Study of polygonal water bells

Inertia-dominated thin-film flows over microtextured surfaces

Emilie Dressaire, Laurent Courbin, Adrian Delancy, Marcus Roper, Howard A. Stone

Research output: Contribution to journalArticle

Abstract

Microtextured surfaces are commonly used to study complex hydrodynamic phenomena such as spreading and splashing of liquid droplets. However, although surface topography is known to modify near-surface flow, there is no theory able to quantitatively predict the dramatic changes in dynamics of liquid spreading and splashing. Here, we investigate experimentally water bells formed on micropatterned surfaces in order to characterize the hydrodynamics of inertia-dominated flows through regular porous layers. Water bells are self-suspended catenary-shaped liquid films created when a jet impinges on a horizontal disc called an impactor. We show that the presence of micrometre-sized posts regularly arranged on the impactor results in a decrease of the water bell radius and the loss of axisymmetry as open water bells adopt polygonal shapes. We introduce a simple model that captures the main features of the inertia-dominated flow and reveals the role of the hydrodynamic interactions between neighbouring posts. In addition to their applications for tunable jet atomization, these polygonal sheets provide a paradigmatic system for understanding inertia-dominated flow in porous media.

Original languageEnglish (US)
Pages (from-to)46-57
Number of pages12
JournalJournal of Fluid Mechanics
Volume721
DOIs
StatePublished - Apr 2013

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bells
inertia
splashing
Thin films
impactors
Hydrodynamics
hydrodynamics
thin films
water
Water
liquids
atomizing
Liquid films
Liquids
Atomization
Surface topography
Porous materials
micrometers
topography
radii

Keywords

  • interfacial flows (free surface)
  • porous media
  • thin films

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Condensed Matter Physics

Cite this

Study of polygonal water bells : Inertia-dominated thin-film flows over microtextured surfaces. / Dressaire, Emilie; Courbin, Laurent; Delancy, Adrian; Roper, Marcus; Stone, Howard A.

In: Journal of Fluid Mechanics, Vol. 721, 04.2013, p. 46-57.

Research output: Contribution to journalArticle

Dressaire, Emilie ; Courbin, Laurent ; Delancy, Adrian ; Roper, Marcus ; Stone, Howard A. / Study of polygonal water bells : Inertia-dominated thin-film flows over microtextured surfaces. In: Journal of Fluid Mechanics. 2013 ; Vol. 721. pp. 46-57.
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