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Mass transfer effects of drops in a liquid flow

Event Type: 
Date and Time: 
Friday, March 3, 2017 - 16:30
Location: 
CTR Conference Room 103
Event Sponsor: 
Parviz Moin, Director of Center for Turbulence Research
Speaker(s): 
Shigan Chu, Johns Hopkins University, Department of Mechanical Engineering

Even a nominally immiscible drop will grow or dissolve in an ambient liquid due to diffusion. The mass flux at the drop surface is dictated by the drop composition. For a pure drop, this composition is essentially constant in time.  The situation is very different for a multicomponent drop in which, due to the mutual interaction of the constituents, their concentrations at the drop surface differ from the respective solubilities and depends on time. The result is a memory term for the mass flux through the interface, which does not exist for a drop of a pure liquid.   

In this talk, Shigan Chu will first determine the time-dependent surface concentrations by assuming thermodynamic equilibrium at the drop surface, and their influence on the drop mass transfer in ternary systems.   Then the relevance of the new memory term will be evaluated under several situations. The theory of multicomponent drop dissolution will further be applied to multiphase plumes where dispersed phase such as drops and bubbles dissolve into the liquid as they rise. 

Bio: 
Shigan Chu is currently a Ph.D. candidate in Mechanical Engineering Department of the Johns Hopkins University. He received M.S. in Mechanical Engineering from the Johns Hopkins University and B.S. in Mechanics & Engineering Science from Peking University. His graduate research focuses on mass transfer in multiphase flow and drops/bubbles laden turbulent buoyant plumes.