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Nucleate boiling of water using nanostructured surfaces

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Abstract

The aim of this study was to analyze the effect of nanostructured surfaces on the nucleate boiling of distilled water at saturation temperature and atmospheric pressure. The nanostructures studied consisted of nanoparticles of molybdenum (obtained by the sputtering method) and of maghemite, deposited on a substrate of very thin Constantan tape. The results obtained with the nanostructures were compared with experimental data for smooth and rough tapes (substrate). The nanostructures increased the surface wettability, especially in the case of the maghemite deposition, and consequently increased the critical heat flux values. An increase in the heat transfer coefficient was observed only for high heat fluxes. The measurement of the apparent contact angle showed that the rough substrates are highly hydrophobic and enhance the heat transfer coefficient.

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Abbreviations

CHF:

Critical heat flux

SEM:

Scanning electron microscopy

AFM:

Atomic force microscopy

Sccm:

Cubic centimeter per minute

h :

Heat transfer coefficient (kW/m2K)

h lv :

Latent heat of vaporization (kJ/kg)

q″:

Heat flux (kW/m2)

R :

Electrical resistance (Ω)

R a :

Average roughness (μm)

T sat :

Saturation temperature of the fluid (°C)

T w :

Surface temperature (°C)

V :

Volume (m3)

I :

Electrical current (A)

A :

Heated surface area (m2)

e :

Nominal deposited layer thickness (m)

m :

Mass (kg)

θ :

Apparent contact angle (°)

ρ :

Density (kg/m³)

σ :

Surface tension (N/m)

ν :

Specific volume (m³/kg)

a:

Advancing

r:

Receding

l:

Liquid

v:

Vapor

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Acknowledgments

The authors gratefully acknowledge the support of CAPES (PROENG, NANOBIOTEC and PNPD Projects) and CNPq (Project of the UNIVERSAL Edital) and Mrs. Maria de Fátima da Silva and Mr. Marcelo Parise from NFA/Instituto de Física/Universidade de Brasília for supplying the nanoparticles. The authors also extend their gratitude to Mr. A. J. C. Pacheco, Mr. A. Oliveira and Ms. B. C. P. Morastoni for their important contribution to the laboratory work.

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Correspondence to J. C. Passos.

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Technical Editor: Fernando Alves Rochinha.

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Heitich, L.V., Passos, J.C., Cardoso, E.M. et al. Nucleate boiling of water using nanostructured surfaces. J Braz. Soc. Mech. Sci. Eng. 36, 181–192 (2014). https://doi.org/10.1007/s40430-013-0058-2

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  • DOI: https://doi.org/10.1007/s40430-013-0058-2

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