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Mitigation of Heat Transfer Deterioration of Supercritical CO2 Vertical Tube Upward Flows by Introducing Truncated-Ribs in Helical-Like Distribution

Hangfei, Duan ; Gongnan, Xie ; Yuan, Ma ; Shulei, Li and Bengt, Sunden LU (2023) In ASME Journal of Heat and Mass Transfer 145(5).
Abstract

To effectively alleviate the heat transfer deterioration (HTD) phenomenon of supercritical CO2 flow in a vertical circular tube, this paper proposes multiple truncated ribs from a whole O-ring rib but distributed in helical-like distribution. The fluid hydraulics and thermal performance with a verified standard k–x mode are numerically explored. The effects of the height, the distance, and the number of truncated ribs on flow characteristics, and heat transfer are observed and analyzed in detail. Results show that the heat transfer coefficient increases significantly with increasing rib height, and as the pitch decreases the fluid recirculation area behind each rib decreases, resulting in stronger mixing of swirling flow,... (More)

To effectively alleviate the heat transfer deterioration (HTD) phenomenon of supercritical CO2 flow in a vertical circular tube, this paper proposes multiple truncated ribs from a whole O-ring rib but distributed in helical-like distribution. The fluid hydraulics and thermal performance with a verified standard k–x mode are numerically explored. The effects of the height, the distance, and the number of truncated ribs on flow characteristics, and heat transfer are observed and analyzed in detail. Results show that the heat transfer coefficient increases significantly with increasing rib height, and as the pitch decreases the fluid recirculation area behind each rib decreases, resulting in stronger mixing of swirling flow, which enhances turbulent kinetic energy in the downstream and weakens the buoyancy force, thus mitigating heat transfer deterioration. This study suggests that introducing multiple truncated ribs distributed along helices into circular vertical tubes can be a beneficial way to alleviate heat transfer deterioration and to enhance heat transfer of supercritical CO2 flow.

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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
heat transfer deterioration, supercritical CO, turbulence, vertical tubes multiple rib
in
ASME Journal of Heat and Mass Transfer
volume
145
issue
5
article number
051901-1
publisher
American Society Of Mechanical Engineers (ASME)
external identifiers
  • scopus:85170419211
ISSN
2832-8450
DOI
10.1115/1.4055858
language
English
LU publication?
yes
id
87f5c06d-d54a-448d-a8f3-e8bfd389935b
date added to LUP
2024-01-12 15:37:19
date last changed
2024-01-27 14:37:16
@article{87f5c06d-d54a-448d-a8f3-e8bfd389935b,
  abstract     = {{<p>To effectively alleviate the heat transfer deterioration (HTD) phenomenon of supercritical CO<sub>2</sub> flow in a vertical circular tube, this paper proposes multiple truncated ribs from a whole O-ring rib but distributed in helical-like distribution. The fluid hydraulics and thermal performance with a verified standard k–x mode are numerically explored. The effects of the height, the distance, and the number of truncated ribs on flow characteristics, and heat transfer are observed and analyzed in detail. Results show that the heat transfer coefficient increases significantly with increasing rib height, and as the pitch decreases the fluid recirculation area behind each rib decreases, resulting in stronger mixing of swirling flow, which enhances turbulent kinetic energy in the downstream and weakens the buoyancy force, thus mitigating heat transfer deterioration. This study suggests that introducing multiple truncated ribs distributed along helices into circular vertical tubes can be a beneficial way to alleviate heat transfer deterioration and to enhance heat transfer of supercritical CO<sub>2</sub> flow.</p>}},
  author       = {{Hangfei, Duan and Gongnan, Xie and Yuan, Ma and Shulei, Li and Bengt, Sunden}},
  issn         = {{2832-8450}},
  keywords     = {{heat transfer deterioration; supercritical CO; turbulence; vertical tubes multiple rib}},
  language     = {{eng}},
  number       = {{5}},
  publisher    = {{American Society Of Mechanical Engineers (ASME)}},
  series       = {{ASME Journal of Heat and Mass Transfer}},
  title        = {{Mitigation of Heat Transfer Deterioration of Supercritical CO<sub>2</sub> Vertical Tube Upward Flows by Introducing Truncated-Ribs in Helical-Like Distribution}},
  url          = {{http://dx.doi.org/10.1115/1.4055858}},
  doi          = {{10.1115/1.4055858}},
  volume       = {{145}},
  year         = {{2023}},
}