Supercritical water oxidation using hydrothermal flames at microscale as a potential solution for organic waste treatment in space applications – A practical demonstration and numerical study
Article dans une revue avec comité de lecture
Author
Date
2024-05Journal
Chemical Engineering JournalAbstract
Supercritical water oxidation (SCWO) with hydrothermal flames is well established for the treatment of aqueous organic waste as it not only overcomes the limitations of simple SCWO, such as precipitation of salts, but also exhibits many advantages over other waste treatment processes. Seeking these advantages, we propose to perform SCWO using hydrothermal flames in microfluidic reactors ) for aerospace applications to be used in deep space/ISS missions. The novelty and highlight of this work are successful demonstration of realizing microreactors (channel width 200 ), which can withstand pressure of 250 bar with temperature °C, thereby presenting the feasibility to realize this technology. We present the first evidence of SCWO/hydrothermal in a flow microreactor of sapphire, which is captured through optical visualization. This is followed by a numerical investigation to understand the underlying physics leading to the formation of hydrothermal flame and thus differentiate it from a simple SCWO reaction. The simulations are performed in a 2D domain in a co-flow configuration with equal inlet velocity of fuel and oxidizer at two different inlet temperatures (350 °C and 365 °C), just below the critical temperature of water using ethanol and oxygen, the former acting not only as a model organic matter but also fuel for the formation of hydrothermal flames. It is observed that due to microscale size of the system, hydrothermal flames are formed at low inlet velocities (< 30 mm/s), while reaction at higher ones are characterized as simple SCWO reaction. This upper limit of inlet velocity was found to increase with inlet temperature. Finally, some key characteristics of hydrothermal flames - ignition delay time, flame structure, shape, and local propagation speed are analyzed.
Files in this item
Related items
Showing items related by title, author, creator and subject.
-
Article dans une revue avec comité de lectureSHARMA, Deewakar; LECOUTRE, Carole; PALENCIA, Fabien; NGUYEN, Olivier; ERRIGUIBLE, Arnaud; MARRE, Samuel (Elsevier BV, 2023-11)With recent advancements in space technology, there is a need to develop technologies to ensure a sustainable environment for human survival. Among these, treatment of human and organic waste aboard manned space missions ...
-
Article dans une revue avec comité de lecturePURUSHOTTAM RAJ PUROHIT, Ravi Raj Purohit; FOWAN, Daniel Pepin; THUNE, Elsa; ARNAUD, Stephan; CHAHINE, Gilbert; BLANC, Nils; GUINEBRETIÈRE, René; CASTELNAU, Olivier (AIP Publishing LLC, 2022-10)Polycrystalline materials exhibit physical properties that are driven by both the interatomic crystallographic structure as well as the nature and density of structural defects. Crystallographic evolutions driven by phase ...
-
Article dans une revue avec comité de lectureGUINEBRETIÈRE, René; ORS, Taylan; MICHEL, Vincent; THUNE, Elsa; HUGER, Marc; ARNAUD, Stephan; BLANC, Nils; BOUDET, Nathalie; CASTELNAU, Olivier (American Physical Society, 2022)A deep understanding of the solid-state phase transition processes of zirconia is a mandatory requirement for the development of new zirconia-based materials useful for many industrial applications. For five decades, the ...
-
Article dans une revue avec comité de lectureGUINEBRETIÈRE, René; ARNAUD, Stephan; BLANC, Nils; BOUDET, Nathalie; THUNE, Elsa; BABONNEAU, David; CASTELNAU, Olivier (International Union of Crystallography, 2020)A furnace that covers the temperature range from room temperature up to 2000 K has been designed, built and implemented on the D2AM beamline at the ESRF. The QMAX furnace is devoted to the full exploration of the reciprocal ...
-
Chapitre d'ouvrage scientifiqueIn industry, the use of composites, and more specially carbon fiber/thermoset matrix ones, is ever increasing. However, end-of-life solutions for these materials are still under development. In this chapter, a solution ...