Buoyant mixing of two fluids in tubes is studied experimentally as a function of the tilt angle from vertical, the density contrast and the common viscosity . At high contrasts and low , longitudinal mixing is macroscopically diffusive, with a diffusivity increasing strongly with and . At lower contrasts and higher , a counterflow of the two fluids with little transverse mixing sets in. The transition occurs at an angle increasing with density contrast and decreasing with . These results are discussed in terms of the dependence of transerse mixing on and an analogy with the Boycott effect.
Skip Nav Destination
Letter| October 21 2004
Buoyant mixing of miscible fluids in tilted tubes
T. Séon, J.-P. Hulin, D. Salin, B. Perrin, E. J. Hinch; Buoyant mixing of miscible fluids in tilted tubes. Physics of Fluids 1 December 2004; 16 (12): L103–L106. https://doi.org/10.1063/1.1808771
Download citation file: