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EFFECTS OF ELASTIC PILLARS ON FLUID-FLOW AND HEAT TRANSFER ENHANCEMEN IN A MICRO-CHANNEL

Ye, Mingzheng ; Yang, Xian ; Wang, Jin LU ; Vujanovi, Milan and Sunden, Bengt LU (2023) In Thermal Science 27(1). p.275-287
Abstract

In this paper, periodic vortices are generated by a fluid passing a cylindrical obstacle, d, near the micro-channel inlet. Two elastic pillars are arranged on the walls, and the effect of the pillar spacing on heat transfer performance is studied using the Arbitrary Lagrangian-Euler method. With the spacing of 10d, the small pillar amplitude of 2 μm is not conducive to the generation of vortices. The flexible vortex generator has higher heat transfer efficiency and lower pressure loss than the rigid vortex generator. The two pillars with no spacing generate isolated vortices, and the mixing of these vortices is insufficient downstream the pillars. It is found that with the pillar spacing of 5d, the overall performance factor is... (More)

In this paper, periodic vortices are generated by a fluid passing a cylindrical obstacle, d, near the micro-channel inlet. Two elastic pillars are arranged on the walls, and the effect of the pillar spacing on heat transfer performance is studied using the Arbitrary Lagrangian-Euler method. With the spacing of 10d, the small pillar amplitude of 2 μm is not conducive to the generation of vortices. The flexible vortex generator has higher heat transfer efficiency and lower pressure loss than the rigid vortex generator. The two pillars with no spacing generate isolated vortices, and the mixing of these vortices is insufficient downstream the pillars. It is found that with the pillar spacing of 5d, the overall performance factor is significantly higher than that with the pillar spacing of 0d and 10d in the Reynolds number range of 800 to 1100. The average Nusselt number with the spacing of 5d increases by 19.2% compared to that with the spacing of 0d at the Reynolds number of 1000. When the Reynolds number is 1100, the overall performance factor is 43% higher than that with a single rigid pillar. The vortices are periodically generated by the two pillars with the 5d spacing, and the disturbance to the boundary layer enhances the heat transfer downstream the region in the micro-channel.

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author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
dynamic mesh, flexible vortex generator, fluid-structure interaction, heat transfer enhancement, micro-channel
in
Thermal Science
volume
27
issue
1
pages
13 pages
publisher
Vinca Inst Nuclear Sci
external identifiers
  • scopus:85150486040
ISSN
0354-9836
DOI
10.2298/TSCI220617139Y
language
English
LU publication?
yes
id
118b3b7c-2f01-4189-a360-4973a9664bc7
date added to LUP
2023-08-08 14:42:36
date last changed
2023-11-08 08:17:49
@article{118b3b7c-2f01-4189-a360-4973a9664bc7,
  abstract     = {{<p>In this paper, periodic vortices are generated by a fluid passing a cylindrical obstacle, d, near the micro-channel inlet. Two elastic pillars are arranged on the walls, and the effect of the pillar spacing on heat transfer performance is studied using the Arbitrary Lagrangian-Euler method. With the spacing of 10d, the small pillar amplitude of 2 μm is not conducive to the generation of vortices. The flexible vortex generator has higher heat transfer efficiency and lower pressure loss than the rigid vortex generator. The two pillars with no spacing generate isolated vortices, and the mixing of these vortices is insufficient downstream the pillars. It is found that with the pillar spacing of 5d, the overall performance factor is significantly higher than that with the pillar spacing of 0d and 10d in the Reynolds number range of 800 to 1100. The average Nusselt number with the spacing of 5d increases by 19.2% compared to that with the spacing of 0d at the Reynolds number of 1000. When the Reynolds number is 1100, the overall performance factor is 43% higher than that with a single rigid pillar. The vortices are periodically generated by the two pillars with the 5d spacing, and the disturbance to the boundary layer enhances the heat transfer downstream the region in the micro-channel.</p>}},
  author       = {{Ye, Mingzheng and Yang, Xian and Wang, Jin and Vujanovi, Milan and Sunden, Bengt}},
  issn         = {{0354-9836}},
  keywords     = {{dynamic mesh; flexible vortex generator; fluid-structure interaction; heat transfer enhancement; micro-channel}},
  language     = {{eng}},
  number       = {{1}},
  pages        = {{275--287}},
  publisher    = {{Vinca Inst Nuclear Sci}},
  series       = {{Thermal Science}},
  title        = {{EFFECTS OF ELASTIC PILLARS ON FLUID-FLOW AND HEAT TRANSFER ENHANCEMEN IN A MICRO-CHANNEL}},
  url          = {{http://dx.doi.org/10.2298/TSCI220617139Y}},
  doi          = {{10.2298/TSCI220617139Y}},
  volume       = {{27}},
  year         = {{2023}},
}