- Title
- Weber Number Effect on Molten Droplet Impingement on a Flat Substrate
- Creator
- Chowdhury, Raju; Mitra, Subhasish; Hoque, Mohammad Mainul; Evans, Geoffrey; Honeyands, Tom; Monaghan, Brian; Scimone, David
- Relation
- Chemeca 2020 . Proceedings of the Chemeca 2020 (Online 29 September, 2020 - 22 October, 2020) p. 118-131
- Relation
- https://search.informit.org/doi/10.3316/informit.478625151335835
- Publisher
- Engineers Australia
- Resource Type
- conference paper
- Date
- 2020
- Description
- Impingement of a molten droplet on a solid surface followed by solidification has several applications such as coating of refractory walls by slag splashing in a Basic Oxygen Steelmaking (BOS) furnace. In the present study, this coating formation dynamics was investigated on a flat and smooth soda lime glass substrate. Metal alloys of three different compositions- 99.3wt%Sn-0.7wt%Cu, 96.5wt%Sn-3.0wt%Ag-0.5wt%Cu, and 63wt%Sn-37wt%Pb were used to generate molten droplets. Weber number (We) of the droplets was varied by changing the position of the heating probe with reference to the glass surface which was held fixed. High speed imaging (1000 - 2000 frames/s) in shadowgraphy mode was performed to capture the instantaneous impact dynamics of molten droplets. An in-house image processing code was used to determine the initial droplet diameter (3.54-3.96 mm), impact velocity (u), splat diameter (D) and height (hsplat) in the Weber number range from ~1.45 to 172. It was observed at lower We, a molten droplet upon impact followed a spreading and recoiling phase. Due to non-wetting behaviour of the chosen surface, a recoiling phase was initiated thereafter which resulted in complete rebound of the droplet off the surface. The maximum spread ratio augmented with the increase of Weber number. The maximum spread ratio at solidified state was compared with well-known models. At lower Weber number range, the solidification and oscillation time was found to be much higher, which then diminished with the increasing Weber number. For all values of Weber number, solidification time was found to be much higher than the droplet oscillation time.
- Subject
- drops - measurement; liquid alloys; solidification; temperature - physiological effect; alloys - thermal properties
- Identifier
- http://hdl.handle.net/1959.13/1445942
- Identifier
- uon:42714
- Identifier
- ISBN:9781925627466
- Language
- eng
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