A5054065909- Combustion and flame dynamics
- Advanced Combustion Engine Technologies
- Combustion and Detonation Processes
- Laser-induced spectroscopy and plasma
- Fire dynamics and safety research
- Sensor Technology and Measurement Systems
- Analytical Chemistry and Sensors
- Nanofabrication and Lithography Techniques
- Radiative Heat Transfer Studies
- Gas Sensing Nanomaterials and Sensors
- Advanced Sensor Technologies Research
- Electrohydrodynamics and Fluid Dynamics
- Heat Transfer and Optimization
- Gas Dynamics and Kinetic Theory
- Experimental Learning in Engineering
- Engineering Applied Research
- Computational Fluid Dynamics and Aerodynamics
- Advanced Machining and Optimization Techniques
- Electrowetting and Microfluidic Technologies
- Manufacturing Process and Optimization
- Phase Equilibria and Thermodynamics
- Conducting polymers and applications
- Electrochemical Analysis and Applications
- Thermography and Photoacoustic Techniques
- Nanomaterials and Printing Technologies
UPMC Altoona
2016-2024
Pennsylvania State University
2012-2024
CNH Industrial (United States)
2020
Electroimpact (United States)
2013
Virginia Tech
2009-2012
National Energy Technology Laboratory
2012
Queen of the Valley Medical Center
2010
U.S. Air Force Institute of Technology
2010
Princeton University
2003-2005
Marshall Space Flight Center
2000
The patterning of sol-gel-derived thin films by micromolding in capillaries can produce unintended topographical deviations from the shape original mold that may limit utility technique potential applications. During drying and heat treatment, nonuniform shrinkage across film due to densification gel matrix results “double-peak” topographies whereby thickness is greater at lateral edges than middle. Using same framework used understand imbibition wetting sol-gel capillary channels, we...
TO MEET increasingly stringent emission standards for nitric oxides, modern gas turbine designs use lean-premixed combustion. While meeting these new environmental standards, leanpremixedcombustion systems introduce some substantial operability concerns with increased susceptibility to blowout, flashback, and instabilities. Significant effort is required overcome design challenges allow turbines operate in an efficient environmentally friendlymanner. This brief communication provides results...
Abstract This paper details a problem-based-learning module for addressing student difficulties in thermodynamics. Using the PYroMat open source software platform to automate more basic skills (like table look-ups and interpolation), learners are called on design cycle meet certain criteria. In we detail here, students provided costs operational data sets of candidate components from which construct Rankine cycle. Students with fuel cost market value electricity, asked make recommendations...
One of the key skills developed in foundational thermodynamics courses is obtaining property and state data for various substances interest. Typically, students are instructed to perform this task through use tables or computer software. In paper, we present evaluate modules teaching foundations using free open-source software intended port students' professional lives. The approach introduces PYro thermodynamic calculator. implemented Python, which available on most widely used platforms....
A novel variation of the Langmuir probe for spatially resolved ion density measurements in a dense flowing plasma is presented. The technique uses spinning disc to rapidly transit wire through flame. Spatial resolution accomplished by post-processing data collected with many locations. resolves 0.5 mm 3000 K atmospheric pressure oxyfuel cutting torch flame under study found have twelve hollow cones 1 base and 4 height 3×1018m −3 along their surface. forms ring, inner diameter which exhibits...
An oxyfuel cutting torch was biased with a positive DC voltage relative to steel and copper work pieces, ion currents were seen flow due ions generated chemically in the flame at surface. A repeatable 150% rise these occurs over surface temperature around 1050°C. Equally strong intermittent spikes appear clean corroded samples alike. They are easily removed by median value filter, believed be small reacting particulates. Tests which salt deliberately deposited on produces signal similar...
Abstract Recent use of ion currents as a sensing strategy in the mechanized oxyfuel cutting process motivated series studies which revealed that steel work piece contributes secondary ions addition to primary classically identified flame. In this work, we present computational model has linked carbon-related chemi-ions source preheating stage subject electric bias voltages. The flames' response field at different positive and negative polarities manifested better understanding physical...
Flame sheet modeling is a common approach for the determination of flame transfer functions prediction and thermoacoustic combustion instabilities.The dynamics flame-sheet model simple geometries can be shown to equivalent basic convective disturbances interacting with steady heat release region.This framework shows that predicted by linearized models are Fourier transform rate profile flamesheet geometry transformed into Lagrangian time reference frame.This result significant relative...
This paper describes a method using electrical characteristics of the torch, flame, and work piece to replace active sensing elements most commonly used for mechanized oxyfuel cutting applications; height, fuel/oxygen ratio, temperature, preheat flow rate. Calibrations are given torch under test standoff accurate ±1/32 in (0.8 mm) F/O ratio ±.008. Methods proposed balancing across multi-torch systems, detecting kindling temperature. Additional is needed if calibrated temperatures be measured...
Insulation obsolescence issues are a major concern for the Reusable Solid Rocket Motor (RSRM). As old sources of raw materials disappear, new must be found and qualified. No simple, inexpensive test presently exists predicting erosion performance candidate insulation in full-scale motor, Large motor tests cost million dollars therefore can only used on few very select candidates. There is need low method screening that simulate some different environments RSRM. This paper describes series...
This research deals with the investigation of a real-life industrial problem excessive weld spatter produced in an automated welding robot cell using gas metal arc process. Spatter generation was attributed to number sources including incorrect machine settings, surface contaminants, and erratic wire feeding. Random variation different process parameters such as voltage, feed speed, torch travel angle, affected production, which served motivation embark on systematic study involving design...
This paper presents numerical and asymptotic analytical solutions for the current–voltage characteristic of a flame using one-dimensional ion transport model with boundary conditions that include detailed treatment sheath formation. Non-dimensional conservation equations are presented free electron, hydronium ion, electrical potential in flow field uniform velocity, mobility, diffusivity, but allowances made non-equilibrium electron temperature. In this study, size location formation region...
Lookup of thermodynamic properties substances is a common task in numerous engineering disciplines and also an important skill taught to students several disciplines.While were traditionally found using tables data, availability modern software has essentially eliminated the need for laborious use tables, created opportunities support quick iteration revision calculations.As data are published variety formats, it necessary provide standardized interface operate on number different source...
Abstract This is a study of the suitability preheat flame electrical resistance as potential method for measuring standoff distance an oxyfuel cutting torch and work piece. Careful scrutiny forty-seven individual experiments demonstrate that when cut quality good, there linear repeatable relationship between two with uncertainty about ±0.3 mm (0.015 in.). As degrades, formation top-edge dross reduces path length in flame, momentary reduction reaction rate kerf free electrons causing...