Finger properties in bounded double diffusive finger convection

Rosenthal, Axel und Tilgner, Andreas (14. Februar 2025): Finger properties in bounded double diffusive finger convection. In: Physics of Fluids, Bd. 37, Nr. 2, 027157

Abstract

We analyze experimental data on double diffusive convection in an electrochemical cell in the finger regime. All fingers in the experiments are bounded on at least one end by a solid wall. The properties of these fingers are compared with those of fingers in other experiments which are surrounded by fluid on all sides. The compositional boundary layers are found to be thinner than the finger width. The finger thickness agrees well with half the wavelength of the fastest growing mode obtained in linear stability analysis. The ion transport through the boundary layers is reduced by two orders of magnitude compared with unbounded fingers. The overturning layers in staircases contribute negligibly to salinity mixing because of efficient transport between finger layers and convection rolls.

• Dokumententyp: Zeitschriftenartikel
• Keywords: Linear stability analysis; Heat transfer; Laboratory procedures; Electrochemistry; Electrolytes; Fluid mechanics; Fluid dynamics; Natural convection; Flow visualization
• Fakultät: Geowissenschaften > Department für Geo- und Umweltwissenschaften > Projekte > SPP 2404 DeepDyn
• Themengebiete: 500 Naturwissenschaften und Mathematik > 530 Physik ; 500 Naturwissenschaften und Mathematik > 550 Geowissenschaften, Geologie
• ISSN: 1070-6631
• Sprache: Englisch
• DFG: Gefördert durch die Deutsche Forschungsgemeinschaft (DFG) - 500707704
• DFG: Gefördert durch die Deutsche Forschungsgemeinschaft (DFG) - 520957279