Abstract
Droplet train impingement is a fundamental approach to mimic the
complicated interactions between the fluid and the substrate in advanced
thermal engineering applications in industry. Differently from previous
studies, the main original contribution of this study is to perform an
inclined droplet train impingement on a non-uniformly heated surface.
Ethanol was used as the liquid for droplet train impingement
applications, while glass substrate was selected as the target surface.
The inclined flow angle was 63 degrees. Both optical and thermographic
observations were performed on the target surface by focusing on the
droplet impact area. Three experimental sets were created with the Weber
numbers 667.57, 841.90, and 998.01. A surface temperature range was
selected between 85.00 °C and 200.00 °C, which was above the boiling
point of the ethanol. The maximum spreading length was measured at 0.97
mm at the surface temperature of 82.00 °C for the experiment with the
Weber number of 998.01, whilst the minimum spreading length was found at
0.18 mm at the highest surface temperature for the experiment with the
Weber number of 667.57. A uniform splashing direction was observed above
170.00 °C for all experiments, which meant that the sign of the
transition regime appeared.
Original language | English |
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Article number | 229 |
Journal | Fluids |
Volume | 7 |
Issue number | 7 |
Pages (from-to) | 14 |
DOIs | |
Publication status | Published - 2022 |
Keywords
- Boiling
- Droplet evaporation
- Two-phase heat transfer
- Droplet spreading
- Thermal imaging
- Hydrodynamic patterns