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Air inlet angle influence on the air-side heat transfer and flow friction characteristics of a finned oval tube heat exchanger

Tang, Linghong LU ; Du, Xueping ; Pan, Jie and Sundén, Bengt LU (2019) In International Journal of Heat and Mass Transfer 145.
Abstract

In this study, the influence of various air inlet angles on the heat transfer and flow friction characteristics of a 2-row plain finned oval tube heat exchanger is analyzed by experimental and numerical methods. The experimental results show that an air inlet angle 45° provides the best heat transfer performance, and an air inlet angle 90° provides the smallest pressure drop, while an air inlet angle 30° provides the worst heat transfer performance associated with the largest pressure drop. The 3-D numerical simulation results indicate that with the decrease of the air inlet angle, the uniformity of the air velocity distribution in the z-direction of the heat exchanger becomes worse. The heat transfer characteristics at different air... (More)

In this study, the influence of various air inlet angles on the heat transfer and flow friction characteristics of a 2-row plain finned oval tube heat exchanger is analyzed by experimental and numerical methods. The experimental results show that an air inlet angle 45° provides the best heat transfer performance, and an air inlet angle 90° provides the smallest pressure drop, while an air inlet angle 30° provides the worst heat transfer performance associated with the largest pressure drop. The 3-D numerical simulation results indicate that with the decrease of the air inlet angle, the uniformity of the air velocity distribution in the z-direction of the heat exchanger becomes worse. The heat transfer characteristics at different air inlet angles are analyzed from the prospective of the field synergy principle and the effect of the air velocity distribution uniformity. The overall heat transfer performance is also evaluated by the JF factor under the same air mass flow rate. The results show that the air inlet angle 45° offers the best overall heat transfer performance, next is the air inlet angle 60°, while the air inlet angle 30° has the worst overall heat transfer performance.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Air cooling, Air inlet angle, Finned oval tube heat exchanger, Heat transfer and flow friction characteristics
in
International Journal of Heat and Mass Transfer
volume
145
article number
118702
publisher
Pergamon
external identifiers
  • scopus:85072220296
ISSN
0017-9310
DOI
10.1016/j.ijheatmasstransfer.2019.118702
language
English
LU publication?
yes
id
34894da5-7b25-4bf7-b999-5040eee44f80
date added to LUP
2019-09-27 14:24:34
date last changed
2020-04-07 05:37:31
@article{34894da5-7b25-4bf7-b999-5040eee44f80,
  abstract     = {<p>In this study, the influence of various air inlet angles on the heat transfer and flow friction characteristics of a 2-row plain finned oval tube heat exchanger is analyzed by experimental and numerical methods. The experimental results show that an air inlet angle 45° provides the best heat transfer performance, and an air inlet angle 90° provides the smallest pressure drop, while an air inlet angle 30° provides the worst heat transfer performance associated with the largest pressure drop. The 3-D numerical simulation results indicate that with the decrease of the air inlet angle, the uniformity of the air velocity distribution in the z-direction of the heat exchanger becomes worse. The heat transfer characteristics at different air inlet angles are analyzed from the prospective of the field synergy principle and the effect of the air velocity distribution uniformity. The overall heat transfer performance is also evaluated by the JF factor under the same air mass flow rate. The results show that the air inlet angle 45° offers the best overall heat transfer performance, next is the air inlet angle 60°, while the air inlet angle 30° has the worst overall heat transfer performance.</p>},
  author       = {Tang, Linghong and Du, Xueping and Pan, Jie and Sundén, Bengt},
  issn         = {0017-9310},
  language     = {eng},
  publisher    = {Pergamon},
  series       = {International Journal of Heat and Mass Transfer},
  title        = {Air inlet angle influence on the air-side heat transfer and flow friction characteristics of a finned oval tube heat exchanger},
  url          = {http://dx.doi.org/10.1016/j.ijheatmasstransfer.2019.118702},
  doi          = {10.1016/j.ijheatmasstransfer.2019.118702},
  volume       = {145},
  year         = {2019},
}