Vortex-Induced Vapor Explosion during Drop Impact on a Superheated Pool

Mohamad Alchalabi, Nadia Kouraytem, Erqiang Li, Sigurdur T Thoroddsen

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Ultra high-speed imaging is used to investigate the vapor explosion when a drop impacts onto a high-temperature pool. The two liquids are immiscible, a low boiling-temperature perfluorohexane drop, at room temperature, which impacts a high boiling-temperature soybean-oil pool, which is heated well above the boiling temperature of the drop. We observe different regimes: weak and strong nucleate boiling, film boiling or Leidenfrost regime and entrainment followed by vapor explosion. The vapor explosions were seen to depend on the formation of a rotational flow at the edge of the impact crater, near the pool surface, which resembles a vortex ring. This rotational motion entrains a thin sheet of the drop liquid, to become surrounded by the oil. In that region, the vapor explosion starts at a point after which it propagates azimuthally along the entire periphery at high speed.
Original languageEnglish (US)
Pages (from-to)60-68
Number of pages9
JournalExperimental Thermal and Fluid Science
Volume87
DOIs
StatePublished - Apr 18 2017

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