Numerical study of natural convection of ZnO-water nanofluid enclosed between two inclined and concentric hemispheres

The main objective of this paper is to quantify natural convective heat transfer occurring between two concentric hemispheres differentially heated, through a ZnO-Water nanofluid whose volume fraction varies between 0 (pure water) and 10%. The inner active dome is an electronic device generating a c...

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Bibliographic Details
Published in:European physical journal plus 2020-02, Vol.135 (2), p.146, Article 146
Main Authors: Alilat, N., Haddad, O., Baïri, A.
Format: Article
Language:English
Subjects:
Applied and Technical Physics
Aspect ratio
Atomic
Boundary conditions
Cold
Complex Systems
Condensed Matter Physics
Convective heat transfer
Cooling
Domes (structural forms)
Finite volume method
Free convection
Heat conductivity
Heat flux
Heat transfer
Hemispheres
Horizontal orientation
Mathematical and Computational Physics
Molecular
Nanofluids
Nanoparticles
Optical and Plasma Physics
Physics
Physics and Astronomy
Production increases
Rayleigh number
Regular Article
Temperature
Theoretical
Viscosity
Zinc oxide
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Summary:The main objective of this paper is to quantify natural convective heat transfer occurring between two concentric hemispheres differentially heated, through a ZnO-Water nanofluid whose volume fraction varies between 0 (pure water) and 10%. The inner active dome is an electronic device generating a constant heat flux leading to high Rayleigh numbers ranging between 2.31 × 10 7 and 7.21 × 10 10 during operation. The outer cupola is kept isothermal at cold temperature. The base (disk) of the enclosure could be inclined with respect to the horizontal plane by an angle ranging from 0° (horizontal position with dome oriented upwards) to 180° (horizontal position with dome oriented downwards) by steps of 15°. Calculations are realized by means of a 3D numerical approach based on finite volume method. Nusselt–Rayleigh–Prandtl correlations are proposed for two aspect ratios dome-cupola. They are valid for several configurations obtained by varying Rayleigh number, nanofluid volume fraction and tilt angle of the cavity. This new and original correlation allows thermal optimization of the treated assembly for application in various engineering fields as in electronics considered in the present work.
ISSN:2190-5444
2190-5444
DOI:10.1140/epjp/s13360-020-00205-1