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Natural convection enhancement in an eccentric horizontal cylindrical annulus using hybrid nanofluids.
- Source :
-
Numerical Heat Transfer: Part A -- Applications . 2017, Vol. 71 Issue 11, p1159-1173. 15p. 4 Diagrams, 3 Charts, 5 Graphs. - Publication Year :
- 2017
-
Abstract
- The problem of natural convection in an eccentric annulus between two horizontal cylinders filled with Cu–Al2O3/water hybrid nanofluids is investigated numerically in this paper. The inner cylinder wall is heated at a uniform temperature whereas the outer wall is kept isothermally cooled. The basic equations that govern the problem are formulated in the bipolar coordinates and written in terms of the vorticity-stream function equations using the dimensionless form for the bidimensional, laminar, and incompressible flow under steady-state conditions. The dimensionless equations are discretized using the finite-volume method and solved by a FORTRAN program. A numerical parametric study is performed for an annulus filled with regular water, Al2O3/water nanofluid, and Cu–Al2O3/water hybrid nanofluid for various volume fractions of nanoparticles and hybrid nanoparticles (0 ≤ ϕ ≤0.12) and Rayleigh numbers (103 ≤ Ra ≤ 106). It is found that employing a Cu–Al2O3/water hybrid nanofluid provides a better thermal and dynamic performance compared with the similar Al2O3/water nanofluid. [ABSTRACT FROM PUBLISHER]
Details
- Language :
- English
- ISSN :
- 10407782
- Volume :
- 71
- Issue :
- 11
- Database :
- Academic Search Index
- Journal :
- Numerical Heat Transfer: Part A -- Applications
- Publication Type :
- Academic Journal
- Accession number :
- 123828254
- Full Text :
- https://doi.org/10.1080/10407782.2017.1337990