Gravitational instabilities in free diffusion boundaries

Vitagliano, Pier Luigi; Volpe, C. Della; Vitagliano, Vincenzo

doi:10.1007/bf00647223

Cited by 29 publications

(11 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Experimental values of the (D ij ) V and H i coefficients of eq 2 were used to test the static and dynamic stabilities of all our ternary solution diffusion boundaries (Miller and Vitagliano, 1986;Vitagliano et al, 1984Vitagliano et al, , 1986. Calculations and experiments indicate all boundaries were stable.…”

Section: Calculations For Ternary Solutionsmentioning

confidence: 99%

Ternary Solution Mutual Diffusion Coefficients and Densities of Aqueous Mixtures of NaCl and Na₂SO₄ at 298.15 K for Six Different Solute Fractions at a Total Molarity of 1.000 mol·dm^-³

and¹,

Gillespie²,

and³

et al. 1998

J. Chem. Eng. Data

View full text Add to dashboard Cite

Isothermal mutual diffusion coefficients (interdiffusion coefficients) were measured for ternary aqueous mixtures of NaCl and Na2SO4 at a constant total molarity of 1.000 mol·dm-3 and 298.15 K. Measurements were performed using Rayleigh interferometry with computerized data acquisition at NaCl molarity fractions of z 1 = 1, 0.90, 0.75, 0.50, 0.25, and 0. Densities of the solutions were measured with a vibrating tube densimeter. At all ternary solution compositions, one cross-term diffusion coefficient has negative values whereas the other has positive values. These measurements supplement our earlier results at 0.500 mol·dm-3. Both main-term diffusion coefficients are significantly smaller at 1.000 mol·dm-3 than at 0.500 mol·dm-3 at any fixed value of z 1, whereas both cross-term coefficients are shifted in a positive direction. Trace diffusion coefficients D*(Cl-) and D*(S ) were extrapolated from these results for the Cl-(aq) ion in 1.0 mol·dm-3 Na2SO4(aq) and for the S (aq) ion in 1.0 mol·dm-3 NaCl(aq). Values of D*(Cl-) in Na2SO4(aq) and in NaCl(aq) were found to be essentially identical, as were D*(S ) in these same two electrolytes, provided the comparisons were made at the same volumetric ionic strengths.

show abstract

Section: Calculations For Ternary Solutionsmentioning

confidence: 99%

Ternary Solution Mutual Diffusion Coefficients and Densities of Aqueous Mixtures of NaCl and Na₂SO₄ at 298.15 K for Six Different Solute Fractions at a Total Molarity of 1.000 mol·dm^-³

and¹,

Gillespie²,

and³

et al. 1998

J. Chem. Eng. Data

View full text Add to dashboard Cite

show abstract

“…Values of J m , D a , and Q o for all the experiments are given in Table . From these data and the concentration differences from the top and bottom solutions, Δ C i , a preliminary set of D ij values were obtained by using the RFG program. , All the runs used to compute the diffusion coefficients were controlled to be in the range of gravitational stability . Diffusion measurements were performed at five mean compositions (see Figure ); comprehensive results are given in Table .…”

Section: Methodsmentioning

confidence: 99%

Mutual Diffusion Measurements in a Ternary System: Ionic Surfactant−Nonionic Surfactant−Water at 25 °C

et al. 1998

View full text Add to dashboard Cite

The four diffusion coeffs. describing the isothermal transport process in ternary systems have been measured in aq. solns. of mixed surfactants. Measurements have been made on the system pentaethylene glycol 1-hexyl ether-sodium 1-hexanesulfonate-water at various mean compns. The anal. of diffusion data allows a reasonable interpretation of the behavior of mixed surfactant solns., showing the evidence of the presence of mixed micelles

show abstract

“…The stability analysis of diffusion boundaries was widely discussed in the literature [Veronis, 1965;Baines and Gill, 1969;Sartory, 1969;Turner, 1973;Huppert and Manins, 1973], including the particular case of isothermal multi-component boundaries [McDoughall, 1983;Vitagliano, et al, 1984Ambrosone, et al, 1993] and various experimental cases were examined [Vitagliano, et al, 1972[Vitagliano, et al, , 1984[Vitagliano, et al, ,1988.…”

Section: Gravitational Instabilitiesmentioning

confidence: 99%

Diffusion and Double Diffusive Convection in Isothermal Liquid Boundaries

Vitagliano

2013

Geophysical Monograph Series

Self Cite

View full text Add to dashboard Cite

Gravitational instabilities in multicomponent liquid diffusion boundaries are briefly discussed. Two types of convective motions have been found in a diffusion boundary: (1) Dynamic instability arises at the center of the boundary and develops with a finger-like mechanism.(2) Diffusional instability arises at the borders of the boundary promoting a layering of the boundary that keeps itself apparently stable and sharp for long time. The experimental techniques that allow to detect quite accurately the conditions for onset of convection are briefly illustrated.

show abstract

Gravitational instabilities in free diffusion boundaries

Cited by 29 publications

References 13 publications

Ternary Solution Mutual Diffusion Coefficients and Densities of Aqueous Mixtures of NaCl and Na₂SO₄ at 298.15 K for Six Different Solute Fractions at a Total Molarity of 1.000 mol·dm^-³

Ternary Solution Mutual Diffusion Coefficients and Densities of Aqueous Mixtures of NaCl and Na₂SO₄ at 298.15 K for Six Different Solute Fractions at a Total Molarity of 1.000 mol·dm^-³

Mutual Diffusion Measurements in a Ternary System: Ionic Surfactant−Nonionic Surfactant−Water at 25 °C

Diffusion and Double Diffusive Convection in Isothermal Liquid Boundaries

Contact Info

Product

Resources

About

Gravitational instabilities in free diffusion boundaries

Cited by 29 publications

References 13 publications

Ternary Solution Mutual Diffusion Coefficients and Densities of Aqueous Mixtures of NaCl and Na2SO4 at 298.15 K for Six Different Solute Fractions at a Total Molarity of 1.000 mol·dm-3

Ternary Solution Mutual Diffusion Coefficients and Densities of Aqueous Mixtures of NaCl and Na2SO4 at 298.15 K for Six Different Solute Fractions at a Total Molarity of 1.000 mol·dm-3

Mutual Diffusion Measurements in a Ternary System: Ionic Surfactant−Nonionic Surfactant−Water at 25 °C

Diffusion and Double Diffusive Convection in Isothermal Liquid Boundaries

Contact Info

Product

Resources

About

Ternary Solution Mutual Diffusion Coefficients and Densities of Aqueous Mixtures of NaCl and Na₂SO₄ at 298.15 K for Six Different Solute Fractions at a Total Molarity of 1.000 mol·dm^-³

Ternary Solution Mutual Diffusion Coefficients and Densities of Aqueous Mixtures of NaCl and Na₂SO₄ at 298.15 K for Six Different Solute Fractions at a Total Molarity of 1.000 mol·dm^-³