Heat transfer correlations for jet impingement boiling over micro-pin-finned surface
(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.
(Less)
- author
- Zhang, Yonghai ; Liu, Bin ; Wei, Jinjia ; Sundén, Bengt LU and Wu, Zan LU
- organization
- publishing date
- 2018-11-01
- 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
- Elsevier
- 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
- 2025-04-04 14:29:52
@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}},
keywords = {{Correlations; FC-72; Heat transfer enhancement; Jet impingement; Micro-pin-fins}},
language = {{eng}},
month = {{11}},
pages = {{401--413}},
publisher = {{Elsevier}},
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}},
doi = {{10.1016/j.ijheatmasstransfer.2018.04.167}},
volume = {{126}},
year = {{2018}},
}