摘要:

A coordination number model for single component square-well fluids is generalised here to apply to binary square-well fluids using a one-fluid mean field approach. Based on Monte Carlo computer simulations of this work and of others we test this new predictive model for the species-resolved coordination numbers of square-well binary mixtures. The model is found to be valid for unequal values for the core diameter, interaction range and well-depth in the relative range ∼ × 2 for the two components. The predictions of the new model as a function of composition, density and temperature are in exceptional agreement with the Monte Carlo computer simulation results.

ISSN:0031-9104    

DOI:10.1080/00319109208027272

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

A 'jump' model of single-particle motion in a liquid is first used to calculate the frequency spectrumg(ω) of a liquid metal near freezing. In this treatmentg(ω) is characterized by shear (η) and bulk viscosities, plus a time τ breaking the coherence of normal mode oscillations within a ‘cell’ or subvolume. The connection with earlier treatments of the relation between self-diffusion coefficient D and η at the melting temperatureTmof liquid metals is pointed out.

ISSN:0031-9104    

DOI:10.1080/00319109208027273

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

The protonation behaviour of Tris(hydroxy methyl)amino methane was investigated in water-pyridine mixtures up to 30 wt% pyridine using the Cellat 30°C. The pKBH+of Tris H+decreases gradually with increasing composition of pyridine and this variation has been rationalised in terms of solute-solvent interactions in these mixtures through the relationwhere the subscriptssandwrepresent the solvent mixture and water respectively and δGt0's represent the Gibbs energies of transfer of the various species from water to water-pyridine mixtures.

ISSN:0031-9104    

DOI:10.1080/00319109208027274

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

Excess molar volumes at the temperature 308.15 K were obtained for the mixture (o-xylene +n-heptane), (o-xylene + toluene), (o-xylene +n-hex-1-ene), (n-heptane + toluene), (n-heptane +n-hex-1-ene), (o-xylene +n-heptane + toluene), and (o-xylene +n-heptane +n-hex-1-ene) from density measurements with a vibrating-tube densimeter. Variable-degree polynomials have been fitted to the results and several ways of predicting the excess volumes of the ternary mixture from experimental results for the binary mixtures are compared. Some of the experimental values are used to test the predictions of the Nitta-Chao model.

ISSN:0031-9104    

DOI:10.1080/00319109208027275

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

Excess molar volumes of binary 1,1-oxybisbutane +n-heptane, 1,1-oxybisbutane + cyclohexane, 1,1-oxybisbutane +n-octane, 1,1-oxybisbutane + chlorobenzene and 1,1-oxybisbutane + 2,2,4-trimethylpentane mixtures have been measured at 298.15 K. For the first three systems,VmEis positive throughout the entire concentration range.VmEis negative for binary mixtures containing 1,1-oxybisbutane with chlorobenzene and 2,2,4-trimethylpentane.

ISSN:0031-9104    

DOI:10.1080/00319109208027276

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

Excess volumes of mixing,VE, for binary mixtures of tetrahydrofuran (THF) with 1,2-dichloroethane, 1,1,1-trichloroethane, 1,1,2,2-tetrachloroethane, trichloroethene and tetrachloroethene have been measured dilatometrically at 303.15 K over the entire composition range. Values ofVEare negative in all the mixtures except in the system, THF + 1,2-dichloroethane, wherein an inversion in sign ofVEis observed. The experimental results are interpreted in terms of molecular interactions.

ISSN:0031-9104    

DOI:10.1080/00319109208027277

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

In a thermodynamically non-ideal solution, the interdiffusion coefficientD(c)of a two-component system is a function of the concentrationc. Since the mean concentrationcin a diaphragm cell remains constant during interdiffusion, we have found it useful to expandD(c)in a Taylor series aboutc. After truncating the series and substituting the result into the diaphragm cell transport equation, we obtain a Bernoulli ordinary differential equation, which we solve in closed form. This solution is experimentally tested by determiningD(c)from diaphragm cell data which we accumulated on aqueous hydrochloric acid at 25°C. Our results are in qualitative agreement with those of R. H. Stokes, who obtainedD(c)from diaphragm cell data by using a graphical method [J. Am. Chem. Soc.72, 2243 (1950)].

ISSN:0031-9104    

DOI:10.1080/00319109208027278

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

It is proposed that the force on a solid sphere moving in a dense liquid can be written, when reduced suitably to dimensionless units, as a function of three parameters: (i) The Reynolds number (ii) the ratio of two forces characteristic of the liquid and (iii) the ratio of two lengths, namely an interface thickness divided by the sphere radius. The relation of this to the Stokes regime is exhibited. The additional parameters entering when the sphere is replaced by a bubble are finally noted.

ISSN:0031-9104    

DOI:10.1080/00319109208027279

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

This is a scanned image of the original Editorial Board page(s) for this issue.

ISSN:0031-9104    

DOI:10.1080/00319109208027271

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor