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Experimental and numerical study of natural convection in bottom-heated cylindrical cavity filled with molten salt nanofluids

Yu, Qiang ; Lu, Yuanwei ; Zhang, Cancan ; Wu, Yuting and Sunden, Bengt LU (2019) In Journal of Thermal Analysis and Calorimetry
Abstract

This paper combines numerical and experimental to study the heat transfer by free convection for nanofluids of molten salt within a cavity with cylindrical shape which is heated at the bottom and releases heat at the top. The aim is to acquire the free convection laws for nanofluids of molten salt in a cylindrical cavity. It is found that after adding nanoparticles, the molten salts have lower viscosity, higher flow velocity and higher heat transfer rate, and therefore, the free convection heat transfer is enhanced. Meanwhile, nanofluids Nusselt number is larger than that of the molten salts at the same Rayleigh number. In addition, as the classical Garon’s equation cannot provide good predictions of free convection heat transfer for... (More)

This paper combines numerical and experimental to study the heat transfer by free convection for nanofluids of molten salt within a cavity with cylindrical shape which is heated at the bottom and releases heat at the top. The aim is to acquire the free convection laws for nanofluids of molten salt in a cylindrical cavity. It is found that after adding nanoparticles, the molten salts have lower viscosity, higher flow velocity and higher heat transfer rate, and therefore, the free convection heat transfer is enhanced. Meanwhile, nanofluids Nusselt number is larger than that of the molten salts at the same Rayleigh number. In addition, as the classical Garon’s equation cannot provide good predictions of free convection heat transfer for the nanofluids of molten salt, this paper establishes a free convection equation for the nanofluids of molten salt in a cylindrical cavity. This equation is able to predict with an error less than 20% the experimental results. Therefore, the findings can provide a basis for engineering applications of nanofluids and for designing optimal systems of heat stockpile with a single tank.

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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
Cylindrical cavity, Molten salts, Nanofluids, Natural convection
in
Journal of Thermal Analysis and Calorimetry
publisher
Akademiai Kiado
external identifiers
  • scopus:85076892203
ISSN
1388-6150
DOI
10.1007/s10973-019-09112-9
language
English
LU publication?
yes
id
7f485784-20a4-40a5-9661-ad8c06b9309e
date added to LUP
2020-01-09 14:13:37
date last changed
2020-01-10 01:55:33
@article{7f485784-20a4-40a5-9661-ad8c06b9309e,
  abstract     = {<p>This paper combines numerical and experimental to study the heat transfer by free convection for nanofluids of molten salt within a cavity with cylindrical shape which is heated at the bottom and releases heat at the top. The aim is to acquire the free convection laws for nanofluids of molten salt in a cylindrical cavity. It is found that after adding nanoparticles, the molten salts have lower viscosity, higher flow velocity and higher heat transfer rate, and therefore, the free convection heat transfer is enhanced. Meanwhile, nanofluids Nusselt number is larger than that of the molten salts at the same Rayleigh number. In addition, as the classical Garon’s equation cannot provide good predictions of free convection heat transfer for the nanofluids of molten salt, this paper establishes a free convection equation for the nanofluids of molten salt in a cylindrical cavity. This equation is able to predict with an error less than 20% the experimental results. Therefore, the findings can provide a basis for engineering applications of nanofluids and for designing optimal systems of heat stockpile with a single tank.</p>},
  author       = {Yu, Qiang and Lu, Yuanwei and Zhang, Cancan and Wu, Yuting and Sunden, Bengt},
  issn         = {1388-6150},
  language     = {eng},
  month        = {12},
  publisher    = {Akademiai Kiado},
  series       = {Journal of Thermal Analysis and Calorimetry},
  title        = {Experimental and numerical study of natural convection in bottom-heated cylindrical cavity filled with molten salt nanofluids},
  url          = {http://dx.doi.org/10.1007/s10973-019-09112-9},
  doi          = {10.1007/s10973-019-09112-9},
  year         = {2019},
}