Primož Ternik (Author), Rebeka Rudolf (Author), Zoran Žunič (Author)

Abstract

A numerical analysis is performed to examine the heat transfer of colloidal dispersions of Au nanoparticles in water (Au nanofluids). The analysis used a two-dimensional enclosure under natural convection heat-transfer conditions and has been carried out for the Rayleigh number in the range of 103 < Ra < 105, and for the Au nanoparticles' volume-fraction range of 0 < j < 0.10. We report highly accurate numerical results indicating clearly that the mean Nusselt number is an increasing function of both Rayleigh number and volume fraction of Au nanoparticles. The results also indicate that a heat-transfer enhancement is possible using nanofluids in comparison to conventional fluids. However, low Rayleigh numbers show more enhancement compared to high Rayleigh numbers.

Keywords

naravna konvekcija;nanotekočine;prenos toplote;numerično modeliranje;natural convection;nanofluid;heat transfer;numerical modelling;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UM FS - Faculty of Mechanical Engineering
Publisher: Inštitut za kovinske materiale in tehnologije
UDC: 536.2:519.61/.64
COBISS: 16061974 Link will open in a new window
ISSN: 1580-2949
Parent publication: Materiali in tehnologije
Views: 863
Downloads: 98
Average score: 0 (0 votes)
Metadata: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Other data

Secondary language: Slovenian
Secondary title: Numerična analiza povečanja prenosa toplote homogene nanotekočine voda-Au pod pogoji naravne konvekcije
Secondary abstract: V prispevku smo numerično analizirali prenos toplote v koloidnih disperzijah nanodelcev zlata v vodi (Au-nanotekočine). Pri tem smo obravnavali dvodimenzionalno kotanjo pod pogoji naravne konvekcije za vrednosti Rayleighevega števila 103 < Ra < 105 in volumenske koncentracije Au-nanodelcev 0 < j < 0,10. Rezultati analize kažejo, da je srednje Nusseltovo število naraščajoča funkcija obeh, tako Rayleighevega števila kot volumenskega deleža Au-nanodelcev. Prikazani rezultati nakazujejo, da lahko prenos toplote izboljšamo z uporabo Au-nanotekočin namesto navadnih tekočin. Pri tem pa je pozitivni učinek na prenos toplote izrazitejši pri nižjih vrednostih Rayleighevega števila.
Secondary keywords: naravna konvekcija;nanotekočine;prenos toplote;numerično modeliranje;
URN: URN:NBN:SI
Type (COBISS): Scientific work
Pages: str. 257-261
Volume: ǂLetn. ǂ46
Issue: ǂšt. ǂ3
Chronology: maj-jun. 2012
ID: 1726410