Search
Abstract
A theoretical analysis of the influence of temperature and nanoparticle concentration on free convection heat transfer from a horizontal tube immersed in an unbounded nanofluid was presented. The Nusselt (Nu) number and heat transfer coefficient were parameters of the intensity of the convective heat transfer. For free convection, the Nu number was a function of the Rayleigh (Ra) number and Prandtl (Pr) number. The Rayleigh (Ra) number and Prandtl (Pr) number were functions of the thermophysical properties of nanofluids. The thermophysical properties of nanofluids varied with temperature and nanoparticle concentration. Therefore, an analysis was conducted to evaluate the effects on the performance of nanofluids due to variations of thermal conductivity, viscosity, thermal expansion, density, and specific heat, which are functions of nanoparticle concentration and temperature. Water- and ethylene glycol (EG)-based nanofluids with dispersed alumina (Al2O3) nanoparticles at mass concentrations of 0.01%, 0.1%, and 1% were considered. Calculated Nu numbers and heat transfer coefficients were compared with experimental values taken from the published literature.
Citations
-
5
CrossRef
-
0
Web of Science
-
5
Scopus
Authors (3)
-
Sławomir Smoleń
-
Dorota Sawicka mgr
Cite as
Full text
- Publication version
- Accepted or Published Version
- License
-
open in new tab
Keywords
Details
- Category:
- Articles
- Type:
- artykuły w czasopismach
- Published in:
-
ENERGIES
no. 14,
ISSN: 1996-1073 - Language:
- English
- Publication year:
- 2021
- Bibliographic description:
- Cieśliński J., Smoleń S., Sawicka D.: Effect of Temperature and Nanoparticle Concentration on Free Convective Heat Transfer of Nanofluids// ENERGIES -, (2021), s.1-19
- DOI:
- Digital Object Identifier (open in new tab) 10.3390/en14123566
- Verified by:
- Gdańsk University of Technology
seen 128 times
Recommended for you
Experimental Investigation of Free Convection Heat Transfer from Horizontal Cylinder to Nanofluids
- D. Sawicka,
- J. Cieśliński,
- S. Smolen
Numerical simulation of natural convection of Glycol-Al2O3 nanofluids from a horizontal cylinder
- D. Sawicka,
- A. Baars,
- J. Cieśliński
- + 1 authors