 K and then wall temperature is raised to higher value to study the effect of temperature. According to this study at low wall temperature and low surface wetting conditions, liquid temperature increases proportionally with the increment of hydrophilic portion but at higher wall temperature and better surface wetting conditions, maximum value of liquid Argon temperature increases with increasing hydrophobic portion. Evaporation number, evaporative mass flux and heat flux increase significantly with slight increment of hydrophilic portion. Inception time decreases with increasing hydrophilic portion and surface wettability. Also, for better surface wetting conditions, average evaporative mass flux is more sensitive to wall temperature and increases significantly at higher wall temperature.

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Boiling Enhancement on Nanostructured Surfaces with Engineered Variations in Wettability and Thermal Conductivity

Cited by 68 publications

References 23 publications

Effect of the gap height between the vibration plate and heating surface on boiling heat transfer in a boiling bubble resonator

Effect of the gap height between the vibration plate and heating surface on boiling heat transfer in a boiling bubble resonator

Effect of Length Scales on the Boiling Enhancement of Structured Copper Surfaces

Molecular dynamics study on the effect of hydrophilicity on thin film evaporation over biphilic surface

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