Effect of meteorology and transport on particle concentrations and size distribution in Eastern Mediterranean atmosphere

Uzunpınar, Elif Sena
This study aims to examine the relationship between particle sizes and processes in the atmosphere and the effect of dust transport on particle size distribution. Number (0.2 μm to 32 μm) and mass (PM1, PM2.5, and PM10) concentrations were collected at rural (Mediterranean coast - Marmaris) and suburban (Central Anatolia - Ankara) stations between April 1, 2017, and October 31, 2018. The coarse particles were more dominant in the Ankara while the Marmaris contained relatively smaller-sized particles. The local source contribution was dominant at the suburban station and the effect of transported particles on the concentrations was masked. The effect of Eastern dust was observed at the suburban station. The seasonality shift in the Saharan dust episodes was observed as they occurred dominantly in winter. The rain events were only effective above PM2.5, showing that they did not lower the effect of PM on human health. PMF analysis of rural station revealed five factors: sea salt, crustal, local anthropogenic, oil combustion, and regional combustion. Coarse particles were dominated by lithophile and chalcophile elements. Secondary inorganic ions, crustal material, and sea salt formed approximately 75% of PM10 mass. North African dust accounted for 55% - 76% of concentrations of lithophile elements, but only 26% of PM10 mass, due to sea salt and secondary ion contribution.


Effect of turbulence modeling for the prediction of flow and heat transfer in rotorcraft avionics bay
Akin, Altug; Kahveci, Harika Senem (Elsevier BV, 2019-12-01)
In this paper, four turbulence models are compared on the basis of the predictions they produce for the flow and heat transfer in the avionics bay area of a rotorcraft. The turbulence models studied are the standard k-s, Renormalization Group (RNG) k-epsilon, realizable k-epsilon, and Shear-Stress Transport (SST) k-omega model. The avionics bay used in the study houses avionics equipment mounted on the floor and on a rack inside the bay to mimic a realistic distribution of equipment in actual rotorcraft. Th...
Effect of particle size on coal pyrolysis
Kök, Mustafa Verşan; Karacan, Ozgen; Hicyilmaz, Cahit (1998-01-01)
This research comprises the effect of particle size on coal pyrolysis by thermogravimetry (TG/DTG). All the experiments were conducted at non-isothermal heating conditions with a heating rate of 10 degrees C min(-1). in the temperature range of 20-600 degrees C, under nitrogen atmosphere. Different fractions of Cayirhan coal coal showed differences in TG/DTG curves, peak temperatures and residue values. The Arrhenius model is applied to determine the kinetic parameters from TG/DTG curves.
Effect of shape on incipient motion of large solitary particles
Göğüş, Mustafa (2005-01-01)
The aim of this study is to investigate the effect of shape and size of solid particles on their initiation of motion in open channel flows. Initial motions of 22 solitary particles having different shapes and sizes were observed in a tilting flume of rectangular cross section. A smooth fixed bed and an obstructing element of smaller height with respect to the particle size was used throughout the experiments. The ratio of the height of the obstructing element to the height of the particle was kept constant...
Effect of particle size and heating rate on the combustion of Silopi asphaltite
Altun, Naci Emre; Kök, Mustafa Verşan (2002-05-01)
In this study, the effects of particle size and heating rate on the combustion properties of Silopi asphaltite were investigated. Nonisothermal thermogravimetry experiments were carried out at three different size fractions and five different heating rates. The TG/DTG experiments were carried out from ambient to 900 degreesC in air. The data obtained were analyzed for the determination of the combustion characteristics of the sample. Also an Arrhenius type kinetic model complemented with the weighed mean ac...
Effect of temperature on heavy oil/water relative permeabilities
Akın, Serhat; Brigham, William E. (1999-01-01)
In the first part of this study, the accuracy of the JBN technique for the determination of heavy oil/water relative permeabilities, and the effect of temperature on relative permeabilities is examined by giving numerical as well as experimental examples. Using the JBN technique leads to a false temperature dependence of relative permeability curves. In the second part, we present unsteady state relative permeability experiments with initial brine saturation at differing temperatures conducted using South B...
Citation Formats
E. S. Uzunpınar, “Effect of meteorology and transport on particle concentrations and size distribution in Eastern Mediterranean atmosphere,” Ph.D. - Doctoral Program, Middle East Technical University, 2022.