Experimental tests and modeling of the optimal orifice size for a closed cycle 4He sorption refrigerator

J. Lau, M. Benna, M. Devlin, S. Dicker, L. Page

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


Closed cycle 4He sorption refrigerators are an increasingly popular choice for remote cryogenic operations. The presence of a superfluid film on the inner walls of the evaporation pot limits their performance. We present a simple model of the gas, film, and heat flow in a 4He sorption refrigerator, taking into account the effects of an orifice to limit superfluid film flow. The model serves as a useful guideline for optimizing cryogenic performance. We also present a diagram of hold time vs. steady state temperature as a function of the radius of the orifice and compare the model to measurements.

Original languageEnglish (US)
Pages (from-to)809-814
Number of pages6
Issue number11
StatePublished - Nov 2006

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Physics and Astronomy(all)


  • He II systems (E)
  • Sorption coolers (E)
  • Superfluid helium (He II) (B)


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