70th Annual Meeting of the APS Division of Fluid Dynamics (November 19, 2017 — November 21, 2017)

V0075: Vortex-Induced Vapor Explosion During Drop Impact on a Superheated Pool

Authors

• Nadia Kouraytem, University of Utah
• Mohamad AlChalabi, Saudi Aramco
• Erqiang Li, University of Science and Technology of China Hefei
• Sigurdur Thoroddsen, King Abdullah University of Science and Technology

DOI: https://doi.org/10.1103/APS.DFD.2017.GFM.V0075

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.

Read more about the topic:

Alchalabi MA, Kouraytem N, Li EQ, Thoroddsen ST (2017) Vortex-Induced Vapor Explosion during Drop Impact on a Superheated Pool. Experimental Thermal and Fluid Science.