Affiliation:
1. Department of Aerospace and Mechanical Engineering, University of Notre Dame, Notre Dame, IN 46556
Abstract
A numerical study of flow in a novel viscous-based pumping device appropriate for microscale applications is described. The device, essentially consisting of a rotating cylinder eccentrically placed in a channel, is shown to be capable of generating a net flow against an externally imposed pressure gradient. Navier-Stokes Simulations at low Reynolds numbers are carried out using a finite-volume approach to study the influence of various geometric parameters. Slip effects for gas flows are also briefly investigated. The numerical results indicate that the generated flow rate is a maximum when the cylinder is in contact with a channel wall and that an optimum plate spacing exists. These observations are in excellent agreement, both qualitatively and quantitatively, with a previous experimental study. Furthermore, it is shown that effective pumping is obtained even for considerably higher Reynolds numbers, thereby extending the performance envelope of the proposed device to non-microscale applications as well. Finally, slip-flow effects appear to be significant only for Knudsen numbers greater than 0.1, which is important from the point of view of microscale applications.
Reference23 articles.
1. Angell
J. B.
, TerryS. C., and BarthP. W., 1983, “Silicon Micromechanical Devices,” Scientific American, Vol. 248, Apr., pp. 44–55.
2. Badr
H. M.
, DennisS. C. R., and YoungP. J. S., 1989, “Steady and Unsteady Flow Past a Rotating Cylinder at Low Reynolds Numbers,” Computers and Fluids, Vol. 17, pp. 579–609.
3. Beskok
A.
, and KarniadakisG. E., 1994, “Simulation of Heat and Momentum Transfer in Complex Micro-Geometries,” AIAA Journal of Thermophysics and Heat Transfer, Vol. 8, No. 4, pp. 355–370.
4. Chen, H. C., and Patel, V. C., 1989, “The Flow Around Wing-Body Junctions,” Proceedings of the Fourth Symposium on Numerical and Physical Aspects of Aerodynamic Flows, T. Cebeci, ed., Long Beach, CA, 16–19 Jan.
5. Gabriel
K. J.
, 1995, “Engineering Microscopic Machines,” Scientific American, Vol. 273, Sept., pp. 150–153.
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