Surprises abound when considering phase-change phenomena that simultaneously involve gas, liquid, and solid phases. First, we develop scaling laws to capture the arrested hydrodynamics of water droplets impacting icy substrates (Figure 1a). Second, we show that a substrate featuring frost-tipped pillars can trap freezing rain atop the pillars in a low-adhesion state (Figure 1b). Finally, by placing ice cubes on a superheated surface we reveal that the boiling curve gets dramatically stretched out, implying that ice quenching may be superior to spray quenching (Figure 1c).
Figure 1: A trinity of three-phase phenomena. (a) Droplet impact and spreading on ice is affected by freezing. (b) Trapping raindrops on frost tips to promote Cassie ice. (c) Boiling ice on a hot plate.
About the Speaker
Jonathan Boreyko is an Associate Professor and John R. Jones III Fellow at Virginia Tech in the Department of Mechanical Engineering. His research lies at the intersection of fluid mechanics, phase-change heat transfer, and materials science and has been covered by The New York Times, The Washington Post, CNN, and NPR. He has over 60 publications which have been cited over 3,500 times. Recent awards received by Dr. Boreyko include the NSF CAREER Award, the Air Force YIP Award, the ASEE Outstanding New Mechanics Educator Award, and the ASME ICNMM Outstanding Early Career Award. His five children enjoy ice phenomena even more than he does.