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Numerical analysis of supercritical n-decane upward flow and heat transfer characteristics in the buffer layer of a vertical tube

Li, Yong LU ; Sun, Feng ; Xie, Gongnan LU and Sundén, Bengt LU (2020) In Numerical Heat Transfer; Part A: Applications 77(3). p.247-265
Abstract

To explore the behavior and mechanisms of heat transfer deterioration (HTD), the flow and thermal performances of supercritical n-decane in upward vertical tubes are investigated with emphasis on the boundary layer. It is realized that the dramatic variation of the thermophysical properties can cause unconventional heat transfer phenomenon and the change of the density is important in particular. The intensity of the HTD gradually increases once the position of the pseudo-critical temperature lays in the buffer layer region. Correspondingly, the turbulence kinetic energy is significantly suppressed. The large temperature gradient in the buffer layer zone means that the temperature commonly used in existing empirical correlations and... (More)

To explore the behavior and mechanisms of heat transfer deterioration (HTD), the flow and thermal performances of supercritical n-decane in upward vertical tubes are investigated with emphasis on the boundary layer. It is realized that the dramatic variation of the thermophysical properties can cause unconventional heat transfer phenomenon and the change of the density is important in particular. The intensity of the HTD gradually increases once the position of the pseudo-critical temperature lays in the buffer layer region. Correspondingly, the turbulence kinetic energy is significantly suppressed. The large temperature gradient in the buffer layer zone means that the temperature commonly used in existing empirical correlations and based on the wall temperature or bulk temperature is not very appropriate and such an approach leads to poor prediction accuracy of the correlations.

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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Numerical Heat Transfer; Part A: Applications
volume
77
issue
3
pages
9 pages
publisher
Taylor & Francis
external identifiers
  • scopus:85075162294
ISSN
1040-7782
DOI
10.1080/10407782.2019.1688049
language
English
LU publication?
yes
id
a26795c0-42f0-43b0-87e2-05af782f80e4
date added to LUP
2019-12-10 09:39:12
date last changed
2020-10-08 11:11:37
@article{a26795c0-42f0-43b0-87e2-05af782f80e4,
  abstract     = {<p>To explore the behavior and mechanisms of heat transfer deterioration (HTD), the flow and thermal performances of supercritical n-decane in upward vertical tubes are investigated with emphasis on the boundary layer. It is realized that the dramatic variation of the thermophysical properties can cause unconventional heat transfer phenomenon and the change of the density is important in particular. The intensity of the HTD gradually increases once the position of the pseudo-critical temperature lays in the buffer layer region. Correspondingly, the turbulence kinetic energy is significantly suppressed. The large temperature gradient in the buffer layer zone means that the temperature commonly used in existing empirical correlations and based on the wall temperature or bulk temperature is not very appropriate and such an approach leads to poor prediction accuracy of the correlations.</p>},
  author       = {Li, Yong and Sun, Feng and Xie, Gongnan and Sundén, Bengt},
  issn         = {1040-7782},
  language     = {eng},
  number       = {3},
  pages        = {247--265},
  publisher    = {Taylor & Francis},
  series       = {Numerical Heat Transfer; Part A: Applications},
  title        = {Numerical analysis of supercritical n-decane upward flow and heat transfer characteristics in the buffer layer of a vertical tube},
  url          = {http://dx.doi.org/10.1080/10407782.2019.1688049},
  doi          = {10.1080/10407782.2019.1688049},
  volume       = {77},
  year         = {2020},
}