Thermoacoustical Excess Properties of Binary Liquid Mixtures - A Comparative Experimental and Theoretical Study

Abstract

composition range and at T = 293, 303, 313 K. The excess pseudo-Gruneisen parameter (i E ), excess molar isentropic compressibility (K E ) and excess acoustic impedance (Z E ) were also calculated. The excess deviation functions have been correlated using Redlich{Kister polynomial equation. The observed values of the excess parameters plotted against the mole fraction of tetrahydrofuran have been explained on the basis of intermolecular interaction suggesting strong interaction in tetrahydrofuran + o-cresol than in tetrahydrofuran + methanol. Partial molar isentropic compressibility at inflnite dilution and their excess values were calculated for each component. Sanchez theory, Goldsach{Sarvas volume fraction statistics, Sudgen's relation, Flory{Patterson{Rastogi and Brock and Bird model were used with the Aurebach relation to compute theoretically the values of ultrasonic velocities at varying temperatures. The velocity deviations were estimated in terms of average percentage deviations. Internal pressure for both the systems were calculated theoretically and discussed on the basis of relative applicability of the models in theoretical estimations. The isothermal compressibility (kT), for these binary mixtures were theoretically evaluated by using the Flory statistical theory and flve hard sphere models and compared with the experimental values.