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Marangoni Instabilities in Microencapsulation

[+] Author Affiliations
Pravin K. Subramanian, Abdelfattah Zebib

Rutgers University, Piscataway, NJ

Paper No. IMECE2003-41377, pp. 219-223; 5 pages
doi:10.1115/IMECE2003-41377
From:
  • ASME 2003 International Mechanical Engineering Congress and Exposition
  • Heat Transfer, Volume 4
  • Washington, DC, USA, November 15–21, 2003
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 0-7918-3718-1 | eISBN: 0-7918-4663-6, 0-7918-4664-4, 0-7918-4665-2
  • Copyright © 2003 by ASME

abstract

Hollow spherical shells used as laser targets in inertial confinement fusion (ICF) experiments are made by microencapsulation. During the final phase of manufacturing the spherical shells contain a solvent (fluorobenzene, FB) and a solute (polystyrene, PAMS) in a water environment. As the solvent evaporates it leaves behind the desired hardened plastic spherical shells, 1–2 mm in diameter. Perfect sphericity is demanded for efficient fusion ignition. We model this drying process and investigate conditions for incipient instabilities driven by surface tension dependence on concentration (buoyant forces are negligible in this micro-scale problem).

Copyright © 2003 by ASME

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