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Ranga Narayanan
Professor
Ph.D., 1978, Illinois Institute of Technology (1981)
Interfacial instabilities
Transport phenomena with life support, materials science and
biomedical applications
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Brief Description of Current Research
Transport of heat and mass and momentum are often accompanied by spatial and
temporal pattern formation. Understanding the cause of pattern formation is
pivotal as this research has application to the processing of materials on earth
and under microgravity conditions.
In the area of instabilities it is the goal of the present research to
examine the physics of the spontaneous generation of spatial patterns in
processes that involve solidification, electrodeposition and free-surface
convection. The pattern formation is associated with instabilities of a parent
state as a control parameter is changed. Other processes of interest that
involve instabilities are shearing flows with viscous dissipation of heat and
oscillatory flows where flow reversal is the cause of non- rectilinear patterns.
The mathematical methods used in our research are related to bifurcation
theory, nonlinear energy methods and perturbation techniques. The experimental
methods involve flow sensing by infrared imaging, shadow-graphy and
electrochemical titration.
Studies are also being conducted in transport phenomena as applied to
regenerative life support. In this regard the effect of pulsatile flow on mass
and heat transfer is being investigated with the objective of enhancing
transport and separation of species. In addition, these studies have application
to biomedical fields such as transport in the lungs.
Selected Publications
- “The effect of gas dynamics in bilayer liquid-gas convection”,
O. Ozen, E. Theisen, D. Johnson, P.C. Dauby and R. Narayanan, J.
Colloid and Int. Science (to appear, 2005).
- “The instability of an encapsulated cylindrical liquid bridge
subject to off-centering”, K. Uguz and R. Narayanan, Phys Fluids.
Vol. 17, 3, (2005).
- “A comparison of evaporative instability with Marangoni instability", O.
Ozen and R. Narayanan , I and EC Fundamentals Invited 44, 5, 1342
(2005).
- The physics of evaporative and convective instabilities in
bilayer systems: Linear theory”, O. Ozen and R. Narayanan, Phys.
Fluids, Vol. 16, N.12, 4644 (2004).
- “The physics of evaporative instability in bilayer systems: Weak
nonlinear theory, O. Ozen and R. Narayanan Phys. Fluids, Vol
16, N.12, 4653 (2004).
- Interfacial Fluid Mechanics and Transport Processes, co-edited
with D. Schwabe, Springer-Verlag, Heidelberg (2003) .
- Interfacial Instability, co-authored with L. Johns, Springer–Verlag,
N.Y. (2002) .
- Fluid Dynamics at the Interface co-edited with W. Shyy, Cambridge
Univ. Press, (1999) .
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