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Heat transfer and flow structure in a detached latticework duct

Du, Wei LU ; Luo, Lei ; Wang, Songtao ; Liu, Jian LU and Sunden, Bengt LU (2019) In Applied Thermal Engineering 155. p.24-39
Abstract

A numerical method was used to study the effect of clearance and rotational number on the thermal performance in a detached latticework duct. The latticework duct, which had four-entry sub-channels, was located in a simplified rectangular channel. The crossing angle for each sub-channel was 45°. The numerical studies were conducted with various clearances (0–0.5) and various rotational numbers (0–0.5). The streamlines, wall shear stress and Nusselt number were analyzed. The results indicated that the detached latticework provided a small mechanical energy loss with considerable heat transfer enhancement. In the traditional latticework duct, the impingement, turn and helical flows dominated the flow structure. The impingement and helical... (More)

A numerical method was used to study the effect of clearance and rotational number on the thermal performance in a detached latticework duct. The latticework duct, which had four-entry sub-channels, was located in a simplified rectangular channel. The crossing angle for each sub-channel was 45°. The numerical studies were conducted with various clearances (0–0.5) and various rotational numbers (0–0.5). The streamlines, wall shear stress and Nusselt number were analyzed. The results indicated that the detached latticework provided a small mechanical energy loss with considerable heat transfer enhancement. In the traditional latticework duct, the impingement, turn and helical flows dominated the flow structure. The impingement and helical flows brought high Nusselt numbers and high wall shear stress in the latticework duct. In the detached latticework, the leakage flow, which is induced by the clearance, also changed the flow structure and heat transfer significantly. As the clearance was increased, the leakage became strong while the impingement and helical flows became weak. In the rotational condition, the Coriolis force promoted the heat transfer on the suction side but weakened the heat transfer on the pressure side. In addition, the wall shear stress on the suction side and leakage flow were increased under high rotational number.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Clearance, Detached latticework, Helical flow, Impingement, Leakage flow
in
Applied Thermal Engineering
volume
155
pages
16 pages
publisher
Elsevier
external identifiers
  • scopus:85063612645
ISSN
1359-4311
DOI
10.1016/j.applthermaleng.2019.03.148
language
English
LU publication?
yes
id
168bce6d-7cef-4aa5-b598-9b61ff70664d
date added to LUP
2019-04-09 08:50:22
date last changed
2020-04-02 02:25:55
@article{168bce6d-7cef-4aa5-b598-9b61ff70664d,
  abstract     = {<p>A numerical method was used to study the effect of clearance and rotational number on the thermal performance in a detached latticework duct. The latticework duct, which had four-entry sub-channels, was located in a simplified rectangular channel. The crossing angle for each sub-channel was 45°. The numerical studies were conducted with various clearances (0–0.5) and various rotational numbers (0–0.5). The streamlines, wall shear stress and Nusselt number were analyzed. The results indicated that the detached latticework provided a small mechanical energy loss with considerable heat transfer enhancement. In the traditional latticework duct, the impingement, turn and helical flows dominated the flow structure. The impingement and helical flows brought high Nusselt numbers and high wall shear stress in the latticework duct. In the detached latticework, the leakage flow, which is induced by the clearance, also changed the flow structure and heat transfer significantly. As the clearance was increased, the leakage became strong while the impingement and helical flows became weak. In the rotational condition, the Coriolis force promoted the heat transfer on the suction side but weakened the heat transfer on the pressure side. In addition, the wall shear stress on the suction side and leakage flow were increased under high rotational number.</p>},
  author       = {Du, Wei and Luo, Lei and Wang, Songtao and Liu, Jian and Sunden, Bengt},
  issn         = {1359-4311},
  language     = {eng},
  pages        = {24--39},
  publisher    = {Elsevier},
  series       = {Applied Thermal Engineering},
  title        = {Heat transfer and flow structure in a detached latticework duct},
  url          = {http://dx.doi.org/10.1016/j.applthermaleng.2019.03.148},
  doi          = {10.1016/j.applthermaleng.2019.03.148},
  volume       = {155},
  year         = {2019},
}