Comparative evaluations of thermofluidic characteristics of sandwich panels with X-lattice and Pyramidal-lattice cores
(2018) In International Journal of Heat and Mass Transfer 127. p.268-282- Abstract
This study compares the thermo-fluidic characteristics of sandwich panels with the X-lattice and the Pyramidal lattice at a given porosity and surface area density. The numerical model is validated against available experimental data at first. At a given Reynolds number in the range of 3100–5700, numerical results reveal that the X-lattice sandwich panel provides a 47–60% higher average overall Nusselt number. The special topology of the X-lattice induces counter-rotating spiral primary flow and more complex secondary flows, including one which becomes a longitudinal vortex later. The flow in the Pyramidal lattice sandwich panel is composed of a parallel primary flow and a counter-rotating vortex pair entrenched in the zone behind... (More)
This study compares the thermo-fluidic characteristics of sandwich panels with the X-lattice and the Pyramidal lattice at a given porosity and surface area density. The numerical model is validated against available experimental data at first. At a given Reynolds number in the range of 3100–5700, numerical results reveal that the X-lattice sandwich panel provides a 47–60% higher average overall Nusselt number. The special topology of the X-lattice induces counter-rotating spiral primary flow and more complex secondary flows, including one which becomes a longitudinal vortex later. The flow in the Pyramidal lattice sandwich panel is composed of a parallel primary flow and a counter-rotating vortex pair entrenched in the zone behind ligaments of the Pyramidal lattice. Compared with the Pyramidal lattice sandwich panel, endwall heat transfer of the X-lattice sandwich panel is enhanced by 75–97% and the ligaments surface heat transfer is enhanced by 85–97% at a given Reynolds number. It is also found that the friction factor of the X-lattice sandwich panel is about 2 times higher for the spiral primary flow and more complex secondary flows induced by the staggered ligaments. Finally, at a given pumping power, the cooling performance of the X-lattice is much better, too. Taking the identical fabrication method and cost into account, apparently the X-lattice is superior in engineering applications.
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- author
- Jin, Xin ; Shen, Beibei ; Yan, Hongbin ; Sunden, Bengt LU and Xie, Gongnan LU
- organization
- publishing date
- 2018-12-01
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Counter-rotating vortex, Enhanced heat transfer, Longitudinal vortex, Pyramidal-lattice, Sandwich panel, Spiral primary flow, X-lattice
- in
- International Journal of Heat and Mass Transfer
- volume
- 127
- pages
- 15 pages
- publisher
- Pergamon Press Ltd.
- external identifiers
-
- scopus:85050519883
- ISSN
- 0017-9310
- DOI
- 10.1016/j.ijheatmasstransfer.2018.07.087
- language
- English
- LU publication?
- yes
- id
- 75aad995-3393-4d3a-b4a0-8a60690dd813
- date added to LUP
- 2018-08-14 14:31:46
- date last changed
- 2022-03-17 08:46:10
@article{75aad995-3393-4d3a-b4a0-8a60690dd813,
abstract = {{<p>This study compares the thermo-fluidic characteristics of sandwich panels with the X-lattice and the Pyramidal lattice at a given porosity and surface area density. The numerical model is validated against available experimental data at first. At a given Reynolds number in the range of 3100–5700, numerical results reveal that the X-lattice sandwich panel provides a 47–60% higher average overall Nusselt number. The special topology of the X-lattice induces counter-rotating spiral primary flow and more complex secondary flows, including one which becomes a longitudinal vortex later. The flow in the Pyramidal lattice sandwich panel is composed of a parallel primary flow and a counter-rotating vortex pair entrenched in the zone behind ligaments of the Pyramidal lattice. Compared with the Pyramidal lattice sandwich panel, endwall heat transfer of the X-lattice sandwich panel is enhanced by 75–97% and the ligaments surface heat transfer is enhanced by 85–97% at a given Reynolds number. It is also found that the friction factor of the X-lattice sandwich panel is about 2 times higher for the spiral primary flow and more complex secondary flows induced by the staggered ligaments. Finally, at a given pumping power, the cooling performance of the X-lattice is much better, too. Taking the identical fabrication method and cost into account, apparently the X-lattice is superior in engineering applications.</p>}},
author = {{Jin, Xin and Shen, Beibei and Yan, Hongbin and Sunden, Bengt and Xie, Gongnan}},
issn = {{0017-9310}},
keywords = {{Counter-rotating vortex; Enhanced heat transfer; Longitudinal vortex; Pyramidal-lattice; Sandwich panel; Spiral primary flow; X-lattice}},
language = {{eng}},
month = {{12}},
pages = {{268--282}},
publisher = {{Pergamon Press Ltd.}},
series = {{International Journal of Heat and Mass Transfer}},
title = {{Comparative evaluations of thermofluidic characteristics of sandwich panels with X-lattice and Pyramidal-lattice cores}},
url = {{http://dx.doi.org/10.1016/j.ijheatmasstransfer.2018.07.087}},
doi = {{10.1016/j.ijheatmasstransfer.2018.07.087}},
volume = {{127}},
year = {{2018}},
}