Laminar natural convection of non-Newtonian power-law fluid in an eccentric annulus
This work is about studying the natural convection of two-dimensional steady state non-Newtonian power law fluid numerically. The inner cylinder was put eccentrically into the outer one. The cylinders are held at constant temperatures with the inner one heated isothermally at temperature Th...
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2021-01-01
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doaj-ce62f7eee08a426ab34edaa9940ea0fa2021-02-05T08:41:54ZengVINCA Institute of Nuclear SciencesThermal Science0354-98362334-71632021-01-01251 Part A29330510.2298/TSCI190805424B0354-98361900424BLaminar natural convection of non-Newtonian power-law fluid in an eccentric annulusBenhizia Oussama0Bouzit Mohamed1Dellil Ahmed Zineddine2Department of ELM, Institute of Maintenance and Industrial Safety, University of Oran 2 Mohamed ben Ahmed, Oran, AlgeriaUniversity Centre Belhadj Bouchaib, Ain Temouchent, AlgeriaDepartment of ELM, Institute of Maintenance and Industrial Safety, University of Oran 2 Mohamed ben Ahmed, Oran, AlgeriaThis work is about studying the natural convection of two-dimensional steady state non-Newtonian power law fluid numerically. The inner cylinder was put eccentrically into the outer one. The cylinders are held at constant temperatures with the inner one heated isothermally at temperature Th and the outer one cooled isothermally at temperature Tc (Th>Tc). The simulations have been taken for the parameters 103≤Ra≤105, 10≤Pr≤103, 0.6≤n≤1.4, 0≤ɛ≤0.9 and an inclination angle ϕ from 0° up to 90°. The average Nusselt numbers for the previous parameters are obtained and discussed numerically. The results revealed that the average Nusselt number has the highest values when n=0.6, Ra=105 at ϕ=0 which is a signal for the large transfer herein and has the lowest values for n=1.4, Ra=103 at ϕ=90° which is a signal that the transfer is by conduction more than convection. Furthermore, the increasing of eccentricity causes an increase in the Nusselt number for all the cases. Finally, the best case where we can get the best heat transfer is at ϕ = 0, ɛ=0.9 among them all. The results have compared with some precedent works and showed good agreement.http://www.doiserbia.nb.rs/img/doi/0354-9836/2021/0354-98361900424B.pdfnatural convectioneccentric annulusansys cfxnon-newtonian fluidpower law modelnusselt number |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Benhizia Oussama Bouzit Mohamed Dellil Ahmed Zineddine |
spellingShingle |
Benhizia Oussama Bouzit Mohamed Dellil Ahmed Zineddine Laminar natural convection of non-Newtonian power-law fluid in an eccentric annulus Thermal Science natural convection eccentric annulus ansys cfx non-newtonian fluid power law model nusselt number |
author_facet |
Benhizia Oussama Bouzit Mohamed Dellil Ahmed Zineddine |
author_sort |
Benhizia Oussama |
title |
Laminar natural convection of non-Newtonian power-law fluid in an eccentric annulus |
title_short |
Laminar natural convection of non-Newtonian power-law fluid in an eccentric annulus |
title_full |
Laminar natural convection of non-Newtonian power-law fluid in an eccentric annulus |
title_fullStr |
Laminar natural convection of non-Newtonian power-law fluid in an eccentric annulus |
title_full_unstemmed |
Laminar natural convection of non-Newtonian power-law fluid in an eccentric annulus |
title_sort |
laminar natural convection of non-newtonian power-law fluid in an eccentric annulus |
publisher |
VINCA Institute of Nuclear Sciences |
series |
Thermal Science |
issn |
0354-9836 2334-7163 |
publishDate |
2021-01-01 |
description |
This work is about studying the natural convection of two-dimensional steady
state non-Newtonian power law fluid numerically. The inner cylinder was put
eccentrically into the outer one. The cylinders are held at constant
temperatures with the inner one heated isothermally at temperature Th and
the outer one cooled isothermally at temperature Tc (Th>Tc). The simulations
have been taken for the parameters 103≤Ra≤105, 10≤Pr≤103, 0.6≤n≤1.4, 0≤ɛ≤0.9
and an inclination angle ϕ from 0° up to 90°. The average Nusselt numbers
for the previous parameters are obtained and discussed numerically. The
results revealed that the average Nusselt number has the highest values when
n=0.6, Ra=105 at ϕ=0 which is a signal for the large transfer herein and has
the lowest values for n=1.4, Ra=103 at ϕ=90° which is a signal that the
transfer is by conduction more than convection. Furthermore, the increasing
of eccentricity causes an increase in the Nusselt number for all the cases.
Finally, the best case where we can get the best heat transfer is at ϕ = 0,
ɛ=0.9 among them all. The results have compared with some precedent works
and showed good agreement. |
topic |
natural convection eccentric annulus ansys cfx non-newtonian fluid power law model nusselt number |
url |
http://www.doiserbia.nb.rs/img/doi/0354-9836/2021/0354-98361900424B.pdf |
work_keys_str_mv |
AT benhiziaoussama laminarnaturalconvectionofnonnewtonianpowerlawfluidinaneccentricannulus AT bouzitmohamed laminarnaturalconvectionofnonnewtonianpowerlawfluidinaneccentricannulus AT dellilahmedzineddine laminarnaturalconvectionofnonnewtonianpowerlawfluidinaneccentricannulus |
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1724283798076522496 |