Explosive behavior during binary-droplet impact on superheated substrates
| Autor: | Constantine M. Megaridis, Ranjan Ganguly, Tamal Roy, W. Andreas Schroeder, Uddalok Sen, Louis A. Angeloni |
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| Rok vydání: | 2020 |
| Předmět: |
Fluid Flow and Transfer Processes
Materials science Explosive material Mechanical Engineering 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics Breakup 01 natural sciences Instability Leidenfrost effect 010305 fluids & plasmas Superheating Volume (thermodynamics) Chemical physics Boiling 0103 physical sciences 0210 nano-technology Nucleate boiling |
| Zdroj: | International Journal of Heat and Mass Transfer. 154:119658 |
| ISSN: | 0017-9310 |
| DOI: | 10.1016/j.ijheatmasstransfer.2020.119658 |
| Popis: | Droplet impact on superheated smooth solids has attracted enormous attention since Leidenfrost reported the eponymous phenomenon over 250 years ago. The related literature has almost exclusively focused on pure liquids, which maintain their volume integrity even under disruptive nucleate boiling (characterized by the vigorous ejection of tiny droplets from the parent droplet). This study provides evidence of the existence of a new regime – termed explosive boiling – for impact of binary (composed of two miscible liquids) droplets on superheated substrates at temperatures between the respective Leidenfrost temperatures of the two liquid constituents. The distinct characteristic of this regime is a violent breakup of the parent droplet, and is observed only for the lower concentrations of the more volatile component of the mixture. These concentrations seem to maximize the instability of the vapor layer between the droplet and the wall. We explore this previously-unseen behavior, considering the different volatilities of the two liquid constituents and their relative volume ratios in the impacting droplet. |
| Databáze: | OpenAIRE |
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