Levich Institute Seminar Announcement, 12/01/2009
Tuesday, 12/01/2009
2:00 PM
Steinman Hall, Room #312
(Chemical Engineering Conference Room)

Dr. Larry Schwartz
Schlumberger-Doll Research

"A New way to Look at Diffusion (and Relaxation) in Mixed Porosity Systems"


ABSTRACT


Many porous media exhibit a wide range of pore sizes. One often sees macro-pores that are 2050 microns in diameter and micro-pores whose size can be roughly 100 times smaller. Spatially, the macro and micro-pores can be arranged either in series, in parallel or a combination of the two. In such systems, the simulation of transport properties and diffusion presents a serious computational challenge. Using a combination of fixed step size and first passage random walk techniques, we calculate electrical transport, the time development of the effective diffusion coefficient, D(t), and surface-induced proton spin relaxation. In treating magnetic resonance, the enhanced interfacial relaxation determines the degree of coupling between the two pore populations. Our calculations employ models based on grain packing and on images obtained by micro-CT imaging of real systems.

BRIEF ACADEMIC/EMPLOYMENT BACKGROUND:


  • 1970-72 Post-doc, Harvard University
  • 1972-82 Physics Department, Brandeis University
  • 1982-09 Schlumberger Research
  • 2007-09 Visiting Scientist, Earth Sciences, MIT

CURRENT RESEARCH INTERESTS:


The physics of porous media (reservoir evaluation in the language of the oil industry). With colleagues at MIT, Boston University and Schlumberger, my recent research focuses on diffusion and transport in systems where the pore space has a wide range of length scales