Equation Of State Method Research Articles

Bubble Temperature Data for Phenol-n-Propanol System

Abstract In order to supplement the literature data on VLE, isobaric bubble temperature data were collected for the system phenol-n-propanol over the entire composition range by indirect method using a standard Swietoslawski type ebulliometer. The measurements were made at 200, 400 and 710 mm Hg. The experimental t — x data were correlated with both equation of state method and gamma-phi methods. In the former approach the Soave equation of state is used wherfeas in the latter one Wilson, NRTL and UNIQUAC models are used.

A PWM control method and steady‐state characteristics of a new current output‐type GTO converter

This paper describes first the main circuit configuration and the principle of output configuration and the principle of out-put voltage control. Next, the conditions required for input-output characteristics improvement and resonance prevention are discussed. The effect of PWM pattern on the converter characteristics is analyzed by the state equation method. The analyzed results are compared with the experimental results

Bubble Temperature Data for Phenol-Alcohol Systems 1. Phenol-I-propanol System

Abstract Isobaric bubble temperature data were collected for the system phenol-i-propanol over the entire composition range by indirect method using a standard Swietoslawski type ebulliometer. The measurements were made at 209, 412 and 711 mm Hg. The experimental t-x data were correlated with both Gamma-Phi method and equation of state method. In the former approach, Wilson, NRTL and UNIQUAC equations are used whereas in the latter case Soave equation of state is used.

Stochastic prediction of the creep of creep-resisting alloys using the Monte Carlo method

1. The author describes the development and experimental verification, with special reference to ZhS6KP structural creep-resisting nickel alloy, of the method of predicting the statistical sample of the creep curves for the arbitrary law of temperature-force loading on the basis of the equation of state of creep derived by I. I. Trunin using the Monte Carlo method on the basis of the determined distribution functions of the parameters of this equation. The data obtained in prediction can be used to determine the required probability characteristics of creep which are essential for engineering and design calculations for the reliable estimate of the service life of structural members operating in high-temperature creep conditions. The method greatly reduces the volume and duration of expensive long-term laboratory creep tests. 2. The developed packet of the applied programs make it possible to use this method for any other equation of state of creep and represents the general method of solving various applied problems of creep in probability formulation.

Theoretical methods for the prediction of phase equilibria in hydrogen-containing mixtures

The ability of various theoretical methods to accurately predict vapour-liquid equilibria in hydrogen-containing binary mixtures with N 2, Ar, CO, CO 2, CH 4, C 2H 4, C 2H 6 is investigated. These methods include both traditional cubic equations of state (the Peng-Robinson and original Redlich-Kwong) and a recently developed equation of state due to Deiters. Calculations are also performed with a spherical reference based perturbation theory. The results of all three approaches are compared to recent experimental data due to Streett and co-workers. It is shown that the cubic equations provide an adequate representation of the data for the simpler fluids but are poor for the more complex ones (e.g. C 2H 4, C 2H 6). The Deiters equation gives very good results for all but the most complex fluid mixtures. The perturbation theory results are somewhat mixed, being unexpectedly poor for the simplest fluids (Ar, N 2) but improving with the molecular complexity of the fluid to provide the best description of the hydrogen-ethylene and hydrogen-ethane mixtures, the hardest to predict using equation of state methods.