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Your search keyword '"Tatschl R."' showing total 16 results
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16 results on '"Tatschl R."'

4. Simulation of Primary Break-up of Diesel Jets by a Hybrid Method Combining VOF-Calculations and the Classical DDM Rate Approach with a 3D CFD Co

Author

Suzzi D., v. Berg E., Pastor J. V., Tatschl R., BIANCHI, GIAN MARCO, ILASS, Suzzi D., v. Berg E., Pastor J.V., Bianchi G.M., and and Tatschl R.

Abstract

A novel hybrid primary break-up model, which is based on coupling of direct numerical simulation (DNS), energy conservation method and linear stability analysis has been implemented into a 3D CFD code and has been tested under conditions typical for Diesel fuel injection in IC engines. Droplet spectra have been pre-calculated for the relevant range of injection and have been stored in a database. From this database actual values in the 3D code are gained during injection time using a quadrilinear interpolation technique to save computational effort. The results are compared with various experiments for non-evaporating and evaporating sprays with promising results.

Published
2004

15. Numerical simulation of fluid flow in a smelting cyclone reactor.

Author

Lackner A., Pyrometallurgy '95 Cambridge, England 10-Jul-9512-Jul-95, Pachler K., Paschen P., Tatschl R., Lackner A., Pyrometallurgy '95 Cambridge, England 10-Jul-9512-Jul-95, Pachler K., Paschen P., and Tatschl R.

Abstract

Conditions in the reactor were modelled using the Computational Fluid Dynamics software FIRE. The results of one-phase flow calculation showed the advantages of top concentrate feeding, large height/width ratio of the tuyeres and an increased number of tangential inlets. Two-phase flow calculations simulated by non-reacting concentrate particles with different particle mean diameters proved the great advantages of top blowing; the result is a much better particle distribution and an enhanced retention time inside the reactor before the particles reach the cyclone wall. The next step in modelling will be to include the chemical reaction and heat balance in order to simulate both flow and converting reactions., Conditions in the reactor were modelled using the Computational Fluid Dynamics software FIRE. The results of one-phase flow calculation showed the advantages of top concentrate feeding, large height/width ratio of the tuyeres and an increased number of tangential inlets. Two-phase flow calculations simulated by non-reacting concentrate particles with different particle mean diameters proved the great advantages of top blowing; the result is a much better particle distribution and an enhanced retention time inside the reactor before the particles reach the cyclone wall. The next step in modelling will be to include the chemical reaction and heat balance in order to simulate both flow and converting reactions.

Published
1995

16. Reducing CO2 emissions in cement industry-the calcination model

Author

Hrvoje Mikulčić, Minić, I., Berg, E. V., Fidaros, D. K., Vujanović, M., Priesching, P., Tatschl, R., Duić, N., and Stefanović, G.

Subjects
Calcination process, Cement calciner, CFD, Cement production, Fuel efficiency
Abstract

The cement industry is one of the leading producers of the greenhouse gases, where carbon dioxide is the most significant anthropogenic greenhouse gas. There are two thermo-chemical processes involved in cement production which contribute to these emissions. One is the thermal decomposition of limestone, widely known as the calcination process, and the other is the combustion of fossil fuels. Recently, researchers have invested significant effort to improve the energy consumption and pollutant formation of the overall cement manufacturing process. One of these improvements was made by dividing the calcination and clinkering process into two separate furnaces, where the calcination process is performed in a furnace called a calciner, and the clinkering process is performed in a rotary kiln. Because this is a new technology in the cement manufacturing process, cement calciners are still in the research and development phase. The purpose of this paper is to present the first phase of the cement calciner's development, which is the CFD simulation of the cement calciner, with an implemented mathematical model of the calcination process. From the results gained by these simulations, researchers will have an in-depth understanding of all thermo-chemical reactions in a cement calciner. This understanding can be used for the optimization of the calciner's geometry, to have a more efficient production, to lower the pollutant formation and subsequently reduce greenhouse gases emission.

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