"Turbulence and Fluid Dynamics Research and The Ubiquitous Turbulent Round Jet"

Andrew Pollard, Department of Mechanical and Materials Engineering, Queen's University

In this seminar I will discuss research activities that are ongoing in the Computational and Experimental Fluid Dynamics Laboratory at Queen's University. We use the three legs of 21st century science: high performance computing, particle image velocimetry and hot wire anemometry and theory to explore some fundamental questions in turbulent fluid flow. These range from biological flows in the human airway, emboli detection during open heart surgery, "simple" round free jets and activities associated with transformational technologies to replace fossil fuel with biomass. I will also present some "3D" videos… glasses will be provided!

From this survey of activity, I will drill down to explore our recent work on round free jets that have been interrogated for 6,000<Re<100,000 over a axial region of 0<x/D<30 using a novel flying hot wire system. We investigate "mixing transition" in the jet and consider the non-homogenous distribution of a variety of length scales as well as the use of compensated one-dimensional spectra to clearly demonstrate mixing transition occurs at the appearance of the inertial sub-range of turbulence.

Professor Pollard is a Queen's Research Chair in Fluid Dynamics and Multi-scale Phenomena. He obtained his PhD from the University of London (Imperial College) in 1978 under the supervision of Professor D. B. Spalding. Since then, he has supervised over 50 graduate student theses, and published over 200 papers. He is currently the Director of the Queen's Collaborative Programme in Computational Science and Engineering and Director of the Sustainable Bioeconomy Centre.

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