University of Minnesota
Aerospace Engineering and Mechanics
Fall 2001 Seminar Series



Minor Losses in Oscillating Flow


Dr. Barton Smith

Los Alamos National Lab


Abstract


Energy dissipation that is manifest by gradients in pressure in a flow system is often expressed in terms of a pressure loss factor. While there is a wealth of data on loss factors for a myriad of geometries in steady flow, few such data exist for pulsatile or oscillatory flow. Recent advances in thermoacoustics motivate work in this area. An oscillatory flow system has been constructed to investigate loss factors in 2-D geometries. The current results provide loss factors of entrances/sudden expansions. It is found that the losses are primarily a function of the displacement amplitude. The results also provide information on the variation of the "equivalent length" with the same parameter, and on turbulent disipation for this geometry. Oscillating flow in diffusers is also investigated, with emphasis on loss factors as a function of diffuser angle, and unsteady separation effects.

Friday, October 12, 2001
209 Akerman Hall
2:30-3:30 p.m.


Refreshments served after the seminar in 227 Akerman Hall.
Disability accomodations provided upon request.
Contact Kristal Belisle, Senior Secretary, 625-8000.