Inherent rheology of a granular fluid in uniform shear flow.
Inherent rheology of a granular fluid in uniform shear flow.
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均匀剪切流中颗粒流体的固有流变学。
DOI：
10.1103/physreve.69.061303
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
J. Dufty
中科院分区：
文献类型：
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作者：
Andrés Santos;V. Garzó;J. Dufty
与正常流体相比，剪切下的颗粒流体支持具有均匀温度和密度的稳定状态，因为碰撞冷却可以局部补偿粘性加热。结果表明，这种稳定状态的流体动力学描述是固有的非牛顿。因此，牛顿剪切粘度不能从均匀剪切流动的实验或模拟中确定。对于给定的非弹性程度，剪切粘度对剪切速率的完全非线性依赖性要求分析非定常流体动力学行为。使用玻尔兹曼动力学方程的近似格拉德解澄清了与查普曼-恩斯科格方法推导流体力学的关系。
In contrast to normal fluids, a granular fluid under shear supports a steady state with uniform temperature and density since the collisional cooling can compensate locally for viscous heating. It is shown that the hydrodynamic description of this steady state is inherently non-Newtonian. As a consequence, the Newtonian shear viscosity cannot be determined from experiments or simulation of uniform shear flow. For a given degree of inelasticity, the complete nonlinear dependence of the shear viscosity on the shear rate requires the analysis of the unsteady hydrodynamic behavior. The relationship to the Chapman-Enskog method to derive hydrodynamics is clarified using an approximate Grad's solution of the Boltzmann kinetic equation.
DOI：
--
发表时间：
2007
期刊：
影响因子：
--
作者：
H.Akiyoshi;H.Miyachi;H.Sakuma;津川光太郎
通讯作者：
津川光太郎