Mon, 2015-08-24 10:47 — Prof. Issam Rashid Ashqer

Type:

Thesis

Year:

2015

Students:

Maryam Reehan

Attachment | Size |
---|---|

critical_Behavior_of_the_Ultrasonic_Attenuation_for_the_Binary_Mixture_of_Water_and_Phenol.pdf | 1.38 MB |

Abstract:

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 T_(c )= 67 °C and the critical
concentration x_c= 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 J/(kg K) . The critical and the background
isobaric thermal expansion coefficients were determined and found to be
2.729 x10-3 °Cˉ¹ and 22.59 x10-3 °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 α_c/f^2
versus f^(ˉ¹˙⁰⁶) yields a straight line as predicted by the theory. The
experimental values of α(x_c,T)/(α_c (x_c,T_c)) for water – phenol were
compared to the scaling function F(ω*') and showed good agreement with
the theory.