Critical exponent for the viscosity of four binary liquids
10.1063/1.454890
Crossref journal-article
AIP Publishing
The Journal of Chemical Physics (317)
Abstract

We have measured the viscosity of four binary mixtures near their consolute points: (1) methanol+cyclohexane, (2) isobutyric acid+water, (3) nitroethane+3-methylpentane, and (4) 2-butoxyethanol+water. The viscosity data are consistent with the power-law divergence: η∼‖T−Tc‖−y, with an apparent viscosity exponent in the range 0.0404<y<0.0444. Recent theoretical estimates for y are near 0.032, which is outside the experimental range. The value of y is independent of whether the critical point is an upper or a lower consolute point and of whether the approach toward Tc is at constant pressure or at constant volume. Our torsion oscillator viscometer is unique in its simultaneous low frequency (∼1 Hz) and low shear rate (∼0.1 s−1), allowing its use close to the critical point before encountering non-Newtonian fluid behavior associated with critical slowing down. Nevertheless, we find quantitative evidence for viscoelasticity near the critical point.

Bibliography

Berg, R. F., & Moldover, M. R. (1988). Critical exponent for the viscosity of four binary liquids. The Journal of Chemical Physics, 89(6), 3694–3704.

Authors 2
  1. Robert F. Berg (first)
  2. Michael R. Moldover (additional)
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Dates
Type When
Created 23 years, 1 month ago (July 26, 2002, 9:12 a.m.)
Deposited 1 year, 6 months ago (Feb. 10, 2024, 3:21 a.m.)
Indexed 3 months, 1 week ago (May 26, 2025, 10:25 a.m.)
Issued 36 years, 11 months ago (Sept. 15, 1988)
Published 36 years, 11 months ago (Sept. 15, 1988)
Published Print 36 years, 11 months ago (Sept. 15, 1988)
Funders 0

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@article{Berg_1988, title={Critical exponent for the viscosity of four binary liquids}, volume={89}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.454890}, DOI={10.1063/1.454890}, number={6}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Berg, Robert F. and Moldover, Michael R.}, year={1988}, month=sep, pages={3694–3704} }