Steve Wereley [1] is a professor of mechanical engineering at Purdue University. [2] His areas of research include Micro- and Nanofluidics, Particle Image Velocimetry, Opto-microfluidics and bio-MEMS. He is the co-inventor of micro-PIV. [3]
Steve Wereley [1] is a professor of mechanical engineering at Purdue University. [2] His areas of research include Micro- and Nanofluidics, Particle Image Velocimetry, Opto-microfluidics and bio-MEMS. He is the co-inventor of micro-PIV. [3]
In 1990, Wereley completed his undergraduate degrees in mechanical engineering at Washington University in St. Louis, and physics at Lawrence University. Wereley earned M.S. and Ph.D. degrees from Northwestern University in 1992 and 1997, respectively. He spent two years working with Carl Meinhart at the University of California Santa Barbara, specializing in microfluidic diagnostic techniques.
In 1999, Wereley became an assistant professor of mechanical engineering at Purdue University. In 2005, Wereley was promoted to associate professor and in 2010 to professor.
Wereley played an important role in assessing the Deepwater Horizon oil spill in the summer of 2010. On May 13, 2010, he was among the first scientists to report that the actual flow rate of oil out of the well was considerably higher than the official estimate at the time. [4] [5] [6] After the disaster the National Commission on the BP Deepwater Horizon Oil Spill and Offshore Drilling found that the "...Wereley estimates (and at least some of BP‘s internal estimates) proved to be significantly more accurate than the initial official estimates." [7] Wereley was invited to brief the House Subcommittee on Energy and the Environment about his findings. [8] He was also asked to join the Flow Rate Technical Group (FRTG), a group of scientists assembled by the Department of the Interior to address the flow rate issue. [9] The FRTG issued a final peer-reviewed report on July 21, 2010, [10] and contributed to the official US government oil flow rate estimate announced on August 2, 2010. [11] In October 2010 Wereley was awarded the United States Geological Survey Director's Award for his work on the FRTG team. [12]
Particle image velocimetry (PIV) is an optical method of flow visualization used in education and research. It is used to obtain instantaneous velocity measurements and related properties in fluids. The fluid is seeded with tracer particles which, for sufficiently small particles, are assumed to faithfully follow the flow dynamics. The fluid with entrained particles is illuminated so that particles are visible. The motion of the seeding particles is used to calculate speed and direction of the flow being studied.
Velocimetry is the measurement of the velocity of fluids. This is a task often taken for granted, and involves far more complex processes than one might expect. It is often used to solve fluid dynamics problems, study fluid networks, in industrial and process control applications, as well as in the creation of new kinds of fluid flow sensors. Methods of velocimetry include particle image velocimetry and particle tracking velocimetry, Molecular tagging velocimetry, laser-based interferometry, ultrasonic Doppler methods, Doppler sensors, and new signal processing methodologies.
Molecular tagging velocimetry (MTV) is a specific form of flow velocimetry, a technique for determining the velocity of currents in fluids such as air and water. In its simplest form, a single "write" laser beam is shot once through the sample space. Along its path an optically induced chemical process is initiated, resulting in the creation of a new chemical species or in changing the internal energy state of an existing one, so that the molecules struck by the laser beam can be distinguished from the rest of the fluid. Such molecules are said to be "tagged".
Particle tracking velocimetry (PTV) is a velocimetry method i.e. a technique to measure velocities and trajectories of moving objects. In fluid mechanics research these objects are neutrally buoyant particles that are suspended in fluid flow. As the name suggests, individual particles are tracked, so this technique is a Lagrangian approach, in contrast to particle image velocimetry (PIV), which is an Eulerian method that measures the velocity of the fluid as it passes the observation point, that is fixed in space. There are two experimental PTV methods:
Flow visualization or flow visualisation in fluid dynamics is used to make the flow patterns visible, in order to get qualitative or quantitative information on them.
Planar Doppler Velocimetry (PDV), also referred to as Doppler Global Velocimetry (DGV), determines flow velocity across a plane by measuring the Doppler shift in frequency of light scattered by particles contained in the flow. The Doppler shift, Δfd, is related to the fluid velocity. The relatively small frequency shift is discriminated using an atomic or molecular vapor filter. This approach is conceptually similar to what is now known as Filtered Rayleigh Scattering.
An engine test stand is a facility used to develop, characterize and test engines. The facility, often offered as a product to automotive OEMs, allows engine operation in different operating regimes and offers measurement of several physical variables associated with the engine operation.
The Deepwater Horizon oil spill was an environmental disaster which began on 20 April 2010, off the coast of the United States in the Gulf of Mexico on the BP-operated Macondo Prospect, considered the largest marine oil spill in the history of the petroleum industry and estimated to be 8 to 31 percent larger in volume than the previous largest, the Ixtoc I oil spill, also in the Gulf of Mexico. Caused in the aftermath of a blowout and explosion on the Deepwater Horizon oil platform, the United States federal government estimated the total discharge at 4.9 MMbbl. After several failed efforts to contain the flow, the well was declared sealed on 19 September 2010. Reports in early 2012 indicated that the well site was still leaking. The Deepwater Horizon oil spill is regarded as one of the largest environmental disasters in world history.
