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  Boiling regimes of impacting drops on a heated substrate under reduced pressure

van Limbeek, M. A. J., Hoefnagels, P. B. J., Shirota, M., Sun, C., & Lohse, D. (2018). Boiling regimes of impacting drops on a heated substrate under reduced pressure. Physical Review Fluids, 3(5): 053601. doi:10.1103/PhysRevFluids.3.053601.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-6BBC-4 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-C6E4-C
Genre: Journal Article

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van Limbeek, M. A. J., Author
Hoefnagels, P. B. J., Author
Shirota, M., Author
Sun, C., Author
Lohse, Detlef1, Author              
Affiliations:
1Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063285              

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 Abstract: We experimentally investigate the boiling behavior of impacting ethanol drops on a heated smooth sapphire substrate at pressures ranging from P = 0.13 bar to atmospheric pressure. We employ frustrated total internal reflection imaging to study the wetting dynamics of the contact between the drop and the substrate. The spreading drop can be in full contact (contact boiling), it can partially touch (transition boiling), or the drop can be fully levitated (Leidenfrost boiling). We show that the temperature of the boundary between contact and transition boiling shows at most a weak dependence on the impact velocity, but a significant decrease with decreasing ambient gas pressure. A striking correspondence is found between the temperature of this boundary and the static Leidenfrost temperature for all pressures. We therefore conclude that both phenomena share the same mechanism and are dominated by the dynamics taking place at the contact line. On the other hand, the boundary between transition boiling and Leidenfrost boiling, i.e., the dynamic Leidenfrost temperature, increases for increasing impact velocity for all ambient gas pressures. Moreover, the dynamic Leidenfrost temperature coincides for pressures between P = 0.13 and 0.54 bar, whereas for atmospheric pressure the dynamic Leidenfrost temperature is slightly elevated. This indicates that the dynamic Leidenfrost temperature is at most weakly dependent on the enhanced evaporation by the lower saturation temperature of the liquid.

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Language(s): eng - English
 Dates: 2018-05-022018-05
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1103/PhysRevFluids.3.053601
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Title: Physical Review Fluids
Source Genre: Journal
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Pages: 10 Volume / Issue: 3 (5) Sequence Number: 053601 Start / End Page: - Identifier: -