M.
Nasir Uddin
Office: CFD Lab, 324 Rendell Hall, MEM Dept.,
E-mail: mnu22@drexel.edu
Tel: 215-895-1909
Education
M.
S. In
progress Drexel University,
Philadelphia, PA, USA
B. S. 2000
Hobbies and personal interests
Cricket,
swimming, long-driving, listening music
Research Project
Title:
Study of Electrically Charged Viscoelastic Jets
Sponsor: US Department of Education/GAANN
Abstract:
A numerical model is developed for gravity and
electrostatically driven viscoelastic liquid meniscus for different polymer
solutions. The model is able to calculate the shape of the liquid cone and the
resulting jet, the velocity fields inside the cone-jet, the electric fields in
and outside the cone-jet, and the surface charge density at the polymer liquid
surface. The model is relevant to the noble process, electrospinning for making
nanofibers. The characterization of viscoelastic polymer solutions will be
carried out using the realistic Giesekus differential viscoelastic model. The effect
of different nozzle diameters and flow rates on the shape of jet will also be considered.
The work includes the calculation of the elelctrostatic field imposed between
the nozzle exit and a collection surface. The electric field will be computed
for both the liquid and surrounding gas zones and the tangential and normal
electric stresses along the gas/liquid interface. The results of the model will
be verified with experimental observations of the cone shape and jet formation.