| Popis: |
The effect of shear on phase separation in a binary fluid mixture has been studied by monitoring the steady-state transmitted intensity of a laser beam through a continuously stirred mixture of isobutyric acid and water. Measurements were made on samples with five different off-critical compositions and one at the critical composition of the binary mixture, for three different stirring frequencies in each case. The data for the onset of phase separation in the stirred samples that are as far away as 500 mK from the critical point compare favorably with the theory of Onuki and Takasue and with similar measurements on very off-critical mixtures of 2-6 lutidine plus water reported by K. Y. Min et al.$---- However, as the composition gets closer to the critical composition significant differences arise. The main feature is that the measured suppression in temperature peaks at an off-critical composition which is dependent on the stirring frequency. A simple, analytical calculation is also found to show the same feature. |
