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Updated: Jun 22, 2026

Visualization of High Speed Liquid Jet Impaction on a Moving Surface
Published on: April 17, 2015
Molecular dynamics of a water jet from a carbon nanotube
Itsuo Hanasaki1, Toru Yonebayashi, Satoyuki Kawano
1Department of Mechanical Science and Bioengineering, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan. hanasaki@me.es.osaka-u.ac.jp
Abstract:
A carbon nanotube (CNT) can be viewed as a molecular nozzle. It has a cylindrical shape of atomistic regularity, and the diameter can be even less than 1 nm. We have conducted molecular-dynamics simulations of water jet from a (6,6) CNT that confines water in a form of single-file molecular chain. The results show that the water forms nanoscale clusters at the outlet and they are released intermittently. The jet breakup is dominated by the thermal fluctuations, which leads to the strong dependence on the temperature. The cluster size n decreases and the release frequency f increases at higher temperatures. The f roughly follows the reaction kinetics by the transition state theory. The speed of a cluster is proportional to the 1/sqrt[n] because of the central limit theorem. These properties make great contrast with the macroscopic liquid jets.
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