David R. Heine, Ph.D.

Senior Research Scientist, Corning, Inc.

Complex Suspension Rheology using High Performance Computing

Understanding the rheology of complex suspensions is important for manufacturing ceramic substrates and filters which are made by extruding ceramic pastes. These pastes consist of particles that vary in size, shape, and surface properties that are suspended in a mixture of water and organic molecules. The nature of these suspensions makes it difficult to understand the root cause of changes in rheology during processing and the origin of defects in the resulting ceramic parts.

Using Dissipative Particle Dynamics modeling, we study the behavior of complex suspensions under shear. We have tested the impact of particle shape, size, and surface charge on the particle diffusion, ordering, and suspension viscosity by using model systems that are sufficiently idealized to allow us to focus on the impact of each independent variable, which is nearly impossible to do experimentally. In addition, we are studying the wall interaction and impact of die dimensions and wall coating on the suspension behavior. The insights taken from these simulations are improving our understanding of ceramic extrusion and helping to guide the design of experiments to identify causes of defects in our manufacturing process.

Biography

David is a research scientist with Corning working on simulating the flow of ceramic slurries, modeling reactive flow through porous bodies, and studying the interaction of organic and biological materials with solid surfaces. He received a B.S. in Chemical Engineering from the Ohio State University and a Ph. D. from the Colorado School of Mines followed by a postdoctoral appointment at Sandia National Laboratories before joining Corning.

Workshop Program
updated: 2011-10-19