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Effects of pitch and corrugation depth on heat transfer characteristics in six-start spirally corrugated tube

Jin, Zhi jiang; Chen, Fu qiang; Gao, Zhi xin; Gao, Xiao fei and Qian, Jin yuan LU (2017) In International Journal of Heat and Mass Transfer 108. p.1011-1025
Abstract

Spirally corrugated tube is one of the most important parts of coaxial heat exchangers. It can greatly improve the heat transfer efficiency of heat exchangers. Here, a novel spirally corrugated tube with six-start is proposed. However, up to now, there is little literature about the heat transfer performance and flow field of this novel six-start spirally corrugated tube. In this paper, the effects of geometric parameters (pitch p, corrugation depth e), Reynolds number Re and fluid properties on the heat transfer performances are investigated based on the validated numerical model. The results show that with the increasing of pitch p, both the heat transfer coefficient h and Nusselt number Nu decrease gradually. Meanwhile, with the... (More)

Spirally corrugated tube is one of the most important parts of coaxial heat exchangers. It can greatly improve the heat transfer efficiency of heat exchangers. Here, a novel spirally corrugated tube with six-start is proposed. However, up to now, there is little literature about the heat transfer performance and flow field of this novel six-start spirally corrugated tube. In this paper, the effects of geometric parameters (pitch p, corrugation depth e), Reynolds number Re and fluid properties on the heat transfer performances are investigated based on the validated numerical model. The results show that with the increasing of pitch p, both the heat transfer coefficient h and Nusselt number Nu decrease gradually. Meanwhile, with the increasing of corrugation depth e, both the secondary flow velocity vxy and the vorticity of longitudinal vortex increase gradually. Moreover, under the same working condition, the heat transfer performances of the six-start spirally corrugated tube are affected by both the working medium and Reynolds number. Finally, a criterion correlation for heat transfer calculation in the six-start spirally corrugated tube is proposed and validated to be reliable and suitable. This work can reveal the enhanced heat transfer mechanism of the six-start spirally corrugated tube and benefit the further research on heat transfer characteristics of multi-start spirally corrugated tube or other related devices.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Computational Fluid Dynamics (CFD), Corrugation depth, Heat transfer, Pitch, Reynolds number, Six-start spirally corrugated tube
in
International Journal of Heat and Mass Transfer
volume
108
pages
15 pages
publisher
Pergamon
external identifiers
  • scopus:85008388749
  • wos:000399357800086
ISSN
0017-9310
DOI
10.1016/j.ijheatmasstransfer.2016.12.091
language
English
LU publication?
yes
id
47c5336e-9e6b-4bfc-8d02-dfd9e0988363
date added to LUP
2017-01-21 14:44:18
date last changed
2018-04-08 04:52:59
@article{47c5336e-9e6b-4bfc-8d02-dfd9e0988363,
  abstract     = {<p>Spirally corrugated tube is one of the most important parts of coaxial heat exchangers. It can greatly improve the heat transfer efficiency of heat exchangers. Here, a novel spirally corrugated tube with six-start is proposed. However, up to now, there is little literature about the heat transfer performance and flow field of this novel six-start spirally corrugated tube. In this paper, the effects of geometric parameters (pitch p, corrugation depth e), Reynolds number Re and fluid properties on the heat transfer performances are investigated based on the validated numerical model. The results show that with the increasing of pitch p, both the heat transfer coefficient h and Nusselt number Nu decrease gradually. Meanwhile, with the increasing of corrugation depth e, both the secondary flow velocity v<sub>xy</sub> and the vorticity of longitudinal vortex increase gradually. Moreover, under the same working condition, the heat transfer performances of the six-start spirally corrugated tube are affected by both the working medium and Reynolds number. Finally, a criterion correlation for heat transfer calculation in the six-start spirally corrugated tube is proposed and validated to be reliable and suitable. This work can reveal the enhanced heat transfer mechanism of the six-start spirally corrugated tube and benefit the further research on heat transfer characteristics of multi-start spirally corrugated tube or other related devices.</p>},
  author       = {Jin, Zhi jiang and Chen, Fu qiang and Gao, Zhi xin and Gao, Xiao fei and Qian, Jin yuan},
  issn         = {0017-9310},
  keyword      = {Computational Fluid Dynamics (CFD),Corrugation depth,Heat transfer,Pitch,Reynolds number,Six-start spirally corrugated tube},
  language     = {eng},
  month        = {05},
  pages        = {1011--1025},
  publisher    = {Pergamon},
  series       = {International Journal of Heat and Mass Transfer},
  title        = {Effects of pitch and corrugation depth on heat transfer characteristics in six-start spirally corrugated tube},
  url          = {http://dx.doi.org/10.1016/j.ijheatmasstransfer.2016.12.091},
  volume       = {108},
  year         = {2017},
}