University of Minnesota
Aerospace Engineering and Mechanics
Spring 2002 Seminar Series



Two-phase PIV and its application to the suspension and interaction of heavy particles with a horizontal turbulent channel flow


Prof. Ken Kiger

Department of Mechanical Engineering, University of Maryland


Abstract

Particle/wall turbulence interaction is an important topic to many natural and industrial processes such as particle deposition in materials processing, pneumatic transport of granular materials, and sediment transport within rivers and marine flows. Although much work has been done on this topic, there are still many aspects of particle/turbulence interaction within the wall bounded region that is only known qualitatively, or under limited conditions due to restrictions by existing technology or theoretical simplifications. One such important topic is the coupling mechanism that is responsible for the suspension and sedimentation of relatively large, heavy particulates within horizontal, wall-bounded shear flow. Since the development of the contemporary understanding of turbulent burst and sweep structures within boundary layers, it has been speculated that this mechanism is primarily responsible for the suspension and interaction of the particles within the flow. While this work has revolutionized our phenomenological understanding of the flow, continued model development has not matched this progress in multiphase systems due to a lack of quantitative measures of these processes. In light of the above discussion, the current work has focused on trying to resolve some of these issues by utilizing a unique image separation technique to make simultaneous PIV measurements of both the particulate and carrier phase. These measurements allow for the quantification of the important particle/fluid interaction statistics, as well as providing representative instantaneous vector fields of the carrier fluid structure responsible for the interaction. This talk will present an overview of the PIV method and its validation, along with a presentation and interpretation of our current results concerning the particle interaction within the flow.

Friday, March 1, 2002
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.