Theses and Dissertations from UMD

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New submissions to the thesis/dissertation collections are added automatically as they are received from the Graduate School. Currently, the Graduate School deposits all theses and dissertations from a given semester after the official graduation date. This means that there may be up to a 4 month delay in the appearance of a give thesis/dissertation in DRUM

More information is available at Theses and Dissertations at University of Maryland Libraries.

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Author: search.filters.author.Kommer, EricSubject: search.filters.subject.Engineering, Mechanical

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    VARIATIONS OF ENGINE PARTICULATE MATTER IN A MINIATURE DILUTION TUNNEL
    (2003-12-12) Kommer, Eric; Buckley, Steven G; Mechanical Engineering
    Measurement of diesel and spark ignition engine particulate emissions is of wide interest due to current research demonstrating that inhalation of nanoparticles may cause serious health problems. Both experimental and computational methods were used to investigate fluid and particle flows through a miniature dilution tunnel similar to those commonly used to sample particulate emissions from engines to help explain observed varabilities and bias, and to improve the repeatability of results. Laser Doppler Velocimetry, flow visualization, and a commercial CFD code were used to measure the flow field inside the apparatus. Slugs of NOx calibration gas and a high speed NOx concentration meter were used to measure mean velocities through the apparatus. An artificial aerosol generator was used in conjunction with a Scanning Mobility Particle Sizer (SMPS) to determine how tunnel geometry affects particle size distributions. These results were compared to a Monte Carlo type numerical simulation, accounting for Brownian motion and fluctuating turbulent velocities.