Initial density dependence of experimental viscosities and of calculated diffusion coefficients of the binary vapor mixtures methanol-benzene and methanol-cyclohexane

Temperature and Initial Density Dependence of Experimental Viscosity and Calculated Diffusion Coefficients for Binary Vapor Mixtures of Benzene-Phenol

“…These findings previously shown for the binary vapor mixtures methanol-benzene and methanol-cyclohexane [22] as well as benzene-toluene and benzene-p-xylene [23], were confirmed by the results for the system benzene-phenol. Whereas the influence of the initial density dependence of viscosity cannot be neglected at low reduced temperatures, it becomes more difficult to differentiate between its influence and the effects of thermal alterations and measurement errors when the temperature is increased.…”

“…The needed values of B u and B^ were calculated from their temperature functions for benzene [22] and phenol [10], which were determined as polynomials in 1/T via an evaluation scheme using intermolecular potential models and experimental data.…”

“…The theoretical basis and the scheme for the evaluation of the experimental data concerning the initial density dependence have already been described [22,23]. Therefore, a summary of the ideas and of the formulas is only given here.…”

“…It has been shown [22,23] that, in principle, there is a need to take into account the real-gas behavior and the initial density dependence of the proportionality constant of the mass flux (pD 12 ) in order to obtain more accurate values of the diffusion coefficient at atmospheric pressure at low temperatures:…”

“…In two previous papers the viscosity coefficients of the mixtures of methanol-benzene and methanol-cyclohexane [22] as well as of benzene-toluene and benzene-p-xylene [23] were measured. In a first step the experimental data were evaluated via the Chapman-Enskog theory because of the relatively low densities of the measurements.…”