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Thermocapillary flow in double-layer fluid structures: an effective single-layer model.

Nivedita R Gupta1, Hossein Haj-Hariri, Ali Borhan

  • 1Department of Chemical Engineering, University of New Hampshire, Durham, NH 03824, USA.

Journal of Colloid and Interface Science
|August 2, 2005
PubMed
Summary
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Adding a viscous encapsulant layer significantly reduces thermocapillary flow intensity in materials processing. This study shows a simplified single-layer model accurately predicts flow and interface deformation in double-layer systems.

Area of Science:

  • Fluid dynamics
  • Materials science
  • Microgravity science

Background:

  • Thermocapillary flows are crucial for melt crystal growth, especially in microgravity.
  • Buoyancy-driven convection is minimized under microgravity, highlighting the importance of thermocapillary effects.

Purpose of the Study:

  • To investigate thermally driven convection in a two-immiscible-liquid system within a differentially heated rectangular cavity under zero gravity.
  • To analyze the impact of a more viscous encapsulant layer on thermocapillary flow and interface deformation.

Main Methods:

  • Numerical simulation of fluid dynamics in a two-layer system.
  • Development and validation of a modified single-layer model for predicting flow behavior.
  • Analysis of interface deformations and flow patterns based on encapsulant viscosity and thickness.

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Main Results:

  • A viscous encapsulant layer significantly reduces thermocapillary flow intensity.
  • Interface deformations differ qualitatively from free-surface cases due to the encapsulant's higher viscosity.
  • Flow patterns and interface deformations are sensitive to encapsulant layer thickness and viscosity.

Conclusions:

  • The flow in a double-layer system can be accurately approximated by a single-layer model with modified interface stress conditions.
  • The developed single-layer model effectively predicts flow behavior even for large aspect-ratio systems.