Research Abstracts Online
January - December 2011
University of Minnesota Twin Cities
College of Science and Engineering
of Mechanical Engineering
PI: Christopher J. Hogan
Mass and Momentum Transfer in the Transition Regime
These researchers are continuing to perform Brownian dynamics (BD) and direct simulation Monte Carlo (DSMC) calculations to examine mass and momentum transfer in the transition regime (where there are Knudsen number dependencies), for non-spherical aerosol particles. They also are continuing to investigate the influence of particle microstructure on the thermal properties of particle-laden suspensions and composites, including the thermal conductivity, dielectric, constant, and electrical conductivity. Specifically, over the past year, this group has developed a functional BD code, which they are using to investigate the following phenomena: vapor molecule-particle collisions and reaction in the gas phase for arbitrarily shaped particles; particle-particle collision rates in the gas-phase for arbitrarily shaped nanoparticles; particle-ion collision rates in the gas-phase; particle-particle collision rates in the presence of Coulombic, van der Waals, and shielded Coulomb potentials; and the collision of ions with arbitrarily shaped aerosol nanoparticles.
In addition to BD calculations for transition regime aerosol particles, the researchers have also developed and are implementing BD techniques (based on the work of Torquato and coworkers and McCammon and coworkers) to determine: the drag force on non-spherical particles in colloidal suspension; the thermal conductivity/electrical conductivity/ dielectric constant of composites composed of agglomerates particles in a host medium; and the intrinsic viscosity/heat and momentum transfer characteristics of suspensions of agglomerated particles.
Finally, the researchers are planning to begin the development of a DSMC approach to the determination of the drag and diffusion coefficient of non-spherical, transition regime aerosol particles.
Suhrid A. Deshmukh, Undergraduate Student
Ranganathan Gopalakrishnan, Graduate Student
Kenneth Hum, Undergraduate Student
Carlos Larriba, Research Associate
Daniel E. Mascarenhas, Graduate Student
Rebecca S. Michels, Undergraduate Student
Derek R. Oberreit, Graduate Student
Hio Ouyang, Graduate Student
Vinay Premnath, Graduate Student
Thaseem Thajudeen, Graduate Student