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Investigation of mixed convection in an enclosure filled with nanofluids of Al2O3 –water and graphene-ethylene glycol

Wang, Jin LU ; Li, Guolong; Luo, Jing; Wu, Zan LU and Sundén, Bengt LU (2019) In Journal of Nanofluids 8(2). p.337-348
Abstract

In this research work, heat transfer enhancement of mixed convection in an enclosure is investigated with a moving top wall. Numerical simulations based on an Al2 O3 –water nanofluid are conducted by using variable thermophysical properties. Flow fields and temperature distributions are analyzed by considering effects of two partially heated walls. Moreover, water–ethylene glycol mixed with graphene nanoplatelets (GnP-WEG) is also considered to analyze effects of the heating procedure, Reynolds number, Rayleigh number and volume fraction of the nanoparticles, as well as on the heat transfer enhancement. It is found that there is a velocity difference between the pure water and the Al2 O3... (More)

In this research work, heat transfer enhancement of mixed convection in an enclosure is investigated with a moving top wall. Numerical simulations based on an Al2 O3 –water nanofluid are conducted by using variable thermophysical properties. Flow fields and temperature distributions are analyzed by considering effects of two partially heated walls. Moreover, water–ethylene glycol mixed with graphene nanoplatelets (GnP-WEG) is also considered to analyze effects of the heating procedure, Reynolds number, Rayleigh number and volume fraction of the nanoparticles, as well as on the heat transfer enhancement. It is found that there is a velocity difference between the pure water and the Al2 O3 –water nanofluid due to the increase of the fluid viscosity by an injection of Al2 O3 nanoparticles into the water. Moreover, flow patterns are significantly affected by the Reynolds number and the Rayleigh number. The heat transfer in the enclosure is enhanced by the increase of the top wall moving velocity. Although heat transfer enhancement for most cases are obtained by increasing the volume fraction of graphene nanoplatelets, a mixture of 0.25% graphene nanoplatelets and the water–ethylene glycol (the base fluid) provides the largest enhancement of heat transfer at low Reynolds number (Re = 1).

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Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Ethylene glycol, Graphene, Nanofluid, Natural convection, Thermophysical property
in
Journal of Nanofluids
volume
8
issue
2
pages
12 pages
publisher
American Scientific Publishers
external identifiers
  • scopus:85056628560
ISSN
2169-432X
DOI
10.1166/jon.2019.1595
language
English
LU publication?
yes
id
4d0ccc3b-ac30-4c2a-ba48-ac3f93d5b765
date added to LUP
2018-11-26 11:00:41
date last changed
2019-02-20 11:37:46
@article{4d0ccc3b-ac30-4c2a-ba48-ac3f93d5b765,
  abstract     = {<p>In this research work, heat transfer enhancement of mixed convection in an enclosure is investigated with a moving top wall. Numerical simulations based on an Al<sub>2</sub> O<sub>3</sub> –water nanofluid are conducted by using variable thermophysical properties. Flow fields and temperature distributions are analyzed by considering effects of two partially heated walls. Moreover, water–ethylene glycol mixed with graphene nanoplatelets (GnP-WEG) is also considered to analyze effects of the heating procedure, Reynolds number, Rayleigh number and volume fraction of the nanoparticles, as well as on the heat transfer enhancement. It is found that there is a velocity difference between the pure water and the Al<sub>2</sub> O<sub>3</sub> –water nanofluid due to the increase of the fluid viscosity by an injection of Al<sub>2</sub> O<sub>3</sub> nanoparticles into the water. Moreover, flow patterns are significantly affected by the Reynolds number and the Rayleigh number. The heat transfer in the enclosure is enhanced by the increase of the top wall moving velocity. Although heat transfer enhancement for most cases are obtained by increasing the volume fraction of graphene nanoplatelets, a mixture of 0.25% graphene nanoplatelets and the water–ethylene glycol (the base fluid) provides the largest enhancement of heat transfer at low Reynolds number (Re = 1).</p>},
  author       = {Wang, Jin and Li, Guolong and Luo, Jing and Wu, Zan and Sundén, Bengt},
  issn         = {2169-432X},
  keyword      = {Ethylene glycol,Graphene,Nanofluid,Natural convection,Thermophysical property},
  language     = {eng},
  number       = {2},
  pages        = {337--348},
  publisher    = {American Scientific Publishers},
  series       = {Journal of Nanofluids},
  title        = {Investigation of mixed convection in an enclosure filled with nanofluids of Al<sub>2</sub>O<sub>3</sub> –water and graphene-ethylene glycol},
  url          = {http://dx.doi.org/10.1166/jon.2019.1595},
  volume       = {8},
  year         = {2019},
}