November 2009
Physics of Flame Blowoff Limit Behavior in Bluff-Body Stabilized Premixed Turbulent Combustion (WPI Only)
Wednesday, 11/11/2009 2:00 PM-3:00 PM
Higgins Laboratories, HL218
Professor Baki Cetegen
University of Connecticut
Abstract : Stability characteristics (blowoff, flashback and flame response to flow oscillations) are important considerations in the design and operation of highly energetic combustion devices such as gas turbine combustors, afterburners, furnaces and rockets. Of particular interest is the flame behavior under fuel lean combustion conditions since many pollution reduction schemes are based on fuel lean combustion. Under such conditions, flames are susceptible to external perturbations and they can detach from flame holders and blow off. In this presentation, a detailed experimental study of bluff-body stabilized premixed flames is described in three parts. In the first part, the flame blowoff conditions are characterized and the physical reasons for the flame blowoff are elucidated using particle image velocimetry (PIV) and OH-planar laser induced fluorescence (PLIF) data. In the second part, results from experiments with imposed fuel-air mixture gradients upstream of the flame holder are described in terms of its blowoff behavior and response function to imposed flow oscillations. Finally, utility of CH* chemiluminescence signal from the flame stabilization zone as a flame blowoff precursor is discussed.
For more information, e-mail mdemetri@wpi.edu or call 508-831-5459.
December 2009
The Role of Bubbles and Acoustic Cavitation in Biomedical Ultrasound (WPI Only)
Wednesday, 12/9/2009 2:00 PM-3:00 PM
Higgins Laboratories, Room 218
Ronald A. Roy
Dept. of Mechanical Engineering
Boston University
Abstract:
It is well known that ultrasound has found a home in medicine. Scattered ultrasound waves provide a means for imaging organs, blood flow, and tissue structure. High intensity ultrasound can remotely ablate tissue volumes as small as a grain of rice. What is not well known is microscopic bubbles are implicated in many of these processes. Microbubbles enhance blood flow imaging and high intensity sound can generate bubbles in situ, a process known as acoustic cavitation. Cavitation bubbles convert acoustical energy to a form of mechanical energy that is highly concentrated in both space and time, resulting in a plethora of effects ranging from accelerated tissue heating to tissue ablation, from sonoporation to microscopic streaming. These "mechanical bioeffects" play a role in a broad range of diagnostic and therapeutic procedures involving ultrasound. We present an introductory overview of the relevant bubble physics and the roles played by bubbles and cavitation in biomedical ultrasonics.
For more information, e-mail mdemetri@wpi.edu or call 508-831-5459.
January 2010
Fundamentals of Bulk Solids Storage and Handling (WPI Only)
Wednesday, 1/20/2010 2:00 PM-3:00 PM
Higgins Laboratories, HL218
Mr. Eric P. Maynard
Senior Consultant
Jenike & Johanson, Inc.
Abstract: Handling and processing powders and bulk solids is fraught with problems, whether one is dealing with chemicals, plastics, pharmaceuticals, foods, powdered metals, or a myriad of other materials. These problems often result in lost production time, maintenance costs and bottlenecks in the process. This seminar will provide insights into common flow problems that arise when powders and bulk solids are put into silos, bins, and hoppers.
The basic technology to solve these type of problems will be discussed along with the characterization of bulk material flow properties. Finally, some areas of research in this field will be presented. This topic is critical to all industries in which bulk solids are being handled, processed, or refined because greater emphasis is being placed on process optimization, safety, and cost reductions, all of which are often dependent upon reliable bulk solids handling.
For more information, e-mail mdemetri@wpi.edu or call 508-831-5459.
Multicomponent Population Balance Modeling of Pharmaceutical Granulation (WPI Only)
Wednesday, 1/27/2010 2:00 PM-3:00 PM
Higgins Laboratories, HL218
Professor Themis Matsoukas
Department of Chemical Engineering
Penn State University
Abstract : To be advised
For more information, e-mail mdemetri@wpi.edu or call 508-831-5459.
