Nanoscale Jet Collision and Mixing Dynamics

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• 作者：Sohail Murad ; Ishwar K. Puri
• 刊名：Nano Letters
• 出版年：2007
• 出版时间：March 2007
• 年：2007
• 卷：7
• 期：3
• 页码：707 - 712
• 全文大小：801K
• 年卷期：v.7,no.3(March 2007)
• ISSN：1530-6992

文摘

Micro- and macroscale investigations have shown that colliding drops always coalesce for small values of the Weber number We = U²d/.Our molecular dynamic simulations show that nanojets always recoil following head-on collision even though We 0. The duration betweencollision and recoil is a function of the nanojet impact velocity U_o and the nature of intermolecular interactions. Evaporation, which promotesmixing, occurs during recoil and is enhanced by reducing intermolecular interactions. Thereafter, mixing occurs through diffusion. The mixingdynamics are independent of U_o and the orifice shape. Consistent with a continuum analysis, the characteristic nanojet diameter at stagnationd_s,1 U_o, recoil time following collision U_o^-2, and the number of evaporating molecules N U_o.