使用电场控制穿过电解质的湍流阻力
Controlling turbulent drag across electrolytes using electric fields
摘要：
摩擦力的可逆控制是工业摩擦学中一个尚未解决的关键问题。最近的研究表明，在低滑动速度下，这种控制可以通过在电解质润滑剂上施加电场来实现。然而，在高滑动速度的现象是未知的。在本文中，我们研究了剪切下的流体动力学摩擦超过过渡到湍流。我们开发了一种新的，高度并行化，数值方法求解耦合Navier-Stokes Poisson-Nernest-Planck方程。我们的研究结果表明，湍流阻力不能控制整个稀电解质单独使用静态电场。Poisson-Nernst-Planck形式主义的局限性暗示了利用电场控制湍流阻力的方法。
英文摘要：
Reversible in operando control of friction is an unsolved challenge crucial to industrial tribology. Recent studies show that at low sliding velocities, this control can be achieved by applying an electric field across electrolyte lubricants. However, the phenomenology at high sliding velocities is yet unknown. In this paper, we investigate the hydrodynamic friction across electrolytes under shear beyond the transition to turbulence. We develop a novel, highly parallelised, numerical method for solving the coupled Navier-Stokes Poisson-Nernest-Planck equation. Our results show that turbulent drag cannot be controlled across dilute electrolyte using static electric fields alone. The limitations of the Poisson-Nernst-Planck formalism hints at ways in which turbulent drag could be controlled using electric fields.
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