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Full-Text Articles in Engineering
Effects Of Air-Injection Pressure On Airflow Pattern Of Air Sparging, Arvin Farid, Atena Najafi, Jim Browning, Elisa Barney Smith
Effects Of Air-Injection Pressure On Airflow Pattern Of Air Sparging, Arvin Farid, Atena Najafi, Jim Browning, Elisa Barney Smith
Civil Engineering Faculty Publications and Presentations
Air sparging is a remediation technology for treating soil/groundwater contaminated with volatile organic compounds (VOCs). VOC removal during air sparging is rendered less effective because of the random formation of air channels, creating preferential paths for airflow, thus limiting remediation to these channels, referred to as a zone of influence (ZOI). Pulsation is a popular method used to improve the effectiveness of air sparging through cyclic operation, with the hope that air channels would form elsewhere. Pulsation makes air sparging more time-consuming. This paper studies the effects of one cycle of pulsation and air pressure on the airflow pattern and …
Fractional Order State Feedback Control For Improved Lateral Stability Of Semi-Autonomous Commercial Heavy Vehicles, Rasheed Mazen Abdulkader
Fractional Order State Feedback Control For Improved Lateral Stability Of Semi-Autonomous Commercial Heavy Vehicles, Rasheed Mazen Abdulkader
Graduate Theses and Dissertations
With the growing development of autonomous and semi-autonomous large commercial heavy vehicles, the lateral stability control of articulated vehicles have caught the attention of researchers recently. Active vehicle front steering (AFS) can enhance the handling performance and stability of articulated vehicles for an emergency highway maneuver scenario. However, with large vehicles such tractor-trailers, the system becomes more complex to control and there is an increased occurrence of instabilities. This research investigates a new control scheme based on fractional calculus as a technique that ensures lateral stability of articulated large heavy vehicles during evasive highway maneuvering scenarios. The control method is …
Study Of Mechanisms Governing Electromagnetic Alteration Of Hydraulic Conductivity Of Soils, Atena Najafi, Sahba Azad, Arvin Farid, Jim Browning, Elisa Barney Smith
Study Of Mechanisms Governing Electromagnetic Alteration Of Hydraulic Conductivity Of Soils, Atena Najafi, Sahba Azad, Arvin Farid, Jim Browning, Elisa Barney Smith
Civil Engineering Faculty Publications and Presentations
Hydraulic conductivity is a measure of the rate at which water flows through porous media. Because of the dipole properties of water molecules, electric field can affect hydraulic conductivity. In this study, the effect of radio-frequency (RF) waves on hydraulic conductivity is investigated. This is important both for the geophysical measurement of hydraulic conductivity as well as remediation using electromagnetic waves. Bentonite clay and sandy samples are tested in rigid-wall, cylindrical permeameters and stimulated using a CPVC-cased monopole antenna vertically centered in the permeameters. The permeameters are encased within RF cavities constructed of aluminum mesh in order to prevent interference …
Laboratory Study Of The Effect Of Electromagnetic Waves On Airflow During Air Sparging, Atena Najafi, Vahab Bolvardi, Arvin Farid, Jim Browning, Elisa Barney Smith
Laboratory Study Of The Effect Of Electromagnetic Waves On Airflow During Air Sparging, Atena Najafi, Vahab Bolvardi, Arvin Farid, Jim Browning, Elisa Barney Smith
Civil Engineering Faculty Publications and Presentations
Air sparging is a technique that uses the injection of a gas (e.g., air, oxygen) into the subsurface to remediate saturated soils and groundwater contaminated with volatile organic compounds (VOCs). Contaminant-removal efficiency and air-sparging performance are highly dependent on the pattern and type of airflow. Airflow, however, suffers from air channel formation (i.e., preferential paths for airflow), limiting remediation to smaller contaminated zones. This paper presents the results of experimental work investigating the possibility of controlling and improving airflow patterns through a saturated glass-bead medium using electromagnetic (EM) waves to enhance air sparging. The test setup consists of a resonant …
Electromagnetic Stimulation Of Transport In Water For Geoenvironmental Applications, A. Farid, M. Azad, J. Browning, Elisa H. Barney Smith
Electromagnetic Stimulation Of Transport In Water For Geoenvironmental Applications, A. Farid, M. Azad, J. Browning, Elisa H. Barney Smith
Civil Engineering Faculty Publications and Presentations
Air sparging is a popular soil remediation technique that enables the removal of contaminants by diffusing air into saturated zones of soil. The removal process is, however, slow. The goal of this work is to study the effect of electromagnetic (EM) waves - with minimal heat generation - on transport mechanisms such as diffusion, in order to improve airflow or contaminant transport and expedite the cleanup process using air sparging or similar technologies. This effect is studied through an experimental setup that examines the diffusion of a nonreactive dye in water under EM waves at a range of frequencies between …
Interaction Between Electromagnetic Waves And Transport In Saturated Media, Mahsa Azad, Harlan Sangrey, Arvin Farid, Jim Browning, Elisa Barney Smith
Interaction Between Electromagnetic Waves And Transport In Saturated Media, Mahsa Azad, Harlan Sangrey, Arvin Farid, Jim Browning, Elisa Barney Smith
Civil Engineering Faculty Publications and Presentations
Air sparging is one of the most popular remediation technologies. However, it is limited to a small radius of influence (ROI) surrounding the air injection well. Hence, there have been several efforts to improve its effectiveness. To study the possibility of improving the effectivity of air sparging electromagnetic (EM) waves, an easily visible analogous problem (dye transport in water) is studied in this paper. In order to quantify the effects of EM stimulation on flow of an inert, nonreactive dye in water, EM-stimulated and unstipulated dye transport experiments tests were performed and compared. To quantify this interaction, both dye transport …