剪切流下由熵力驱动的界面速度
Velocity of an interface driven by an entropic force under shear flow
AI总结：
采用随机非守恒序参量模型，推导平行于剪切的平面界面速度，发现低剪切下熵项主导速度且变化与剪切速率4/3次方成比例，高剪切下速度主要由修正体熵贡献解释。
AI中文摘要：
当两相之间的体涨落幅度存在差异时，热涨落可驱动界面。我们采用随机非守恒序参量模型，研究剪切流如何改变这一机制。对于平行于所施加剪切的平面界面，我们在弱噪声和小偏置区域推导了其传播速度。驱动力包含由体涨落谱确定的剪切修正熵贡献，以及由时间反演对称性破缺产生的非平衡贡献。在低剪切速率下，熵项是剪切流零速度平面附近界面速度的主要贡献，且剪切诱导的速度变化与剪切速率的4/3次方成比例。在高剪切速率下，二维模拟表明，测得的速度主要由修正后的体熵贡献解释。
英文摘要：
Thermal fluctuations can drive an interface when bulk fluctuation amplitudes differ between two phases. We study how shear flow modifies this mechanism using a stochastic non-conserved order- parameter model. For a planar interface parallel to the imposed shear, we derive its propagation velocity in the weak-noise and small-bias regime. The driving force comprises a shear-modified entropic contribution determined by bulk fluctuation spectra and a non-equilibrium contribution arising from the breaking of time-reversal symmetry. At low shear rates, the entropic term provides the dominant contribution to the velocity of an interface near the zero-velocity plane of the shear flow, and the shear-induced change in the velocity scales as the 4/3 power of the shear rate. At high shear rates, two-dimensional simulations show that the measured velocity is largely accounted for by the modified bulk entropic contribution.
