Browsing by Subject "Aerosol"
Now showing items 1-13 of 13
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Ambient aerosol sampling inlet for flow rates of 100 and 400 l/min
(2009-05-15)New bioaerosol sampling inlets were designed and tested that have nominal exhaust flow rates of 100 L/min to 400 L/min, and which have internal fractionators and screens to scalp large, unwanted particles and debris from ... -
Analyzing Growth, Hygroscopicity and Climate Effects of Atmospheric Particles at the Arm SGP Site
(2017-06-27)Particle size and size resolved hygroscopicity distributions measured at the ARM SGP site from 2009 to 2012 were used to study new particle formation (NPF) and subsequent growth, variation in hygroscopicity and mixing state ... -
Application of computational fluid dynamics to aerosol sampling and concentration
(2009-05-15)An understanding of gas-liquid two-phase interactions, aerosol particle deposition, and heat transfer is needed. Computational Fluid Dynamics (CFD) is becoming a powerful tool to predict aerosol behavior for related design ... -
The application of size- resolved hygroscopicity measurements to understand the physical and chemical properties of ambient aerosol
(Texas A&M University, 2005-08-29)During the summer of 2002, a modified tandem differential mobility analyzer (TDMA) was used to examine the size-resolved hydration state of the ambient aerosol in Southeast Texas. Although there were slight variations ... -
Computational Fluid Dynamics Study of Aerosol Transport and Deposition Mechanisms
(2012-07-16)In this work, various aerosol particle transport and deposition mechanisms were studied through the computational fluid dynamics (CFD) modeling, including inertial impaction, gravitational effect, lift force, interception, ... -
Direct numerical simulation of particle-laden turbulence in a straight square duct
(Texas A&M University, 2004-09-30)Particle-laden turbulent flow through a straight square duct at Reτ = 300 is studied using direct numerical simulation (DNS) and Lagrangian particle tracking. A parallelized 3-D particle tracking direct numerical simulation ... -
The Evolution of the Physicochemical Properties of Aerosols in the Atmosphere
(2011-02-22)A Differential Mobility Analyzer/Tandem Differential Mobility Analyzer (DMA/TDMA) system was used to measure simultaneously the size distribution and hygroscopicity of the ambient aerosol population. The system was operated ... -
Flammability and Combustion Behaviors in Aerosols Formed by Industrial Heat Transfer Fluids Produced by the Electrospray Method
(2012-10-19)The existence of flammable aerosols presents a high potential for fire hazards in the process industry. Various industrial fluids, most of which operate at elevated temperatures and pressures, can be atomized when released ... -
Light Scattering Problem and its Application in Atmospheric Science
(2011-02-22)The light scattering problem and its application in atmospheric science is studied in this thesis. In the first part of this thesis, light scattering theory of single irregular particles is investigated. We first introduce ... -
Observations of Secondary Organic Aerosol Production and Soot Aging under Atmospheric Conditions Using a Novel Environmental Aerosol Chamber
(2012-02-14)Secondary organic aerosols (SOA) comprise a substantial fraction of the total global aerosol budget. While laboratory studies involving smog chambers have advanced our understanding of the formation mechanisms responsible ... -
The seasonality of aerosol properties in Big Bend National Park
(Texas A&M University, 2007-04-25)Two-week sampling periods during the spring, summer, and fall of 2003, and the winter of 2004 were conducted utilizing a tandem differential mobility analyzer (TDMA) and, during the spring and summer, an aerodynamic particle ... -
Study of formation and convective transport of aerosols using optical diagnostic technique
(Texas A&M University, 2004-09-30)The characteristics of liquid and solid aerosols have been intensively investigated by means of optical diagnostic techniques. Part I describes the characteristics of liquid aerosol formation formed by heat transfer fluids ... -
A two-stage 100 l/min circumferential slot virtual impactor system for bioaerosol concentration
(2009-05-15)A two -stage circumferential slot virtual impactor aerosol concentrator system has been developed that is designed for nominal operational conditions of a 2 μm AD cutpoint, an aerosol inflow to the first stage of 100 L/min ...