TY - GEN
T1 - Effect of stress wave scattering at the liquid-particle interface on viscosity calculation of nanocolloidal dispersions
AU - Wang, Tao
AU - Wang, Xinwei
AU - Hong, Haiping
AU - Luo, Zhongyang
AU - Cen, Kefa
PY - 2008
Y1 - 2008
N2 - In this work, extensive equilibrium molecular dynamics simulations are conducted to study the shear viscosity of nanocolloidal dispersion. Strong oscillation of the pressure tensor autocorrelation function is observed. The computational domain contains solvent of liquid argon at 143.4 K and spherical particles with volume fraction of 3%. By studying the effect of the particle size, particle density, and acoustic impedance, it is found for the first time that the stress wave scattering/reflecting at the liquid-particle interface due to acoustic mismatch plays a critical important role in the oscillation of pressure tensor autocorrelation function. The Brownian motion/vibration of solid particles is considered to have little effect on the oscillation of pressure tensor autocorrelation function curve except the frequency. And when the particle size is comparable with the wavelength of stress wave, the diffraction of stress wave happens at the interface that will also weaken the oscillation of pressure tensor autocorrelation function.
AB - In this work, extensive equilibrium molecular dynamics simulations are conducted to study the shear viscosity of nanocolloidal dispersion. Strong oscillation of the pressure tensor autocorrelation function is observed. The computational domain contains solvent of liquid argon at 143.4 K and spherical particles with volume fraction of 3%. By studying the effect of the particle size, particle density, and acoustic impedance, it is found for the first time that the stress wave scattering/reflecting at the liquid-particle interface due to acoustic mismatch plays a critical important role in the oscillation of pressure tensor autocorrelation function. The Brownian motion/vibration of solid particles is considered to have little effect on the oscillation of pressure tensor autocorrelation function curve except the frequency. And when the particle size is comparable with the wavelength of stress wave, the diffraction of stress wave happens at the interface that will also weaken the oscillation of pressure tensor autocorrelation function.
KW - Molecular dynamics
KW - Nanocolloidal dispersion
KW - Viscosity
UR - https://www.scopus.com/pages/publications/49449093540
U2 - 10.1115/MNHT2008-52067
DO - 10.1115/MNHT2008-52067
M3 - Conference contribution
AN - SCOPUS:49449093540
SN - 0791842924
SN - 9780791842928
T3 - 2008 Proceedings of the ASME Micro/Nanoscale Heat Transfer International Conference, MNHT 2008
SP - 1
EP - 7
BT - 2008 Proceedings of the ASME Micro/Nanoscale Heat Transfer International Conference, MNHT 2008
ER -