Sublimation as a function of diffusion

Gang Qian, Nathan T. Morgan, Russell J. Holmes, E. L. Cussler, Wayne D. Blaylock, Robert D J Froese

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


Purification of large organic molecules in a tubular sublimator occurs by a combination of laminar flow, Knudsen diffusion, and volume diffusion. For laminar flow, the amount purified per area per driving force varies with pd2, where p is pressure and d is tube diameter. For Knudsen diffusion, it varies with d and is not a function of pressure. For volume diffusion, it is constant, consistent with experiment. This volume diffusion mechanism may offer an alternative explanation to slip flow for dilute gas transport of both organic semiconductors and common low molecular weight gases.

Original languageEnglish (US)
Pages (from-to)861-867
Number of pages7
JournalAIChE Journal
Issue number3
StatePublished - Mar 1 2016

Bibliographical note

Publisher Copyright:
© 2016 American Institute of Chemical Engineers.


  • Diffusion
  • Electronics (organic)
  • Flow (compressible)
  • Sublimation


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