Abstract
A combined experimental and computational investigation of micrometric diesel droplets impacting on a heated aluminium substrate is presented. Dual view high-speed imaging has been employed to visualize the evolution of the impact process at various conditions. The parameters investigated include wall-surface temperature ranging from 140 to 400°C, impact Weber and Reynolds numbers of 19-490 and 141-827, respectively, and ambient pressure of 1 and 2 bar. Six possible post-impact regimes were identified, termed as Stick, Splash, Partial-Rebound, Rebound, Breakup-Rebound and Breakup-Stick, and plotted on the We-T map. Additionally, the temporal variation of the apparent dynamic contact angle and spreading factor have been determined as a function of the impact Weber number and surface temperature. Numerical simulations have also been performed using a two-phase flow model with interface capturing, phase-change and variable physical properties. Increased surface temperature resulted to increased maximum spreading diameter and induced quicker and stronger recoiling behaviour, mostly attributed to the change of liquid viscosity.
| Original language | English |
|---|---|
| Article number | 20170759 |
| Number of pages | 20 |
| Journal | Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences |
| Volume | 474 |
| Issue number | 2215 |
| DOIs | |
| Publication status | Published - 4 Jul 2018 |
| Externally published | Yes |
Funding
Dataaccessibility. Thedatasetssupportingthisarticlehavebeenuploadedaspartoftheelectronicsupplementary material. Authors’ contributions. H.J. conducted the experimental investigation as part of his PhD. I.M. performed the numerical simulations, as part of his PhD. M.G. is the project PI and first supervisor of the two PhD students; N.M. is the co-investigator and second supervisor. I.K. is the post-doctoral researcher who assisted in the analysis of the experimental data. All the authors gave their final approval for publication. Competing interests. We declare we have no competing interests. Funding. The research was financially supported partially by The Lloyd’s Register Foundation and City, University of London supporting the studentship of H.J. Acknowledgements. The authors acknowledge the contribution of The Lloyd’s Register Foundation. Lloyd’s Register Foundation helps to protect life and property by supporting engineering-related education, public engagement and the application of research.
Keywords
- Computational fluid dynamics
- Diesel
- Droplet
- Hot surface
- Impingement
- Leidenfrost
ASJC Scopus subject areas
- General Mathematics
- General Engineering
- General Physics and Astronomy
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