Sun, 2015-08-23 13:36 — Prof. Issam Rashid Ashqer

Research Title:

Two – Scale – Factor Universality of Binary Liquid Critical Mixture
Country:

Palestine
Date:

Wed, 2015-04-22 Research Abstract:

The
dynamic shear viscosity of a binary liquid mixture phenol – water has
been measured at different temperatures and concentrations. The critical
temperature Tc and critical concentration x_c are found to be 67.0℃ and
33.90% by weight of phenol respectively, the critical density ρc is
measured to be 0.8952 gm/cm3. The critical and background amplitudes of
specific heat at constant pressure are calculated to be 78.117 J/kg.K
and 85.292 J/kg.K respectively. The pressure derivative of the critical
temperature along the critical line T_c^' is calculated to be 9.722
×10-6 K/Pa. The
dynamic shear viscosity of binary liquid mixture phenol – cyclohexane
has been measured at different temperatures and concentrations. The
critical temperature Tc and critical concentration x_c are found to be
17.0℃ and 2.70% by weight of phenol respectively. The critical density
ρc is measured to be 0.7627 gm/cm3. The critical and background
amplitudes of isobaric thermal expansion coefficient αpc and αpb are
calculated to be 4×10-6 K-1, 6×10-4 K-1 respectively. The pressure
derivative of the critical temperature T_c^' for the binary is
calculated to be 1.083 × 10-8 K/Pa. The
universal quantity R+ξ of both binary liquid critical mixtures phenol –
water and phenol – cyclohexane are calculated to be 0.2716 and 0.2699
respectively. The values are in a good agreement with the theoretical
value of R+ζ. The two binary liquid critical mixtures belong to the
class of universality "Two – Scale – Factor Universality".