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Buoyancy and Thermal Acceleration of Supercritical n-Decane in a Rectangular Channel

Li, Yong LU orcid ; Xie, Gongnan LU ; Cao, Zhen LU ; Sundén, Bengt LU and Fu, Jiahong LU (2022) In Journal of Thermophysics and Heat Transfer 36(2). p.419-430
Abstract

In this work, supercritical n-decane flowing in ducts with different orientations is thoroughly investigated in terms of secondary flow, wall shear stress, and thermal acceleration. It is known that the secondary flow strength hardly plays a role in cases of flowing upward, flowing downward, or flowing horizontally at a small heat flux/mass flux. Still, an attachment point can be found at the center for cases of flowing upward and flowing downward, and this enhances the heat transfer. For a large heat flux/mass flux, thermal transport depends not only on the secondary flow strength but also on the secondary flow structure. Besides, a separation point is found at the center for flowing up/downward cases, and the more adjacent the... (More)

In this work, supercritical n-decane flowing in ducts with different orientations is thoroughly investigated in terms of secondary flow, wall shear stress, and thermal acceleration. It is known that the secondary flow strength hardly plays a role in cases of flowing upward, flowing downward, or flowing horizontally at a small heat flux/mass flux. Still, an attachment point can be found at the center for cases of flowing upward and flowing downward, and this enhances the heat transfer. For a large heat flux/mass flux, thermal transport depends not only on the secondary flow strength but also on the secondary flow structure. Besides, a separation point is found at the center for flowing up/downward cases, and the more adjacent the attachment point is to the heated wall, the more serious is the thermal transport. The wall shear stress is beneficial to heat transfer but also relies on the distribution profile. Thermal acceleration can really diminish or even restrain the HTD phenomenon, but it is not the reason to cause the difference of heat transfer behavior for channels with different orientations.

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Please use this url to cite or link to this publication:
author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Thermophysics and Heat Transfer
volume
36
issue
2
pages
419 - 430
publisher
American Institute of Aeronautics and Astronautics
external identifiers
  • scopus:85127788846
ISSN
0887-8722
DOI
10.2514/1.T6408
language
English
LU publication?
yes
id
40bde809-96d6-4117-a6f1-ed4c5bb8f0f8
date added to LUP
2022-06-10 12:03:24
date last changed
2025-02-24 07:44:28
@article{40bde809-96d6-4117-a6f1-ed4c5bb8f0f8,
  abstract     = {{<p>In this work, supercritical n-decane flowing in ducts with different orientations is thoroughly investigated in terms of secondary flow, wall shear stress, and thermal acceleration. It is known that the secondary flow strength hardly plays a role in cases of flowing upward, flowing downward, or flowing horizontally at a small heat flux/mass flux. Still, an attachment point can be found at the center for cases of flowing upward and flowing downward, and this enhances the heat transfer. For a large heat flux/mass flux, thermal transport depends not only on the secondary flow strength but also on the secondary flow structure. Besides, a separation point is found at the center for flowing up/downward cases, and the more adjacent the attachment point is to the heated wall, the more serious is the thermal transport. The wall shear stress is beneficial to heat transfer but also relies on the distribution profile. Thermal acceleration can really diminish or even restrain the HTD phenomenon, but it is not the reason to cause the difference of heat transfer behavior for channels with different orientations.</p>}},
  author       = {{Li, Yong and Xie, Gongnan and Cao, Zhen and Sundén, Bengt and Fu, Jiahong}},
  issn         = {{0887-8722}},
  language     = {{eng}},
  number       = {{2}},
  pages        = {{419--430}},
  publisher    = {{American Institute of Aeronautics and Astronautics}},
  series       = {{Journal of Thermophysics and Heat Transfer}},
  title        = {{Buoyancy and Thermal Acceleration of Supercritical n-Decane in a Rectangular Channel}},
  url          = {{http://dx.doi.org/10.2514/1.T6408}},
  doi          = {{10.2514/1.T6408}},
  volume       = {{36}},
  year         = {{2022}},
}