Critical Behavior of the Ultrasonic Attenuation for the Binary Mixture of Water and Phenol

The dynamic shear viscosity of the binary liquid mixture water – phenol was measured for different temperatures and concentrations using the glass capillary and digital viscometers. Dynamic shear viscosity anomaly was detected near the critical temperature = 67 °C and the critical concentration = 33.9% by weight of phenol. The specific heat at constant pressure was calculated using the two scale factor universality and found to be 241.9 . The critical and the background isobaric thermal expansion coefficients were determined and found to be 2.729 x10 °Cˉ1 and 22.59 x10 °Cˉ1 respectively. Ultrasonic attenuation data at 9, 15, 30 and 35 MHz were analyzed using the dynamic scaling theory of Ferrell and Bhattacharjee. The values of versus 6 yields a straight line as predicted by the theory. The experimental values of ( ) ( ) for water – phenol were compared to the scaling function F(ω*') and showed good agreement with the theory.