Table of Contents
Transient Interfacial Phenomena in Miscible Polymer Systems (TIPMPS)
What is the question to be answered?
Why?
How
Impact
Science Objectives
Surface-Tension-Induced Convection
Consider a Miscible “Interface”
Can the analogous process occur with miscible fluids?
Korteweg (1901)
Korteweg Stress
Hypothesis: Effective Interfacial Tension
Theory of Cahn and Hilliard
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Why is this important?
How?
Photopolymerization can be used to rapidly prepare polymer/monomer interfaces
Schematic
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Variable gradient
Why Microgravity?
Simulations
Model of Korteweg Stresses in Miscible Fluids
Essential Problem: Estimation of Square Gradient Parameter “k”
Spinning Drop Technique
Image of drop
Evidence for Existence of EIT
Estimation of k from SDT
Balsara & Nauman: Polymer-Solvent Systems
Simulations
We validated the model by comparing to “true interface model”
Variation in d
Simulation of Time-Dependent Flow
Concentration-Dependent Viscosity: m = m0elc
Variable transition zone, d, 0.2 to 5 mm
streamlines
Maximum Displacement Dependence on k
Dependence on variation in d
Effect of Temperature Gradient
viscosity 10X monomer (0.01 Pa s)
side heating, d = 0.9 mm
side heating, d = 0.9 mm, m(c) =0 .01 Pa s * e5 c
effect of temperature-dependent D
significant flow
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Effect of Conversion Gradient
9.4
with D(T)
Limitations of Model
Conclusions
Quo Vademus?
Acknowledgments
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Author: John Pojman
Email: john@pojman.com
Home Page: www.pojman.com
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