Instability and freezing in a solidifying melt conduit

Miranda C. Holmes-Cerfon, J. A. Whitehead

Research output: Contribution to journalArticle

Abstract

Previous works have shown that when liquid flows in a pipe whose boundary temperature is below freezing, a tubular drainage conduit forms surrounded by solidified material that freezes shut under the appropriate combination of forcing conditions. We conduct laboratory experiments with wax in which the tube freezes shut below a certain value of flux from a pump. As the flux is gradually decreased to this value, the total pressure drop across the length of the tube first decreases to a minimum value and then rises before freezing. Previous theoretical models of a tube driven by a constant pressure drop suggest that once the pressure minimum is reached, the states for a lower flux should be unstable and the tube should therefore freeze-up. In our experiments, flux and pressure drop were coupled, and this motivates us to extend the theory for low Reynolds number flow through a tube with solidification to incorporate a simple pressure-dropflux relationship. Our model predicts a steady-state relationship between flux and pressure drop that has a minimum pressure as the flux is varied. The stability properties of these steady states depend on the boundary conditions: for a fixed flux, they are all stable, whereas for fixed pressure drop, only those with a flux larger than that at the pressure drop minimum are stable. For a mixed pressureflux condition, the stability threshold of the steady states lies between these two end members. This provides a possible mechanism for the experimental observations.

Original languageEnglish (US)
Pages (from-to)131-139
Number of pages9
JournalPhysica D: Nonlinear Phenomena
Volume240
Issue number2
DOIs
StatePublished - Jan 15 2011

Keywords

  • Fluid dynamics
  • Magma
  • Melt conduits
  • Solid/melt interface
  • Stability analysis
  • Viscous fluid

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Mathematical Physics
  • Condensed Matter Physics
  • Applied Mathematics

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