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Experimental study on heat transfer of nanofluids in a vertical tube at supercritical pressures

Huang, Dan LU ; Wu, Xiaoyu; Wu, Zan LU ; Li, Wei; Zhu, Haitao and Sundén, Bengt LU (2015) In International Communications in Heat and Mass Transfer 63. p.54-61
Abstract
Regenerative cooling system at supercritical conditions can accommodate high heat fluxes effectively in aerospace applications. The potential of nanofluids as regenerative coolants at supercritical pressures was evaluated in this work. Experiments were carried out to study the heat transfer characteristics of Al2O3-kerosene nanofluids flowing upward in a vertical minitube at supercritical pressures. Parametric effects of mass flow rate, heat flux, pressure and particle content on the heat transfer performance are presented. Results show that increasing the mass flow rate or pressure enhances heat transfer, while higher heat fluxes lead to poorer heat transfer performance. Nanofluids tend to deteriorate heat transfer at supercritical... (More)
Regenerative cooling system at supercritical conditions can accommodate high heat fluxes effectively in aerospace applications. The potential of nanofluids as regenerative coolants at supercritical pressures was evaluated in this work. Experiments were carried out to study the heat transfer characteristics of Al2O3-kerosene nanofluids flowing upward in a vertical minitube at supercritical pressures. Parametric effects of mass flow rate, heat flux, pressure and particle content on the heat transfer performance are presented. Results show that increasing the mass flow rate or pressure enhances heat transfer, while higher heat fluxes lead to poorer heat transfer performance. Nanofluids tend to deteriorate heat transfer at supercritical pressures because deposition of the nanopartides smoothens the wall roughness and presents an additional thermal resistance. As the particle content increases, the heat transfer performance becomes worse. Based on the experimental data, a heat transfer correlation was established for Al2O3-kerosene nanofluids at supercritical pressures and the correlation shows good predictive ability. (C) 2015 Elsevier Ltd. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Minitube, Nanofluid, Parametric effects, Heat transfer, Supercritical pressure
in
International Communications in Heat and Mass Transfer
volume
63
pages
54 - 61
publisher
Elsevier
external identifiers
  • scopus:84939971075
ISSN
0735-1933
DOI
10.1016/j.icheatmasstransfer.2015.02.007
language
English
LU publication?
yes
id
d5aa5713-b344-467b-a7ca-ef7d923b3989 (old id 5424906)
date added to LUP
2015-06-24 12:42:28
date last changed
2017-09-17 03:05:04
@article{d5aa5713-b344-467b-a7ca-ef7d923b3989,
  abstract     = {Regenerative cooling system at supercritical conditions can accommodate high heat fluxes effectively in aerospace applications. The potential of nanofluids as regenerative coolants at supercritical pressures was evaluated in this work. Experiments were carried out to study the heat transfer characteristics of Al2O3-kerosene nanofluids flowing upward in a vertical minitube at supercritical pressures. Parametric effects of mass flow rate, heat flux, pressure and particle content on the heat transfer performance are presented. Results show that increasing the mass flow rate or pressure enhances heat transfer, while higher heat fluxes lead to poorer heat transfer performance. Nanofluids tend to deteriorate heat transfer at supercritical pressures because deposition of the nanopartides smoothens the wall roughness and presents an additional thermal resistance. As the particle content increases, the heat transfer performance becomes worse. Based on the experimental data, a heat transfer correlation was established for Al2O3-kerosene nanofluids at supercritical pressures and the correlation shows good predictive ability. (C) 2015 Elsevier Ltd. All rights reserved.},
  author       = {Huang, Dan and Wu, Xiaoyu and Wu, Zan and Li, Wei and Zhu, Haitao and Sundén, Bengt},
  issn         = {0735-1933},
  keyword      = {Minitube,Nanofluid,Parametric effects,Heat transfer,Supercritical pressure},
  language     = {eng},
  pages        = {54--61},
  publisher    = {Elsevier},
  series       = {International Communications in Heat and Mass Transfer},
  title        = {Experimental study on heat transfer of nanofluids in a vertical tube at supercritical pressures},
  url          = {http://dx.doi.org/10.1016/j.icheatmasstransfer.2015.02.007},
  volume       = {63},
  year         = {2015},
}