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Collection of Micron Particles in a Continuous Open Water Channel System

Martin, Michael D.
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1313756062

Abstract Details

2011, MS, University of Cincinnati, Engineering and Applied Science: Mechanical Engineering.
A continuous particle collection system was designed and optimized for the collection of PSL particles (aerodynamic diameter = 2 µm) into a continuous water flow. The particle size of 2 µm was selected in order to design the system to collect fungal spores which have aerodynamic diameters in that range. The collection system was composed of an open channel collector and a transport channel transferring the collected particles to a measurement site. The water concentration was estimated by particle counting utilizing inverted fluorescent microscopy. The dynamic collection efficiency was measured at the measurement site with time data. The static collection efficiency was calculated by sampling the total collected liquid after the test was completed. The collector with a 45 degree angled nozzle produced a peak static collection efficiency of 89.5 + 7.5 %, at a Stokes number of 0.62. The water flow rate was required to be above 0.3 ml/min, and the surfactant concentration above 0.1 %, in order to reduce particle losses. When the water flow rate was between 0.3 – 1.0 ml/min, the average static collection efficiency was 87.9 + 7.9 %. When the surfactant concentration was between 0.1 - 0.4 %, the average static collection efficiency was 89.6 + 7.0 %. A constant concentration of aerosol was collected and measured with time data at the measurement site. The dynamic measurement system was tested at two water flow rates of 1 ml/min and 2 ml/min, producing total dynamic collection efficiencies of 74.1 + 5.7 % and 71.4 + 6.5 %, respectively. The response time was found to be 1.15 minutes when the water flow rate was 2 ml/min, while it was 2.15 minutes when the water flow rate was 1 ml/min. With the transport length (distance between the collector and measurement point) reduced from 455 mm to 200 mm, the total dynamic collection efficiency was 75.5 + 9.2 % and the response time decreased to 0.58 minutes. Also, the decay time was decreased from 3.49 minutes in the 1 ml/min case to 1.68 minutes. It was concluded that reducing the transport length and increasing the water flow rate will effectively decrease the response and decay times.
Sang Young Son, PhD (Committee Chair)
J. Kim, PhD (Committee Member)
Tiina Reponen, PhD (Committee Member)
77 p.
Mechanics
Particle Collection; Impinger

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Citations

  • Martin, M. D. (2011). Collection of Micron Particles in a Continuous Open Water Channel System [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1313756062

    APA Style (7th edition)

  • Martin, Michael. Collection of Micron Particles in a Continuous Open Water Channel System. 2011. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1313756062.

    MLA Style (8th edition)

  • Martin, Michael. "Collection of Micron Particles in a Continuous Open Water Channel System." Master's thesis, University of Cincinnati, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1313756062

    Chicago Manual of Style (17th edition)

ucin1313756062
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© 2011, all rights reserved.
This open access ETD is published by University of Cincinnati and OhioLINK.