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PCH. Physicochemical hydrodynamics
Harel, Z., Tel Aviv Univ, Israel
Tanny, J., Tel Aviv Univ, Israel
Tsinober, A., Tel Aviv Univ, Israel
Double diffusive phenomena are essentially convective processes arising as a consequence of difference in molecular diffusivity of (at least) two constituents (heat, salt). The presence of opposing gradients of two buoyancy components with different molecular diffusivities in a statically stable stratified fluid may give rise to-double diffusive convection resulting, for example, in splitting of the initial smooth gradient into a system of convective layers. The objective of this experimental study is aimed firstly to look for the mechanisms by which the two gradients (temperature and concentration) are built up. Secondly, it is aimed at obtaining experimentally the gradients within the system at equilibrium conditions and comparing the concentration gradient with the one predicted by the theoretical considerations below. The experimental results are in good agreement with the results obtained by the theoretical considerations when applying the fact that in equilibrium conditions μ = constant within the stratified system, thus grad μ is equal to zero. The new approach which was used in analysing double diffusive phenomena at concentration close to saturation on the basis of the chemical potential of the solution may replace the previously used concept of counter action of upward diffusion and precipitation of crystalized salt in supersaturated solution. This approach may assist in prediction of the density gradient corresponding to a temperature gradient in a stratified system close to saturation at equilibrium conditions.
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Double diffusive phenomena in a stratified fluid close to saturation
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Harel, Z., Tel Aviv Univ, Israel
Tanny, J., Tel Aviv Univ, Israel
Tsinober, A., Tel Aviv Univ, Israel
Double diffusive phenomena in a stratified fluid close to saturation
Double diffusive phenomena are essentially convective processes arising as a consequence of difference in molecular diffusivity of (at least) two constituents (heat, salt). The presence of opposing gradients of two buoyancy components with different molecular diffusivities in a statically stable stratified fluid may give rise to-double diffusive convection resulting, for example, in splitting of the initial smooth gradient into a system of convective layers. The objective of this experimental study is aimed firstly to look for the mechanisms by which the two gradients (temperature and concentration) are built up. Secondly, it is aimed at obtaining experimentally the gradients within the system at equilibrium conditions and comparing the concentration gradient with the one predicted by the theoretical considerations below. The experimental results are in good agreement with the results obtained by the theoretical considerations when applying the fact that in equilibrium conditions μ = constant within the stratified system, thus grad μ is equal to zero. The new approach which was used in analysing double diffusive phenomena at concentration close to saturation on the basis of the chemical potential of the solution may replace the previously used concept of counter action of upward diffusion and precipitation of crystalized salt in supersaturated solution. This approach may assist in prediction of the density gradient corresponding to a temperature gradient in a stratified system close to saturation at equilibrium conditions.
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