{
  "id": "1511.01367",
  "version": "v1",
  "published": "2015-11-04T15:21:09.000Z",
  "updated": "2015-11-04T15:21:09.000Z",
  "title": "Dynamic wetting and de-wetting of thin films of water under the influence of MHz surface acoustic waves",
  "authors": [
    "Gennady Altshuler",
    "Ofer Manor"
  ],
  "comment": "10 pages, 9 figures",
  "categories": [
    "physics.flu-dyn",
    "cond-mat.soft"
  ],
  "abstract": "We use both theory and experiment to study the response of partially wetting films of water and surfactant solutions to a propagating MHz vibration in the solid substrate in the form of a Rayleigh surface acoustic wave (SAW). The SAW invokes a drift of mass in the liquid film that, balanced by capillary stress, may support dynamic wetting and de-wetting along the path of the SAW. The motion of the film is governed by a non-dimensional parameter, $\\theta^3/{\\rm We}$, where $\\theta$ is the three phase contact angle and ${\\rm We}\\equiv \\rho U^2H/\\gamma$; $\\rho,~\\gamma$, $H$, and $U$ are the liquid density, liquid/vapour surface tension, film thickness, and the intensity of the SAW at the solid surface, respectively. We show partially wetting films of water and surfactant solutions atop a lithium niobate substrate, for which $\\theta^3/{\\rm We}>1$, undergo qualitatively different dynamics to fully wetting films of silicon oil, for which $\\theta^3/{\\rm We}\\ll1$, and further explore an intermediate parameter region where $\\theta^3/{\\rm We}<1$.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2015-11-04T15:21:09.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "mhz surface acoustic waves",
      "dynamic wetting",
      "thin films",
      "surfactant solutions",
      "rayleigh surface acoustic wave"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 10,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}