Provost's Lecture Series
Please join us on 3 May 2013 from noon-2p in the
Student
Center Theatre
to hear Dr. Bjong Wolf Yeighpresent
his
lecture in the Provost's Lecture Series entitled “
Motion of nanoscale contaminant particles in air
bearings
under electrostatic charges”. (Light
refreshments
will be served.)
ABSTRACT: This study examines the
possible effect that electrostatic forces may have on
debris
particle motion through the interface between two
sliding
surfaces in an air bearing. It uses, as an example, the
read/write head and disk surface of a typical modern
hard disk
drive. The Reynolds equation for compressible
fluids at
high bearing numbers is solved using a factored implicit
scheme.
A first-order molecular slip correction is also applied.
Debris
particle motion equations are derived with corrections
for
gravity, drag, and the Saffman lift effect from
previous studies and combined with an equation for
electrostatic
forces proposed in this study. Aluminum debris
particles
ranging from 150 to 300nm are introduced and tracked by
solving
motion equations using Runge-Kutta methods.
Electrostatic forces acting on a debris particle were
found to
affect trajectories at levels of charge far lower than
anticipated. Charges at levels as low as 1.5
electrons
influenced particle motion significantly.
ABOUT THE SPEAKER - In addition to his current position as President (and Professor) of SUNYIT, which he has held since 2008, Dr.Yeigh served as VP for Academic Affairs and Dean of the faculty at Norwich University in Vermont. He also has held several other academic and administrative posts at ST. Louis and Yale Universities, and he was a member of the faculty at Oklahoma State University.
He received his education and training from Dartmouth College, Stanford University and Princeton University, where he received his Ph.D. in Civil Engineering.
Dr. Yeigh is widely published in the field of engineering and also wrote a companion textbook entitled Mechanics of Materials Companion: Case Studies, Design, and Retrofit , intended for use with texts on strength of materials.
Currently, Dr. Yeigh plays a major role in securing a future for SUNYIT in support of nanotechnology in the Mohawk Valley.