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首页> 外文会议>Micro/Nanoscale Heat Transfer International Conference 2008 >EFFECT OF STRESS WAVE SCATTERING AT THE LIQUID-PARTICLE INTERFACE ON VISCOSITY CALCULATION OF NANOCOLLOIDAL DISPERSIONS
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EFFECT OF STRESS WAVE SCATTERING AT THE LIQUID-PARTICLE INTERFACE ON VISCOSITY CALCULATION OF NANOCOLLOIDAL DISPERSIONS

机译：液-质界面处应力波散射对纳米胶体分散体黏度计算的影响

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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.
机译：在这项工作中，进行了广泛的平衡分子动力学模拟，以研究纳米胶体分散体的剪切粘度。观察到压力张量自相关函数的强烈振荡。计算域包含143.4 K的液态氩溶剂和体积分数为3％的球形颗粒。通过研究颗粒大小，颗粒密度和声阻抗的影响，首次发现由于声失配而引起的液-气界面应力波的散射/反射在压力振荡中起着至关重要的作用。张量自相关函数。除频率外，固体颗粒的布朗运动/振动被认为对压力张量自相关函数曲线的振荡影响很小。当粒径与应力波的波长相当时，应力波在界面处发生衍射，这也会削弱压力张量自相关函数的振荡。

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