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Presenter: Dr. Hui Hu - Department of Mechanical Engineering, Michigan State University
Supervisor:

Date: Fri, March 7, 2003
Time: 11:00:00 - 00:00:00
Place: EOW 430

ABSTRACT

Abstract

The talk will start with description of the technical aspects and system set-up of an advanced Particle Image Velocimetry (PIV) technique, named as Dual-plane Stereoscopic PIV, developed by the speaker. Unlike "classical" PIV systems or conventional stereoscopic PIV systems, which can only get distributions of one-component of vorticity vectors, the dual-plane stereoscopic PIV system can provide all three components of velocity and vorticity distributions in fluid flows distributions with various auto-correlation and cross-correlation coefficients of flow variables instantaneously and simultaneously. The dual-plane stereoscopic PIV system is applied to conduct measurements in an air jet flow exhausted from a lobed nozzle to demonstrate its feasibility. The evolution and interaction characteristics of various streamwise vortices and azimuthal Kelvin-Helmholtz vortices in the lobed jet flow are revealed clearly and quantitatively from the measurement results of the dual-plane stereoscopic PIV system.

The second part of the talk will describe the recent progress made by the speaker about the development of the Molecular Tagging Velocimetry and Thermometry (MTV&T) techniques for simultaneous temperature and velocity field measurements. Unlike most common-used particle-based techniques, MTV&T techniques utilizes molecules that can be turned into long-lived traces when excited by photons of appropriate wavelength. The unique glamour of the MTV&T techniques will be demonstrated from the application examples of the MTV&T techniques to various complex fluid flow and heat transfer studies. Potential applications of these promising optical diagnostic techniques to other challenging problems like micro-flow, bio-flow and bio-thermal phenomena will also be highlighted.