Primož Ternik (Author), Rebeka Rudolf (Author)

Abstract

The present work deals with the natural convection in a square cavity filled with the water-based Au nanofluid. The cavity is heated on the vertical and cooled from the adjacent wall, while the other two horizontal walls are adiabatic. The governing differential equations have been solved by the standard finite volume method and the hydrodynamic and thermal fields were coupled together using the Boussinesq approximation. The main objective of this study is to investigate the influence of the nanoparticles' volume fraction on the heat transfer characteristics of Au nanofluids at the given base fluid's (i.e. water) Rayleigh number. Accurate results are presented over a wide range of the base fluid Rayleigh number and the volume fraction of Au nanoparticles. It is shown that adding nanoparticles in a base fluid delays the onset of convection. Contrary to what is argued by many authors, we show by numerical simulations that the use of nanofluids can reduce the heat transfer rate instead of increasing it.

Keywords

natural convection;heat transfer;nanofluid;Nusselt number;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UM FS - Faculty of Mechanical Engineering
UDC: 536
COBISS: 16968470 Link will open in a new window
ISSN: 0354-9836
Views: 805
Downloads: 325
Average score: 0 (0 votes)
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Other data

Secondary language: Slovenian
Secondary keywords: naravna konvekcija;prenos toplote;nanotekočine;Nusseltovo število;
URN: URN:SI:UM:
Type (COBISS): Scientific work
Pages: S189-S200
Volume: ǂVol. ǂ18
Issue: ǂsuppl. ǂ1
Chronology: 2014
DOI: 10.2298/TSCI130604082T
ID: 10847225