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November 2009
Physics of Flame Blowoff Limit Behavior in Bluff-Body Stabilized Premixed Turbulent Combustion (WPI Only)
Wednesday, 11/11/2009 2:00 PM-3:00 PM
Higgins Laboratories, HL218
Professor Baki Cetegen
University of Connecticut
Abstract : Stability characteristics (blowoff, flashback and flame response to flow oscillations) are important considerations in the design and operation of highly energetic combustion devices such as gas turbine combustors, afterburners, furnaces and rockets. Of particular interest is the flame behavior under fuel lean combustion conditions since many pollution reduction schemes are based on fuel lean combustion. Under such conditions, flames are susceptible to external perturbations and they can detach from flame holders and blow off. In this presentation, a detailed experimental study of bluff-body stabilized premixed flames is described in three parts. In the first part, the flame blowoff conditions are characterized and the physical reasons for the flame blowoff are elucidated using particle image velocimetry (PIV) and OH-planar laser induced fluorescence (PLIF) data. In the second part, results from experiments with imposed fuel-air mixture gradients upstream of the flame holder are described in terms of its blowoff behavior and response function to imposed flow oscillations. Finally, utility of CH* chemiluminescence signal from the flame stabilization zone as a flame blowoff precursor is discussed.
For more information, e-mail mdemetri@wpi.edu or call 508-831-5459.
December 2009
The Role of Bubbles and Acoustic Cavitation in Biomedical Ultrasound (WPI Only)
Wednesday, 12/9/2009 2:00 PM-3:00 PM
Higgins Laboratories, Room 218
Ronald A. Roy
Dept. of Mechanical Engineering
Boston University
Abstract:
It is well known that ultrasound has found a home in medicine. Scattered ultrasound waves provide a means for imaging organs, blood flow, and tissue structure. High intensity ultrasound can remotely ablate tissue volumes as small as a grain of rice. What is not well known is microscopic bubbles are implicated in many of these processes. Microbubbles enhance blood flow imaging and high intensity sound can generate bubbles in situ, a process known as acoustic cavitation. Cavitation bubbles convert acoustical energy to a form of mechanical energy that is highly concentrated in both space and time, resulting in a plethora of effects ranging from accelerated tissue heating to tissue ablation, from sonoporation to microscopic streaming. These "mechanical bioeffects" play a role in a broad range of diagnostic and therapeutic procedures involving ultrasound. We present an introductory overview of the relevant bubble physics and the roles played by bubbles and cavitation in biomedical ultrasonics.
For more information, e-mail mdemetri@wpi.edu or call 508-831-5459.
January 2010
Fundamentals of Bulk Solids Storage and Handling (WPI Only)
Wednesday, 1/20/2010 2:00 PM-3:00 PM
Higgins Laboratories, HL218
Mr. Eric P. Maynard
Senior Consultant
Jenike & Johanson, Inc.
Abstract: Handling and processing powders and bulk solids is fraught with problems, whether one is dealing with chemicals, plastics, pharmaceuticals, foods, powdered metals, or a myriad of other materials. These problems often result in lost production time, maintenance costs and bottlenecks in the process. This seminar will provide insights into common flow problems that arise when powders and bulk solids are put into silos, bins, and hoppers.
The basic technology to solve these type of problems will be discussed along with the characterization of bulk material flow properties. Finally, some areas of research in this field will be presented. This topic is critical to all industries in which bulk solids are being handled, processed, or refined because greater emphasis is being placed on process optimization, safety, and cost reductions, all of which are often dependent upon reliable bulk solids handling.
For more information, e-mail mdemetri@wpi.edu or call 508-831-5459.
Multicomponent Population Balance Modeling of Pharmaceutical Granulation (WPI Only)
Wednesday, 1/27/2010 2:00 PM-3:00 PM
Higgins Laboratories, HL218
Professor Themis Matsoukas
Department of Chemical Engineering
Penn State University
Abstract : To be advised
For more information, e-mail mdemetri@wpi.edu or call 508-831-5459.
Powered by the Social Web - Bringing people together through Events, Places, & Common Interests