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BP: Fachverband Biologische Physik

BP 10: Posters DY - Fluid Physics, Active Matter, Complex Fluids, Soft Matter and Glasses (joint session DY/BP)

BP 10.21: Poster

Monday, March 22, 2021, 14:00–16:30, DYp

The parameter space of thermohaline stairs — •Axel Rosenthal and Andreas Tilgner — Institut für Geophysik, Georg-August-Universität Göttingen, Deutschland

Convection and diffusion in water can be observed when a gradient in temperature or in salinity takes effect on density in presence of gravity. Both gradients can force or stabilize the process. We conducted experiments where the salt gradient is the driving force and simultaneously the temperature gradient is stabilizing in opposite direction, observed by particle image velocimetry. The question is at which gradients, expressed by Rayleigh numbers, does the transport occure in stable so called "thermohaline stairs"? Thermohaline stairs are a sequence of two flow systems, a finger regime and a large scale circulation.