Abstract
“Salt ngering”, the phenomenon of the double-di$usive convection has been studied experimentally.
We prepareda system with vertical density variation, which contains salt andsugar
solutions, separatedone from the other. The “salt ngers” appear at the interface between these
layers of salt andsugar solutions. The “salt ngers” have been observedby means of shadowgraph
technique.
With the aidof a computer andthe video-capture technique, it was possible for the rst time
to conduct a detailed investigation of the phenomenon. The geometric characteristics of the “salt
ngers” such as form, length and width have been investigated.
The way in which these quantities dependon the salinity andsugar concentrations, as well as
the thickness of the salt andsugar layers has been veriedexperimentally. We also veriedthe
predicted form of dependence of the average “salt ngers” width on its vertical length. c 2002
Elsevier Science B.V. All rights reserved.
PACS: 44.25; 47.20; 66.10.7
Keywords: Double-di$usive convection; Hydrodynamic instability; “Salt ngers”
Abstract
“Salt ngering”, the phenomenon of the double-di$usive convection has been studied experimentally.
We prepareda system with vertical density variation, which contains salt andsugar
solutions, separatedone from the other. The “salt ngers” appear at the interface between these
layers of salt andsugar solutions. The “salt ngers” have been observedby means of shadowgraph
technique.
With the aidof a computer andthe video-capture technique, it was possible for the rst time
to conduct a detailed investigation of the phenomenon. The geometric characteristics of the “salt
ngers” such as form, length and width have been investigated.
The way in which these quantities dependon the salinity andsugar concentrations, as well as
the thickness of the salt andsugar layers has been veriedexperimentally. We also veriedthe
predicted form of dependence of the average “salt ngers” width on its vertical length. c 2002
Elsevier Science B.V. All rights reserved.
PACS: 44.25; 47.20; 66.10.7
Keywords: Double-di$usive convection; Hydrodynamic instability; “Salt ngers”
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