RECENT RESEARCH
RECENT RESEARCH
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Aerodynamics of elevated roughness arrays
Co-investigator: Dr. Jack Gillies, Desert Research Institute, NV
Influence of wall mounted roughness element porosity on surrounding airflow structure for planar versus and adjusted bed surfaces
Co-investigator: Dr. Jack Gillies, Desert Research Institute, NV
Entrainment, suspension and deposition rate of Icelandic dust
PhD Alumnus: Tamar Richards-Thomas
Analysis of particle dynamics in 3-D using Particle Tracking Velocimetry
Postdoctoral Fellow: Patrick O'Brien
Simulation of dust emission from Owens Lake sediments: Effects of varied pore water content and humidity
Co-investigator: Dr. William Nickling, Nickling Environmental Ltd.
This video was captured for the Trent School of the Environment Seminar Series 02/12/2021. It demonstrates some of the basic features of particle transport by wind using highly visible Styrofoam packing chips.
When your lab coat is a parka!
Graduate students Gianna Saarenvirta (left), Christopher Scweighofter (right) and Lukas Meldau (not shown; Xi'an Jiaotong-Liverpool University ) have been braving a wide range of climate conditions in the wind tunnel lab in order to understand their effects on the saltation cloud, particle spalling, dust emission and boundary-layer flow.
This work marks a return to experiments carried out in the TEWT two decades ago, now with more sophisticated instrumentation and a broader set of objectives.
High Speed and time lapse Video footage from TEWT
High Speed and time lapse Video footage from TEWT
DUST EMISSION TESTING
DUST EMISSION TESTING
Surfaces across the globe vary greatly in the amount of dust they emit, with this being highly dependent on the texture of the material, the amount and and nature of their cohesion, and the temperature and humidity of the airflow. TEWT routinely carries out emission rate testing under full climate control for a range of materials, inclusive of natural sediments, mine tailings and slag. This short video shows a test in progress in which we are evaluating the efficiecy of a commercial dust supressant. The live screen display shows the instantaneous PM 2.5 and PM10 concentrations in vertical profile.
Dust ejection with raindrop impact in still air (TOP) and in a 4 m/s shearing flow (BOTTOM).
Dust ejection with raindrop impact in still air (TOP) and in a 4 m/s shearing flow (BOTTOM).
Test bed material: Eyjafjallajokull volcanic ash from the 2010 eruption in Iceland
Video captured by Tamar Richards-Thomas, ENLS PhD Candidate
Saltation and Splash
Saltation and Splash
Wind speed: 7 m/s
Sand diameter: 300 um.
Test bed length: 16 meters
Video captured by Patrick O'Brien, PhD 2018
(Video provided from TEWT's YouTube Channel.)
Granular Ripple Formation
Granular Ripple Formation
Time lapse photography of impact ripple formation in sand bed comprised of 5% coarse particles (by mass). Wind direction is left to right, with a freestream velocity of 9 m/s. Photograph interval of 3 seconds totaling 50 minutes elapsed time.
Video captured by Otto Bedard, MSc 2013
(Video provided from TEWT's YouTube Channel.)
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