Accurate fluxes across a salt-sugar finger interface deduced from direct density measurements
- 11 July 1980
- journal article
- research article
- Published by Cambridge University Press (CUP) in Journal of Fluid Mechanics
- Vol. 99 (1) , 85-95
- https://doi.org/10.1017/s0022112080000511
Abstract
The buoyancy flux ratio, r = αFT/βFS, across a salt-sugar fingering interface is determined from accurate measurements of the density variations in a two-layer run-down experiment. Since r is close to 1, the net buoyancy flux, βFS − αFT, which is proportional to 1 − r, gives r with a resolution that is much improved over that of previous measurements. The value of r is found to decrease from r ≈ 0·94 ± 0·01 at Rρ = 1·02 to r = 0·88 ± 0·01 at Rρ = 2, where Rρ is the density anomaly ratio. The latter is smaller than the previous (constant) value of 0·92. The buoyancy flux due to sugar is found to decrease rapidly with increasing Rρ, varying approximately as R−6ρ.Keywords
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