climate changes and global warming are considered as very important challenges of sustainable development. carbon sequestration is the easiest and cheapest way to reduce the greenhouse gases, especially carbon which constitutes the largest portion of them. in the present study, the potential of carbon sequestration in four plant species of atriplex canescens, haloxylon persicum, artemisia siebe...

The tandem differential mobility analyzer (TDMA) technique was applied to determine the hygroscopicity and volatility of atmospheric ultrafine particles in three sites of urban Gwangju, industrial Yeosu, and coastal Taean in South Korea. A database for the hygroscopicity and volatility of the known compositions and sizes of the laboratory-generated particles wasfirst constructed for comparison ...

nanocrystalline complex oxides have been synthesized by combination of sol–gel auto combustion and ultrasonic irradiation techniques using copper nitrate, zinc nitrate as metallic nitrates and glycine, urea and thiourea as fuels. sol-gel combustion (combination of the chemical sol–gel process and the combustion process) as a proper synthesized technique is used to synthesize zno/cuo nanocomposi...

The paper describes correlation between combustion knock intensity and combustion rate calculated as the heat release rate from combustion pressure traces of a hydrogen fuelled spark ignited engine. Unlike a gasoline spark ignited (SI) engine, the hydrogen fuelled engine can easily generate knock during combustion at working conditions similar to a gasoline engine. However, the hydrogen knock d...

Filtered value of the combustion source term in large eddy simulation (LES) can be accurately estimated using the joint probability density function (PDF) of species mass fraction and enthalpy. Computing the PDF using traditional stochastic methods in shock-containing flows however leads to numerical instabilities. Recently an accurate quadrature based method called semi-discrete quadrature met...

Skeletal reaction models for n-butane and iso-butane combustion are derived from the detailed gas phase chemistry model of USC Mech II through directed relation graph (DRG) and DRG aided sensitivity analysis (DRGASA) methods. The skeletal models generated from various combustion systems, e.g. auto-ignitions versus premixed flames, n-butane versus i-butane, are compared, and analyzed based on th...

This paper presents numerical methods for the simulation of combustion processes in porous media. The equations governing the ow in the porous medium are discretized by the mixed nite element method on Raviart{Thomas elements of lowest order. Hybridization is applied to transform the resulting equations into a form more convenient for the solution by multigrid methods. Special emphasis is put o...

In the analysis of combustion processes, simulation is a costefficient tool that complements experimental testing. The simulation models must be precise if subtle differences are to be detected. On the other hand, computational evaluation of precise models typically requires substantial effort. To escape the computational bottleneck, reduced chemical schemes, for example, ILDM-based methods or ...

Title of Dissertation: EVALUATING SURFACE MECHANISMS FOR CATALYTIC COMBUSTION OF H2 AND CH4 ON Pd CATALYSTS Seyed-Abdolreza Seyed-Reihani, Doctor of Philosophy, 2005 Dissertation directed by: Associate Professor Gregory Jackson Department of Mechanical Engineering Applications of fuel-lean catalytic combustion for power generation and exhaust heat recovery have raised the desire for reactor opt...