Shear-rate dependence of the viscosity of the Lennard-Jones liquid at the triple point

Journal Article · Fri Nov 15 04:00:00 EST 1991 · Physical Review A. General Physics; (United States)

DOI:https://doi.org/10.1103/PhysRevA.44.6936· OSTI ID:6094674

Ferrario, M ^[1]; Ciccotti, G ^[2]; Holian, B L ^[3]; Ryckaert, J P ^[4]

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1. Istituto di Fisica Teorica, Universita di Messina, Cassella Postale 50, 98166 S. Agata di Messina (Italy)
2. Dipartimento di Fisica, Universita di Roma La Sapienza,'' piazzale Aldo Moro 2, 00185 Roma (Italy)
3. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
4. Pool de Physique, Universite Libre de Bruxelles, Campus Plaine, Code Postal 223, B-1050 Bruxelles (Belgium)

High-precision molecular-dynamics (MD) data are reported for the shear viscosity {eta} of the Lennard-Jones liquid at its triple point, as a function of the shear rate {dot {epsilon}} for a large system ({ital N}=2048). The Green-Kubo (GK) value {eta}({dot {epsilon}}=0)=3.24{plus minus}0.04 is estimated from a run of 3.6{times}10{sup 6} steps (40 nsec). We find no numerical evidence of a {ital t}{sup {minus}3/2} long-time tail for the GK integrand (stress-stress time-correlation function). From our nonequilibrium MD results, obtained both at small and large values of {dot {epsilon}}, a consistent picture emerges that supports an analytical (quadratic at low shear rate) dependence of the viscosity on {dot {epsilon}}.

• OSTI ID: 6094674
• Journal Information: Physical Review A. General Physics; (United States), Journal Name: Physical Review A. General Physics; (United States) Vol. 44:10; ISSN 1050-2947; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

665000* -- Physics of Condensed Matter-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COMPUTERIZED SIMULATION
CORRELATION FUNCTIONS
COUETTE FLOW
FLUID FLOW
FLUIDS
FUNCTIONS
LENNARD-JONES POTENTIAL
LIQUIDS
NONLINEAR PROBLEMS
POTENTIALS
RELAXATION TIME
SIMULATION
TRIPLE POINT
VISCOSITY
VISCOUS FLOW