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Entropy generation analysis of fully-developed turbulent heat transfer flow in inward helically corrugated tubes

Wang, Wei LU ; Zhang, Yaning ; Liu, Jian LU ; Wu, Zan LU ; Li, Bingxi and Sundén, Bengt LU (2018) In Numerical Heat Transfer; Part A: Applications 73(11). p.788-805
Abstract

The entropy generation analysis of fully-developed turbulent heat transfer flow in inward helically corrugated tubes was numerically performed by using a Reynolds stress model. The simulations were conducted for a smooth tube and five cases of corrugated tubes with Reynolds number (Re) ranging from 10,020 to 40,060 at a constant wall temperature condition. The effects of corrugation pitch and height on the flow patterns as well as local thermal and frictional entropy generation are detailed in the near wall region. The results indicate that the local heat transfer entropy generation is significantly evident at the sub-layer region and the detached vortex region, and the local thermal entropy is improved with increases in the secondary... (More)

The entropy generation analysis of fully-developed turbulent heat transfer flow in inward helically corrugated tubes was numerically performed by using a Reynolds stress model. The simulations were conducted for a smooth tube and five cases of corrugated tubes with Reynolds number (Re) ranging from 10,020 to 40,060 at a constant wall temperature condition. The effects of corrugation pitch and height on the flow patterns as well as local thermal and frictional entropy generation are detailed in the near wall region. The results indicate that the local heat transfer entropy generation is significantly evident at the sub-layer region and the detached vortex region, and the local thermal entropy is improved with increases in the secondary flow. Local friction entropy generation is mainly located at the windward of the corrugation and the severely turbulent fluctuation region and is mainly induced by the velocity gradient. The average friction entropy generation exhibits an exponential growth, while the average heat transfer and the total entropy generation display a linear growth trend with increased Re. The average Bejan number (Be) exhibits an exponential decline, and the minimum value can reach 0.69. From a comprehensive viewpoint, it is optimal for the Re to be lower than 30,050. When Re <20,030, higher and dense corrugations are beneficial. When 20,030 < Re <30,050, low and spare corrugations are more optimal. Besides, the case with Hl/D = 0.08 is not recommended.

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publication status
published
subject
in
Numerical Heat Transfer; Part A: Applications
volume
73
issue
11
pages
18 pages
publisher
Taylor & Francis
external identifiers
  • scopus:85049333866
ISSN
1040-7782
DOI
10.1080/10407782.2018.1459137
language
English
LU publication?
yes
id
f0017068-d17a-4df6-bc6d-859a041e6d65
date added to LUP
2018-07-16 11:14:09
date last changed
2020-10-07 05:57:39
@article{f0017068-d17a-4df6-bc6d-859a041e6d65,
  abstract     = {<p>The entropy generation analysis of fully-developed turbulent heat transfer flow in inward helically corrugated tubes was numerically performed by using a Reynolds stress model. The simulations were conducted for a smooth tube and five cases of corrugated tubes with Reynolds number (Re) ranging from 10,020 to 40,060 at a constant wall temperature condition. The effects of corrugation pitch and height on the flow patterns as well as local thermal and frictional entropy generation are detailed in the near wall region. The results indicate that the local heat transfer entropy generation is significantly evident at the sub-layer region and the detached vortex region, and the local thermal entropy is improved with increases in the secondary flow. Local friction entropy generation is mainly located at the windward of the corrugation and the severely turbulent fluctuation region and is mainly induced by the velocity gradient. The average friction entropy generation exhibits an exponential growth, while the average heat transfer and the total entropy generation display a linear growth trend with increased Re. The average Bejan number (Be) exhibits an exponential decline, and the minimum value can reach 0.69. From a comprehensive viewpoint, it is optimal for the Re to be lower than 30,050. When Re &lt;20,030, higher and dense corrugations are beneficial. When 20,030 &lt; Re &lt;30,050, low and spare corrugations are more optimal. Besides, the case with Hl/D = 0.08 is not recommended.</p>},
  author       = {Wang, Wei and Zhang, Yaning and Liu, Jian and Wu, Zan and Li, Bingxi and Sundén, Bengt},
  issn         = {1040-7782},
  language     = {eng},
  month        = {06},
  number       = {11},
  pages        = {788--805},
  publisher    = {Taylor & Francis},
  series       = {Numerical Heat Transfer; Part A: Applications},
  title        = {Entropy generation analysis of fully-developed turbulent heat transfer flow in inward helically corrugated tubes},
  url          = {http://dx.doi.org/10.1080/10407782.2018.1459137},
  doi          = {10.1080/10407782.2018.1459137},
  volume       = {73},
  year         = {2018},
}