Publications Repository - Helmholtz-Zentrum Dresden-Rossendorf

We performed an experimental and numerical investigation of a convective buoyancy-driven instability that arises during the injection of a denser miscible fluid into a less dense one in a rectilinear geometry. We visualized the instability using a shadowgraph technique and we obtained quantitative information using micro-Paricle Image Velocimetry. Numerical simulations provided further insights into the 3D velocity field. We suggest scalings of the critical time, TC and dimensionless wavelength, λ/h of the instability by using the Péclet and Rayleigh numbers. Finally, we investigated the interactions of the instability vortices with each other and the geometry boundaries.