Mon, 2015-08-24 10:01 — Mohammed S. Abu-Jafar

Type:

Thesis

Year:

2015

Students:

Maryam Reehan

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.

see the full file here

see the full file here