Application of the characteristics-based sectional method to spatially varying aerosol formation and transport
| Autor: | Markus Nordlund, Bernardus J. Geurts, Arkadiusz K. Kuczaj, E.M.A. Frederix, Arthur Veldman |
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| Přispěvatelé: | Computational and Numerical Mathematics, Center for Computational Energy Research |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Atmospheric Science
Environmental Engineering Condensation Flow (psychology) Isothermal flow Analytical chemistry Context (language use) 02 engineering and technology 01 natural sciences 010305 fluids & plasmas Complex geometry Materials Science(all) Multi-phase 0103 physical sciences Environmental Chemistry Droplet size distribution Aerosol Eulerian Fluid Flow and Transfer Processes Steady state Coagulation Chemistry Mechanical Engineering PISO Mechanics 021001 nanoscience & nanotechnology Pollution Characteristics Compressibility Nucleation Sectional EWI-27410 FLOW EQUATIONS 0210 nano-technology IR-103033 |
| Zdroj: | Journal of aerosol science, 104, 123-140. Elsevier Journal of Aerosol Science, 104, 123-140. ELSEVIER SCI LTD Journal of Aerosol Science, 104, 123-140. Elsevier |
| ISSN: | 0021-8502 |
| DOI: | 10.1016/j.jaerosci.2016.10.008 |
| Popis: | The characteristics-based ssolution. It is easy to verify thatectional method (CBSM) offers an Eulerian description of an internally mixed aerosol. It was shown to be robust and capable of exact preservation of lower order moments, allowing for highly skewed sectional droplet size distributions. In this paper we apply CBSM to a spatially varying flow, by incorporating the fractional step method. In this way an accurate time integration of the spatial terms in the transport equations for the velocity, mass fractions and sectional droplet concentrations is achieved. Integrating CBSM into the compressible PISO (Pressure-Implicit with Splitting of Operators) algorithm allows for phase change and corresponding changes in pressure. We apply CBSM to a lid-driven cavity flow. First, the steady state isothermal flow solution is validated against published data. Next, by releasing a saturated vapor into the cavity while cooling the walls, we simulate the formation of aerosol. The accuracy of the solution is studied, as well as the performance of the CBSM scheme in the spatially varying context. The solution of the velocity is shown to be accurate, even at CFL (Courant-Friedrichs-Lewy) numbers of unity. The feasibility of the developed method is demonstrated in a 3D complex geometry studying the aerosol generation via nucleation of hot vapors cooled by a dilution stream of cold air in a double-mixing tee system. The sectional approach delivers detailed information about the aerosol formation and size distribution of the droplets in the domain. |
| Databáze: | OpenAIRE |
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