Improved Capillary Method for Diffusivity Measurements

Luk, C. Y.; Nanis, L.; Litt, Mitchell

doi:10.1021/i160054a004

Cited by 10 publications

(5 citation statements)

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“…[1] with Eq. [2] and [3] as boundary conditions can be accomplished by the method of separation of variables and also by Laplace transform techniques. Each method yields a series solution for which the first term is entirely adequate over a wide range of residual concentration.…”

Section: Resultsmentioning

confidence: 99%

“…The capillary method was selected for the experiment because of its simplicity for measurement of both the integral and differential salt diffusivity and was determined on the basis of zinc ion concentration changes. The capillary method has been described in detail (2)(3)(4) and is reviewed here only briefly.…”

Section: Methodsmentioning

confidence: 99%

“…[1] with the boundary conditions of zero flux at the closed end of the capillary, Eq. [2], and zero concentration at the open mouth (x = L) of the capillary, given by Eq. [3].…”

Section: Methodsmentioning

confidence: 99%

“…However, the average capillary concentration was fitted to the mathematical results for stirring, obtained from the solution to Eq. [1], [2], and [3]. The convective flow induced by density gradients at the capillary mouth and by thermal gradients ir/the external volume were considered sufficient to meet the requirements of Eq.…”

Section: Methodsmentioning

confidence: 99%

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Diffusivity in Zinc Chloride‐Potassium Chloride Electrolyte

Loftus

Roberts

Weaver

et al. 1983

J. Electrochem. Soc.

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Integral and differential salt diffusivities have been measured by the capillary method for electrolytes of interest to mass transfer of zinc in the zinc‐chlorine hydrate battery. No dependence of diffusivity on the concentration of ZnCl2 was found over the range 0.4–1.6MZnCl2 in 3.5MnormalKCl . The average diffusivity was 0.88×10−5 cm2 sec−1 at 26.5°C and 1.49×10−5 cm2 sec−1 at 47.5°C.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…[1] with the boundary conditions of zero flux at the closed end of the capillary, Eq. [2], and zero concentration at the open mouth (x = L) of the capillary, given by Eq. [3].…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Diffusivity in Zinc Chloride‐Potassium Chloride Electrolyte

Loftus

Roberts

Weaver

et al. 1983

J. Electrochem. Soc.

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“…The majority of the cited authors claim that the experimental error of the methods of this class is about 2-3%. The affirmation of Turner and Chong, "If there is either no flow or steady flow then this becomes... measurements in this system are difficult, uncertain and tedious" seems to be fair with respect to the authors of the works on the improved version of measurements of diffusivities in a stagnant liquid column in a capillary (Luk et al,, 1975;Gosman and Tuchlor, 1981). It is necessary to say that even in these cases the results obtained were more accurate.…”

mentioning

confidence: 99%

Comments on "Determination of diffusion coefficients by frequency response in Taylor flow"

Hančil¹,

Vacek²

1983

Ind. Eng. Chem. Fund.

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In our original paper the subscript i was lost in eq 3, and consequently we used the rate expression given below (4) Clearly, the effect of dropping the subscript i in eq 3 is to use the current polymer concentration, instead of the initial polymer concentration, as the driving force for the reverse reaction, and, since C, < Cpi, our earlier analysis should have predicted values for the polymer concentration and degree of polymerization that are too large. Warner (1981) had, in fact, pointed out to us some time ago the incorrectness of eq 4 and on the basis of his comments we then computed solutions to the revised equations. Indeed, our revised computations yielded values for the degree of polymerization at the exit of the reactor which were smaller than the ones we reported earlier. However, i n all cases the qualitative trends were found t o be identical. r(C,C,) = kC,2 -(k/K)C,CWe are unable to comment on the quantitative result for the degree of polymerization at the reactor exit, E, , = 52.7, given by Gupta et al., since the Gupta model incorporates an additional dimensionless parameter and is philosophically different from our model. The Gupta model takes the wiped film to be of finite thickness, whereas our model considers the film thickness to be infinite in relation to the penetration depth for mass transfer. Literature Cited

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Self‐Diffusion in Benzene‐Toluene and Benzene‐Cyclohexane Solutions

Reimschüssel

Hawlicka

1977

Ber Bunsenges Phys Chem

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The self‐diffusion in benzene‐toluene and benzene‐cyclohexane solutions have been measured at different temperatures. The capillary‐cell method was employed. The activation parameters of self‐diffusion for the systems are presented. The data have been used to test the validity of various diffusion equations proposed in the literature. The hypothesis that the self‐diffusion was realized by movement of aggregates of molecules is suggested.

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Improved Capillary Method for Diffusivity Measurements

Cited by 10 publications

References 5 publications

Diffusivity in Zinc Chloride‐Potassium Chloride Electrolyte

Diffusivity in Zinc Chloride‐Potassium Chloride Electrolyte

Comments on "Determination of diffusion coefficients by frequency response in Taylor flow"

Self‐Diffusion in Benzene‐Toluene and Benzene‐Cyclohexane Solutions

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