Fluid injection with supercritical reservoir conditions: Overview on morphology and mixing
| Autor: | Grazia Lamanna, Steffen Baab, Felix J. Förster, Bernhard Weigand, Valerie Gerber, Hannes Mandler |
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| Rok vydání: | 2021 |
| Předmět: |
Phase transition
Work (thermodynamics) Materials science Turbulence General Chemical Engineering Nozzle 02 engineering and technology Mechanics Condensed Matter Physics 01 natural sciences Supercritical fluid 010305 fluids & plasmas Physics::Fluid Dynamics Superheating 020401 chemical engineering 0103 physical sciences 0204 chemical engineering Physical and Theoretical Chemistry Adiabatic process Mixing (physics) |
| Zdroj: | The Journal of Supercritical Fluids. 169:105097 |
| ISSN: | 0896-8446 |
| DOI: | 10.1016/j.supflu.2020.105097 |
| Popis: | The present work provides an overview on the possible phase transitions associated with supercritical fluid injection and a detailed evaluation of the mixing process between injectant fluid and quiescent ambience. The experiments cover superheated liquid disintegration, pseudo-boiling transition and single-phase jets under different nozzle pressure ratios. Pseudo-boiling effects emerge when rapid, subsequent changes in pressure/temperature interact with the non-linear behavior of thermodynamic response functions across the Widom line. The associated density fluctuations cause a significant increase in the scattering cross section and may lead to thermo-convective instabilities. Our analysis of the mixing process demonstrates the limited applicability of the adiabatic mixing model, which is often restricted to short residence times even in highly turbulent jets ( Re = O ( 10 5 ) ). Specifically, our findings show the importance of considering all coupled transport processes in the analysis of mixing problems at high pressures, in particular in presence of large mass concentration and temperature gradients. |
| Databáze: | OpenAIRE |
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