| | SLO | ENG | Cookies and privacy

Bigger font | Smaller font

Show document Help

Title:Numerical study of Rayleigh-Bénard natural-convection heat-transfer characteristics of water-based Au nanofluids
Authors:ID Ternik, Primož (Author)
ID Rudolf, Rebeka (Author)
ID Žunič, Zoran (Author)
Files:.pdf Materiali_in_Tehnologije_2013_Ternik,_Rudolf,_Zunic_NUMERICAL_STUDY_OF_RAYLEIGH-BENARD_NATURAL-CONVECTION_HEAT-TRANSFER_CHARACTERISTICS.pdf (282,00 KB)
MD5: 25EB6B22A2CE50CAE18F44DE55431EC1
 
URL http://mit.imt.si/Revija/izvodi/mit132/ternik.htm
 
Language:English
Work type:Scientific work
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Abstract:The present work deals with the natural convection in a square cavity filled with a water-based Au nanofluid. The cavity is heated from the lower and cooled from the adjacent wall, while the other two walls are adiabatic. Theg overning differential equations have been solved with the standard finite volume method and the hydrodynamic and thermal fields have been coupled using the Boussinesq approximation. The main objective of this study is to investigate the influence of the nanoparticlesć volume fraction on the heat-transfer characteristics of Au nanofluids at a given base-fluid (i.e., water) Rayleigh number Rabf. Accurate results are presented over a wide range of the base-fluid Rayleigh numbers (102 £ Rabf £ 105) and the volume fraction of Au nanoparticles (0 % £ j £ 10 %). It is shown that adding nanoparticles to the base fluid delays the onset of convection. Contrary to what is argued by many authors, we show, with numerical simulations, that the use of nanofluids can reduce the heat transfer instead of increasing it.
Keywords:Rayleigh-Bénard natural convection, water-Au nanofluid, heat transfer, numerical modelling
Publication status in journal:Published
Article version:Publisher's version of article
Year of publishing:2013
Number of pages:str. 211-215
Numbering:Letn. 47, št. 2
PID:20.500.12556/DKUM-50361 New window
ISSN:1580-2949
UDC:519.61/.64:620.3:536.2
ISSN on article:1580-2949
COBISS.SI-ID:16819990 New window
NUK URN:URN:SI:UM:DK:C7KBNG8X
Publication date in DKUM:10.07.2015
Views:1075
Downloads:113
Metadata:XML RDF-CHPDL DC-XML DC-RDF
Categories:Misc.
:
Copy citation
  
Average score:(0 votes)
Your score:Voting is allowed only for logged in users.
Share:Bookmark and Share

Hover the mouse pointer over a document title to show the abstract or click on the title to get all document metadata.

Record is a part of a journal

Title:Materiali in tehnologije
Shortened title:Mater. tehnol.
Publisher:Inštitut za kovinske materiale in tehnologije
ISSN:1580-2949
COBISS.SI-ID:106193664 New window

Document is financed by a project

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
Project number:L2-4212
Name:Tehnologija izdelave Au nano-delcev

Secondary language

Language:Slovenian
Title:Numerična analiza prenosa toplote nanotekočin voda-Au v razmerah Reyleigh-Bénardove naravne konvekcije
Abstract:V prispeveku obravnavamo naravno konvekcijo v kvadratni kotanji, napolnjeni z nanotekočino voda-Au. Kotanja je bila greta s spodnje in hlajena s priležne zgornje stene, preostali dve steni sta bili adiabatni. Vodilne diferencialne enačbe smo reševali s standardno metodo končnih prostornin. Hidrodinamično in temperaturno polje sta bila sklopljena z uporabo Boussinesqove aproksimacije. Glavni cilj prispevka je raziskati vpliv prostorninskega deleža nanodelcev na značilnosti prenosa toplote Au-nanotekočine pri podani vrednosti Rayleighjevega števila nosilne tekočine (vode) Rabf. Natančni rezultati so predstavljeni za široko območje vrednosti Rayleighjevega števila nosilne tekočine (102 £ Rabf £ 105) in prostorninskega deleža Au-nanodelcev (0 % £ j £10 %). Pokazali smo, da dodajanje nanodelcev v nosilno tekočino zakasni začetek naravne konvekcije. V nasprotju s trditvami mnogih avtorjev smo z numeričnimi simulacijami pokazali, da lahko uporaba nanodelcev prenos toplote zmanjša in ne poveča.
Keywords:Rayleigh-Bénardova naravna konvekcija, nanotekočina voda-Au, prenos toplote, numerično modeliranje


Comments

Leave comment

You must log in to leave a comment.

Comments (0)
0 - 0 / 0
 
There are no comments!

Back
Logos of partners University of Maribor University of Ljubljana University of Primorska University of Nova Gorica