Back to Search
Start Over
Stokes-Einstein diffusion of critical fluctuations in a fluid
- Source :
- Physical Review A. 22:282-284
- Publication Year :
- 1980
- Publisher :
- American Physical Society (APS), 1980.
-
Abstract
- The diffusion coefficient associated with the order-parameter fluctuations near the critical point of fluids is expected to vanish asymptotically as $D=\frac{\mathrm{RkT}}{6\ensuremath{\pi}\ensuremath{\eta}\ensuremath{\xi}}$, where $\ensuremath{\eta}$ is the viscosity, $\ensuremath{\xi}$ the correlation length, and $R$ a universal constant. Our experiments, using 3-methylpentane-nitroethane, yield $R=1.02\ifmmode\pm\else\textpm\fi{}0.06$, in agreement with the mode-coupling theory of critical fluctuations, but in disagreement with the value $\frac{R}{6\ensuremath{\pi}}=\frac{1.2}{6\ensuremath{\pi}}\ensuremath{\simeq}\frac{1}{5\ensuremath{\pi}}$, recently suggested by several investigators.
Details
- ISSN :
- 05562791
- Volume :
- 22
- Database :
- OpenAIRE
- Journal :
- Physical Review A
- Accession number :
- edsair.doi...........06c63ba2fa38ff888a1272a45b52a248