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arXiv 2303.03342cond-mat.softcond-mat.stat-mechphysics.flu-dyn
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简单液体的表面粘度

Surface viscosity in simple liquids

Paolo Malgaretti, Ubaldo Bafile, Renzo Vallauri, Pál Jedlovszky, Marcello Sega

摘要:

牛顿液体对小扰动的响应通常被认为是由均匀输运系数(如剪切和湍流粘度)完全描述的。然而,在液体/蒸汽边界的流体的强密度梯度的存在暗示在一个不均匀的粘度的可能存在。在这里,我们表明,表面粘度出现从简单液体的分子模拟中的界面层的集体动力学。我们估计的表面粘度是8-16倍,小于体相流体在热力学点考虑。这一结果可能对大气化学和催化中液体表面的反应具有重要意义。

英文摘要:

The response of Newtonian liquids to small perturbations is usually considered to be fully described by homogeneous transport coefficients like shear and dilatational viscosity. However, the presence of strong density gradients at the liquid/vapor boundary of fluids hints at the possible existence of an inhomogeneous viscosity. Here, we show that a surface viscosity emerges from the collective dynamics of interfacial layers in molecular simulations of simple liquids. We estimate the surface viscosity to be 8-16 times smaller than that of the bulk fluid at the thermodynamic point considered. This result can have important implications for reactions at liquid surfaces in atmospheric chemistry and catalysis.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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