Vortex-Induced Vapor Explosion during Drop Impact on a Superheated Pool
KAUST Grant NumberFCC/1/1975
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AbstractUltra 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.
CitationAlchalabi MA, Kouraytem N, Li EQ, Thoroddsen ST (2017) Vortex-Induced Vapor Explosion during Drop Impact on a Superheated Pool. Experimental Thermal and Fluid Science. Available: http://dx.doi.org/10.1016/j.expthermflusci.2017.04.019.
SponsorsMAA and NK contributed equally to this study. The research reported herein was supported by KAUST research funding. We acknowledge experimental advice from Ivan U. Vakarelski. We thank Tadd T. Truscott for help with the glass container fabrication. NK acknowledges partial support from the Clean Combustion Research Center, under CCF Extreme Combustion FCC/1/1975.
Except where otherwise noted, this item's license is described as © 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/