Virtual Seminar"Explosive boiling of drops near a solid surface and inside a turbulent flow"Chao Sun

Micro/Bio/Nanofluidics (Shen) Unit would like to invite you to the virtual seminar by Prof. Chao Sun on January 12 (Wednesday).
 
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Date: Wednesday, January 12, 2022
Time: 16:00-17:00
**Zoom session
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Join Zoom Meeting
https://oist.zoom.us/j/95676347700?pwd=RjIzZzA4dHNCdUdXejVJUVpJbHh4dz09

Meeting ID: 956 7634 7700
Passcode: 583170

Speaker:

Prof. Chao Sun
Center for Combustion Energy &
Department of Energy and Power Engineering &
Department of Engineering Mechanics
Tsinghua University, Beijing

Title:

Explosive boiling of drops near a solid surface and inside a turbulent flow

Abstract:

In this talk, we will discuss two problems. The first problem is about the evaporation dynamics of Leidenfrost drops. The gasification of multicomponent drops is relevant in various energy-related technologies. An interesting phenomenon associated with this process is the self-induced explosion of the drop, which promotes drop atomization. We study a unique explosive gasification process of a suspension (solid-liquid) droplet and a tri-component (liquid-liquid) droplet in a levitated Leidenfrost state. The second problem is about turbulent flow with boiling drops. Turbulence is known for its ability to vigorously mix fluid and transport heat. We have conceptualized a kind of “active particle” turbulence, which far exceeds the limits of classical thermal turbulence. By adding a minute concentration of a heavy liquid (hydrofluoroether) to a water-based turbulent convection system, a remarkably efficient biphasic dynamics is born. We find that the heat transfer enhancement is dominated by the kinematics of the active elements (bubbles and drops) and their induced-agitation.

Host:

Prof. Amy Shen