On April 20, 2010, an explosion and fire occurred on the Deepwater Horizon semi-submersible mobile offshore drilling unit, which was owned and operated by Transocean and drilling for BP in the Macondo Prospect oil field about 40 miles (64 km) southeast off the Louisiana coast. The explosion and subsequent fire resulted in the sinking of the Deepwater Horizon and the deaths of 11 workers; 17 others were injured. The same blowout that caused the explosion also caused an oil well fire and a massive offshore oil spill in the Gulf of Mexico, considered the largest accidental marine oil spill in the world, and the largest environmental disaster in United States history.
Matched Index of Refraction is a facility located at the Idaho National Laboratory built in the 1990s. The purpose of the fluid dynamics experiments in the MIR flow system at Idaho National Laboratory (INL) is to develop benchmark databases for the assessment of Computational Fluid Dynamics (CFD) solutions of the momentum equations, scalar mixing, and turbulence models for the flow ratios between coolant channels and bypass gaps in the interstitial regions of typical prismatic standard fuel element or upper reflector block geometries of typical Very High Temperature Reactors (VHTR) in the limiting case of negligible buoyancy and constant fluid properties.
The following is a timeline of the Deepwater Horizon oil spill. It was a massive oil spill in the Gulf of Mexico, the largest offshore spill in U.S. history. It was a result of the well blowout that began with the Deepwater Horizon drilling rig explosion on April 20, 2010.
The Flow Rate Technical Group is a group of scientists and engineers from the United States federal government, universities, and research institutions created May 19, 2010, for an official scientific-based estimate of the flow of oil in the Deepwater Horizon oil spill. It issued an interim report on May 27. It was convened again on June 10 by Coast Guard Admiral Thad Allen after the drilling riser from the well was cut by Maxx3 ROV Dive #35 on May 31, 2010, in an attempt to redirect the flow. Large amounts of oil were not being captured and the group was convened to estimate how much.
Following is a Timeline of the Deepwater Horizon oil spill for May 2010.
The Deepwater Horizon investigation included several investigations and commissions, among others reports by National Incident Commander Thad Allen, United States Coast Guard, National Commission on the BP Deepwater Horizon Oil Spill and Offshore Drilling, Bureau of Ocean Energy Management, Regulation and Enforcement, National Academy of Engineering, National Research Council, Government Accountability Office, National Oil Spill Commission, and Chemical Safety and Hazard Investigation Board.
The Deepwater Horizon oil spill was discovered on the afternoon of 22 April 2010 when a large oil slick began to spread at the former rig site. According to the Flow Rate Technical Group, the leak amounted to about 4.9 million barrels of oil, exceeding the 1989 Exxon Valdez oil spill as the largest ever to originate in U.S.-controlled waters and the 1979 Ixtoc I oil spill as the largest spill in the Gulf of Mexico. BP has challenged this calculation saying that it is overestimated as it includes over 810,000 barrels of oil which was collected before it could enter the Gulf waters.
Magnetic resonance velocimetry (MRV) is an experimental method to obtain velocity fields in fluid mechanics. MRV is based on the phenomenon of nuclear magnetic resonance and adapts a medical magnetic resonance imaging system for the analysis of technical flows. The velocities are usually obtained by phase contrast magnetic resonance imaging techniques. This means velocities are calculated from phase differences in the image data that has been produced using special gradient techniques. MRV can be applied using common medical MRI scanners. The term magnetic resonance velocimetry became current due to the increasing use of MR technology for the measurement of technical flows in engineering.
Igor Mezić is a mechanical engineer, mathematician, and Distinguished Professor of mechanical engineering and mathematics at the University of California, Santa Barbara. He is best known for his contributions to operator theoretic, data driven approach to dynamical systems theory that he advanced via articles based on Koopman operator theory, and his work on theory of mixing, that culminated in work on microfluidic mixer design, and mapping oil refuse from the Deepwater Horizon oil spill in the Gulf of Mexico to aid in cleaning efforts.
Joseph Katz is an Israel-born American fluid dynamicist, known for his work on experimental fluid mechanics, cavitation phenomena and multiphase flow, turbulence, turbomachinery flows and oceanography flows, flow-induced vibrations and noise, and development of optical flow diagnostics techniques, including Particle Image Velocimetry (PIV) and Holographic Particle Image Velocimetry (HPIV). As of 2005, he is the William F. Ward Sr. Distinguished Professor at the Department of Mechanical Engineering of the Whiting School of Engineering at the Johns Hopkins University.
Pavlos P. Vlachos is a Greek-American engineer, scientist, academic, and entrepreneur. He is professor in Purdue’s School of Mechanical Engineering and in the Weldon School of Biomedical Engineering, and the St. Vincent Health Professor of Healthcare Engineering. He serves as the Director for the Purdue Regenstrief Center for Healthcare Engineering (RCHE).
Arezoo M. Ardekani is an Iranian-American physicist who is a professor at Purdue University. Her research considers the flow of complex fluids. She was elected a Fellow of the American Society of Mechanical Engineers in 2020 and a Fellow of the American Physical Society in 2022.
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