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Liquid/surface interaction during pool boiling of DI-water on nanocoated heating surfaces

  • R. R. Souza
  • L. L. Manetti
  • I. S. Kiyomura
  • E. M. Cardoso
Technical Paper

Abstract

This study focuses on the effect of the nanostructured heating surface on the heat transfer coefficient (HTC) considering the nanofluid concentration used for coating surfaces and the heating surface morphology. Copper blocks with roughness values of Ra = 0.05 μm (smooth surface) and Ra = 0.23 μm (rough surface) were used as heating surfaces, and deionized water (DI-water) at atmospheric pressure and saturation temperature was used as the working fluid. Nanostructured surfaces were obtained by boiling process of Al2O3–DI-water-based nanofluid for different volumetric concentrations 0.0007 vol% and 0.007 vol% (corresponding to low and high nanofluid concentration, respectively) to analyze the interaction between the heating surface and the working fluid. With this purpose, six different copper surfaces were submitted to metallographic, roughness, wettability, and thermal image analysis. The experimental results showed that the enhancement or deterioration of boiling heat transfer is strongly affected by the nanofluid concentration—used to nanocoat the heating surface—and the original heating surface morphology. The nanocoating process increases the surface roughness and changes the surface wettability. Moreover, as the nanofluid concentration increases, the wettability and nanolayer thickness also increase. The wall temperature distribution, obtained by thermal image analysis, agrees with the HTC behavior. For the coated rough surfaces, it is observed deterioration of the HTC regardless of nanofluid concentration. The increase in the surface temperature and the consequent degradation of the HTC are more pronounced for higher nanoparticle concentrations.

Keywords

Pool boiling heat transfer Nanostructured surface Wettability Thermographic analysis 

List of symbols

CHF

Critical heat flux

SEM

Scanning electron microscopy

HTC

Heat transfer coefficient

SS

Smooth surface

RS

Rough surface

h

Heat transfer coefficient (kW/m2 K)

L

Distance between thermocouples (m)

patm

Atmospheric pressure (kPa)

q

Heat flux (kW/m2)

Ra

Average surface roughness (μm)

Ti

Thermocouples temperature at positions 1, 2, and 3 (K)

Tsat

Saturation temperature of the fluid (K)

Tw

Surface temperature (K)

u

Uncertainty (–)

zi

Distance of thermocouples from heating surface (m)

ΔT

Difference in temperature (K)

θ

Static contact angle (°)

Subscripts

1

Location of thermocouple 1

2

Location of thermocouple 2

3

Location of thermocouple 3

w

Surface wall

Notes

Acknowledgements

The authors are grateful for the financial support from the PPGEM—UNESP/FEIS, from CAPES, from the National Counsel of Technological and Scientific Development of Brazil (CNPq Grant No. 458702/2014-5), and from FAPESP (Grant No. 2013/15431-7; 2017/13813-0). The authors also extend their gratitude to Prof. Dr. Gherhardt Ribastki from Heat Transfer Research Group, Escola de Engenharia de São Carlos (EESC)/University of São Paulo, for supplying the alumina nanoparticles.

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Copyright information

© The Brazilian Society of Mechanical Sciences and Engineering 2018

Authors and Affiliations

  • R. R. Souza
    • 1
  • L. L. Manetti
    • 1
  • I. S. Kiyomura
    • 1
  • E. M. Cardoso
    • 1
  1. 1.Post-Graduation Program in Mechanical EngineeringUNESP – São Paulo State UniversityIlha SolteiraBrazil

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