On the Consideration of Diffusive Fluxes Within High-Pressure Injections
| Autor: | Fabian Föll, Grazia Lamanna, Valerie Gerber, Berhand Weigand, Claus-Dieter Munz |
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| Rok vydání: | 2020 |
| Předmět: |
Physics
020301 aerospace & aeronautics Work (thermodynamics) 02 engineering and technology Mechanics 01 natural sciences Supercritical fluid 010305 fluids & plasmas symbols.namesake Fourier transform 0203 mechanical engineering Speed of sound 0103 physical sciences Thermal symbols Diffusion (business) Adiabatic process Mixing (physics) |
| Zdroj: | Notes on Numerical Fluid Mechanics and Multidisciplinary Design ISBN: 9783030538460 |
| DOI: | 10.1007/978-3-030-53847-7_12 |
| Popis: | Mixing characteristics of supercritical injection studies were analyzed with regard to the necessity to include diffusive fluxes. Therefore, speed of sound data from mixing jets were investigated using an adiabatic mixing model and compared to an analytic solution. In this work, we show that the generalized application of the adiabatic mixing model may become inappropriate for subsonic submerged jets at high-pressure conditions. Two cases are discussed where thermal and concentration driven fluxes are seen to have significant influence. To which extent the adiabatic mixing model is valid depends on the relative importance of local diffusive fluxes, namely Fourier, Fick and Dufour diffusion. This is inter alia influenced by different time and length scales. The experimental data from a high-pressure n-hexane/nitrogen jet injection were investigated numerically. Finally, based on recent numerical findings, the plausibility of different thermodynamic mixing models for binary mixtures under high pressure conditions is analyzed. |
| Databáze: | OpenAIRE |
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