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Title:Numerical study of heat-transfer enhancement of homogeneous water-Au nanofluid under natural convection
Authors:ID Ternik, Primož (Author)
ID Rudolf, Rebeka (Author)
ID Žunič, Zoran (Author)
Files:URL http://mit.imt.si/Revija/izvodi/mit123/ternik.pdf
MD5: 230F501D4FC36CAD76B16D413A5D5B1B
Work type:Scientific work
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
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:natural convection, nanofluid, heat transfer, numerical modelling
Publication status:Published
Publication version:Version of Record
Publisher:Inštitut za kovinske materiale in tehnologije
Year of publishing:2012
Number of pages:str. 257-261
Numbering:Letn. 46, št. 3
PID:20.500.12556/DKUM-52159 New window
ISSN on article:1580-2949
COBISS.SI-ID:16061974 New window
Publication date in DKUM:10.07.2015
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Record is a part of a journal

Title:Materiali in tehnologije
Shortened title:Mater. tehnol.
Publisher:Inštitut za kovinske materiale in tehnologije
COBISS.SI-ID:106193664 New window

Document is financed by a project

Funder:ARRS - Slovenian Research Agency
Project number:L2-4212
Name:Tehnologija izdelave Au nano-delcev

Secondary language

Title:Numerična analiza povečanja prenosa toplote homogene nanotekočine voda-Au pod pogoji naravne konvekcije
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.
Keywords:naravna konvekcija, nanotekočine, prenos toplote, numerično modeliranje


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