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Journal of Thermal Analysis and Calorimetry

, Volume 135, Issue 3, pp 1753–1762 | Cite as

An experimental study of the nanofluid pool boiling on the aluminium surface

  • Ahmad NazariEmail author
  • Seyfolah Saedodin
Article

Abstract

Nucleate boiling due to use latent heat instead of sensible heat has an extra potential for dissipating high heat flux, but it needs to control critical heat flux. On the other hand, it is well known that nucleate boiling is strongly under the influence characteristics of surface. One of the methods to control critical heat flux is to change surface characteristics by nanofluid pool boiling. In this study, nanofluids which contain aluminium oxide nanoparticles with four different levels of concentration including 0.002, 0.01, 0.05 and 0.1 vol% were used for pool boiling tests at the atmospheric pressure. Tests showed that generally to add nanoparticles will cause the critical heat flux increase and at the certain concentrations about 0.01 vol%, critical heat flux has maximum enhancement about 19%. In this research, additionally, the effects of surface parameters such as wettability, roughness and thickness of deposited nanoparticles on the critical heat flux have been analysed.

Keywords

Critical heat flux Pool boiling Nanofluids Wettability 

List of symbols

g (m s−2)

Acceleration of gravity

ρ (kg m−3)

Density

ρl (kg m−3)

Liquid density

ρg (kg m−3)

Vapour density

σ (N m−1)

Surface tension

hfg (J kg−1)

Latent heat of evaporation

K (W m−1K−1)

Thermal conductivity

\(q^{\prime \prime }\) (W m−2)

Heat flux

vol%

Volume per cent

ΔTsat (K)

Wall superheat temperature

θ (deg)

Contact angle

CHF (W m−2)

Critical heat flux

DW

Deionized water

Tw (K)

Surface temperature

\(\gamma_{\text{sl}}\) (N m−1)

Surface energy of solid–liquid

\(\gamma_{\text{sv}}\) (N m−1)

Surface energy of solid–liquid

T1 (K)

Bulk temperature of liquid

T2 (K)

Temperature of the first thermocouple in the conduction block

T3 (K)

Temperature of the second thermocouple in the conduction block

T4 (K)

Temperature of the third thermocouple in the conduction block

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2018

Authors and Affiliations

  1. 1.Department of Mechanical and Mechatronics EngineeringShahrood University of TechnologyShahroodIran
  2. 2.Department of Mechanical EngineeringSemnan UniversitySemnanIran

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