Formation, stability, and breakup of nanojets
Formation, stability, and breakup of nanojets
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DOI：
10.1126/science.289.5482.1165
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发表时间：
2000-08-18
期刊：
影响因子：
56.9
通讯作者：
Landman, U
中科院分区：
文献类型：
--
作者：
Moseler, M;Landman, U
原子分子动力学模拟揭示了速度高达每秒400米的纳米射流的形成，通过纳米级会聚金喷嘴加压注入流体丙烷，加热或涂覆喷嘴外表面以防止形成厚阻挡膜。原子的描述是相关的连续流体动力学建模通过推导的随机润滑方程，包括热触发的波动，其对动态演化的影响增加，因为射流尺寸变得更小。双锥颈形状的出现预测时，射流接近纳米级分子尺寸，偏离长螺纹的通用相似性解决方案中获得的这种波动的情况下。
Atomistic molecular dynamics simulations reveal the formation of nanojets with velocities up to 400 meters per second, created by pressurized injection of fluid propane through nanoscale convergent gold nozzles with heating or coating of the nozzle exterior surface to prevent formation of thick blocking films. The atomistic description is related to continuum hydrodynamic modeling through the derivation of a stochastic Lubrication equation that includes thermally triggered fluctuations whose influence on the dynamical evolution increases as the jet dimensions become smaller. Emergence of double-cone neck shapes is predicted when the jet approaches nanoscale molecular dimensions, deviating from the Long-thread universal similarity solution obtained in the absence of such fluctuations.