A Landau-Squire Nanojet
Fluid Dynamics
2013-11-13 v1 Soft Condensed Matter
Abstract
Fluid jets are found in nature at all length scales, from microscopic to cosmological. Here we report on an electroosmotically driven jet from a single glass nanopore about 75 nm in radius with a maximum flow rate ~15 pL/s. A novel anemometry technique allows us to map out the vorticity and velocity fields that show excellent agreement with the classical Landau-Squire solution of the Navier Stokes equations for a point jet. We observe a phenomenon that we call flow rectification: an asymmetry in the flow rate with respect to voltage reversal. Such a nanojet could potentially find applications in micromanipulation, nanopatterning, and as a diode in microfluidic circuits.
Cite
@article{arxiv.1311.2640,
title = {A Landau-Squire Nanojet},
author = {Nadanai Laohakunakorn and Benjamin Gollnick and Fernando Moreno-Herrero and Dirk G. A. L. Aarts and Roel P. A. Dullens and Sandip Ghosal and Ulrich F. Keyser},
journal= {arXiv preprint arXiv:1311.2640},
year = {2013}
}
Comments
20 pages, 4 figures