FLUID AND PARTICLE DYNAMICS IN AN AEROSOL VIRTUAL IMPACTOR

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dc.contributor.advisorCalabrese, Richard Ven_US
dc.contributor.authorCharrouf, Marwanen_US
dc.contributor.departmentChemical Engineeringen_US
dc.date.accessioned2004-06-04T05:37:22Z
dc.date.available2004-06-04T05:37:22Z
dc.date.issued2004-05-03en_US
dc.description.abstractThe collection and characterization of chemical and biological aerosols is essential to many areas of particle research such as toxicological studies, pollutant sampling, and biohazard assessment. This work presents the simulation of a low cutpoint, high volume aerosol sampling device known as the "virtual impactor". A steady state, three dimensional RANS type calculation is done using the FLUENT(TM) computational fluid dynamics code to predict the turbulent flow field inside the device. Particle collection efficiency and wall losses are then obtained by solving the particle equation of motion governed by drag for mono-dispersed samples of spherical particles in the 0.1-0.4 micro-meter diameter range. Predictions of the mean fluid velocity field with the incompressible Reynolds stress model and the compressible k-epsilon turbulence model are relied upon for conducting particle tracking calculations. FORTRAN 90 computer code is developed to solve the particle equation of motion using an implicit second order accurate time integration scheme. In addition, a multi-variate, scattered point interpolation method is implemented to obtain the fluid velocity at a position away from an Eulerian mesh point. It is found that "adaptive" drag law models are necessary to correctly account for slip and compressibility. The results indicate the trends observed in the experiments, and a 50% cutpoint diameter between 0.250 and 0.275 micro-meter. Recommendations for improved modeling in future work are made.en_US
dc.format.extent6098361 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/1903/1422
dc.language.isoen_US
dc.relation.isAvailableAtDigital Repository at the University of Marylanden_US
dc.relation.isAvailableAtUniversity of Maryland (College Park, Md.)en_US
dc.subject.pqcontrolledEngineering, Chemicalen_US
dc.subject.pquncontrolledSimulationen_US
dc.subject.pquncontrolledModelingen_US
dc.subject.pquncontrolledVirtual Impactoren_US
dc.subject.pquncontrolledAerosolen_US
dc.subject.pquncontrolledCFDen_US
dc.subject.pquncontrolledParticle Trackingen_US
dc.titleFLUID AND PARTICLE DYNAMICS IN AN AEROSOL VIRTUAL IMPACTORen_US
dc.typeThesisen_US

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