| Zugriffsnummer | 36662 |
| Dokumenttyp | Konferenzartikel |
| Peer Review | unbekannt |
| Sprache | Englisch |
| Titel | Numerical simulation of the gas mixing behavior in a soot conditioning system |
| Autor(in); Institution |
Lindner, Gert; 8.4, Mathematische Modellierung und Datenanalyse, PTB-Berlin
Nowak, Andreas; 3.2, Gasanalytik und Zustandsverhalten, PTB-Braunschweig
Schmelter, Sonja; 8.4, Mathematische Modellierung und Datenanalyse, PTB-Berlin
|
| Quelle/Jahr | 17th International Flow Measurement Conference, FLOMEKO 2016:(2016), 1 - 6 |
| URL | |
| Konferenzangaben | 17th International Flow Measurement Conference (FLOMEKO), Sydney, 26-29, September, 2016, Australia |
| Freie Schlagworte | CFD ; gas mixing ; soot conditioning system ; turbulence modelling ; turbulent Schmidt number ; PTB high performance compute cluster |
| Zusammenfassung | In order to establish a primary soot aerosol standard for the calibration of aerosol instrumentation, a high-accuracy soo generator as well as a well-defined aerosol conditioning, dilution, and homogenization unit is needed. In this contribution, the mixing behavior of different gases under different junction conditions was numerically investigated to gain insight for favorable setup geometries and flow conditions of soot measuring systems. The overall goal was to find the design that leads to the fastest mixing of the different incoming gas components for a given pipe length. For this purpose, a main pipe with two symmetrically arranged side inlet pipes was considered, where the angle of inclination of the side pipes as well as the inflow conditions were varied. It was found that, in general, the required pipe length to reach a sufficiently homogeneous gas mixture decreases with increasing inclination angles exhibiting the best performance at obtuse angles. Furthermore, it has been observed that the turbulent Schmidt number used in the turbulence modeling of the transport equation of the mass fraction of aerosol-laden gas has an important influence on the speed of mixing. In general one can say that, the smaller the turbulent Schmidt number, the faster the mixing. Nevertheless, it can also be observed that the qualitative behavior how the mixing length in- or decreases with changes in the geometry is invariant under different turbulent Schmidt numbers. |
