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Heat transfer correlations for jet impingement boiling over micro-pin-finned surface

Zhang, Yonghai; Liu, Bin; Wei, Jinjia; Sundén, Bengt LU and Wu, Zan LU (2018) In International Journal of Heat and Mass Transfer 126. p.401-413
Abstract

Heat transfer performance of submerged jet impingement boiling over staggered micro-pin-finned surfaces was investigated using air-dissolved FC-72. The dimension of the silicon chips is 10 × 10 × 0.5 mm3 (length × width × thickness) on staggered micro-pin-fins with four dimensions of 30 × 30 × 60 μm3, 50 × 50 × 60 μm3, 30 × 30 × 120 μm3 and 50 × 50 × 120 μm3 (width × thickness × height, named S-PF30-60, S-PF50-60, S-PF30-120, and S-PF50-120) were fabricated by using the dry etching technique. The effects of micro-pin-fins, jet-to-target distance (H = 3, 6, and 9 mm), and jet Reynolds number (Re = 2853, 5707, and 8560) on jet impingement boiling heat transfer performance were... (More)

Heat transfer performance of submerged jet impingement boiling over staggered micro-pin-finned surfaces was investigated using air-dissolved FC-72. The dimension of the silicon chips is 10 × 10 × 0.5 mm3 (length × width × thickness) on staggered micro-pin-fins with four dimensions of 30 × 30 × 60 μm3, 50 × 50 × 60 μm3, 30 × 30 × 120 μm3 and 50 × 50 × 120 μm3 (width × thickness × height, named S-PF30-60, S-PF50-60, S-PF30-120, and S-PF50-120) were fabricated by using the dry etching technique. The effects of micro-pin-fins, jet-to-target distance (H = 3, 6, and 9 mm), and jet Reynolds number (Re = 2853, 5707, and 8560) on jet impingement boiling heat transfer performance were explored. For comparison, experiments with jet impinging on a smooth surface were also conducted. The results showed that all micro-pin-finned surfaces show better heat transfer performance than that of a smooth surface. The largest Nusselt number is 1367, corresponding to a heat transfer coefficient of 26387 W·m−2·K−1 with S-PF30-120 at Re = 8560, H/d = 2, and q = 151 W·cm−2, which is approximately twice the largest Nusselt number of Chip S. In the single-phase heat-transfer-dominant region, the Nusselt number (Nu) is mainly influenced by several dimensionless numbers, including Reynolds number (Re), boiling number (Bo), the ratio of jet-to-target distance to jet diameter (H/d), the ratio of micro-pin-finned surface area to smooth surface area A/AS, and a dimensionless number corresponding to flow resistance Dh/Lh. Correlations to predict Nu in both single-phase heat-transfer-dominant region and two-phase heat-transfer-dominant region for smooth and micro-pin-finned surfaces were proposed. The results show that most data (96%) in the single-phase heat-transfer-dominant region and most data (96%) in the two-phase heat-transfer-dominant region were predicted within ±13% and ±15%, respectively. In addition, CHF correlations for smooth and micro-pin-finned surfaces were also proposed, and most data (95%) are predicted within ±20% for a smooth surface and all the data within ±5% for the micro-pin-finned surfaces.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Correlations, FC-72, Heat transfer enhancement, Jet impingement, Micro-pin-fins
in
International Journal of Heat and Mass Transfer
volume
126
pages
13 pages
publisher
Pergamon
external identifiers
  • scopus:85047228486
ISSN
0017-9310
DOI
10.1016/j.ijheatmasstransfer.2018.04.167
language
English
LU publication?
yes
id
fdd78410-13a3-4539-a53b-1d0483caedd8
date added to LUP
2018-05-31 13:26:11
date last changed
2019-02-20 11:18:39
@article{fdd78410-13a3-4539-a53b-1d0483caedd8,
  abstract     = {<p>Heat transfer performance of submerged jet impingement boiling over staggered micro-pin-finned surfaces was investigated using air-dissolved FC-72. The dimension of the silicon chips is 10 × 10 × 0.5 mm<sup>3</sup> (length × width × thickness) on staggered micro-pin-fins with four dimensions of 30 × 30 × 60 μm<sup>3</sup>, 50 × 50 × 60 μm<sup>3</sup>, 30 × 30 × 120 μm<sup>3</sup> and 50 × 50 × 120 μm<sup>3</sup> (width × thickness × height, named S-PF30-60, S-PF50-60, S-PF30-120, and S-PF50-120) were fabricated by using the dry etching technique. The effects of micro-pin-fins, jet-to-target distance (H = 3, 6, and 9 mm), and jet Reynolds number (Re = 2853, 5707, and 8560) on jet impingement boiling heat transfer performance were explored. For comparison, experiments with jet impinging on a smooth surface were also conducted. The results showed that all micro-pin-finned surfaces show better heat transfer performance than that of a smooth surface. The largest Nusselt number is 1367, corresponding to a heat transfer coefficient of 26387 W·m<sup>−2</sup>·K<sup>−1</sup> with S-PF30-120 at Re = 8560, H/d = 2, and q = 151 W·cm<sup>−2</sup>, which is approximately twice the largest Nusselt number of Chip S. In the single-phase heat-transfer-dominant region, the Nusselt number (Nu) is mainly influenced by several dimensionless numbers, including Reynolds number (Re), boiling number (Bo), the ratio of jet-to-target distance to jet diameter (H/d), the ratio of micro-pin-finned surface area to smooth surface area A/A<sub>S</sub>, and a dimensionless number corresponding to flow resistance D<sub>h</sub>/L<sub>h</sub>. Correlations to predict Nu in both single-phase heat-transfer-dominant region and two-phase heat-transfer-dominant region for smooth and micro-pin-finned surfaces were proposed. The results show that most data (96%) in the single-phase heat-transfer-dominant region and most data (96%) in the two-phase heat-transfer-dominant region were predicted within ±13% and ±15%, respectively. In addition, CHF correlations for smooth and micro-pin-finned surfaces were also proposed, and most data (95%) are predicted within ±20% for a smooth surface and all the data within ±5% for the micro-pin-finned surfaces.</p>},
  author       = {Zhang, Yonghai and Liu, Bin and Wei, Jinjia and Sundén, Bengt and Wu, Zan},
  issn         = {0017-9310},
  keyword      = {Correlations,FC-72,Heat transfer enhancement,Jet impingement,Micro-pin-fins},
  language     = {eng},
  month        = {11},
  pages        = {401--413},
  publisher    = {Pergamon},
  series       = {International Journal of Heat and Mass Transfer},
  title        = {Heat transfer correlations for jet impingement boiling over micro-pin-finned surface},
  url          = {http://dx.doi.org/10.1016/j.ijheatmasstransfer.2018.04.167},
  volume       = {126},
  year         = {2018},
}