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Estimation of viscous dissipation in nanodroplet impact and spreading

机译:纳米液滴冲击和扩散中的粘性耗散估计

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摘要

The developments in nanocoating and nanospray technology have resulted in the increasing importance of the impact of micro-anoscale liquid droplets on solid surface. In this paper, the impact of a nanodroplet on a flat solid surface is examined using molecular dynamics simulations. The impact velocity ranges from 58 m/s to 1044 m/s, in accordance with theWeber number ranging from 0.62 to 200.02 and the Reynolds number ranging from 0.89 to 16.14. The obtained maximum spreading factors are compared with previous models in the literature. The predicted results from the previous models largely deviate from our simulation results, with mean relative errors up to 58.12%. The estimated viscous dissipation is refined to present a modified theoretical model, which reduces the mean relative error to 15.12% in predicting the maximum spreading factor for cases of nanodroplet impact. (C) 2015 AIP Publishing LLC.
机译:纳米涂层和纳米喷涂技术的发展已导致微/纳米级液滴对固体表面的影响越来越重要。在本文中,使用分子动力学模拟检查了纳米液滴对平坦固体表面的影响。冲击速度的范围为58 m / s至1044 m / s,根据的韦伯数范围为0.62至200.02,雷诺数的范围为0.89至16.14。将获得的最大扩展因子与文献中的先前模型进行比较。先前模型的预测结果大大偏离了我们的模拟结果,平均相对误差高达58.12%。估计的粘性耗散得到改进,以提供一种改进的理论模型,该模型将在预测纳米液滴撞击情况下的最大扩散因子时将平均相对误差降低至15.12%。 (C)2015 AIP Publishing LLC。

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