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Flow rate instabilities under self-sustained cooling.

Author(s) : RUDMAN I. K.

Type of article: Article

Summary

A new explanation for the phenomenon of flow rate instabilities appearing under self-sustained cooling of cryostat elements with large temperature gradients is proposed. This explanation takes into consideration the presence of a reciprocal inverse connection (feedback) between the fluctuations of gas flow rate and the heat influx along a solid element in a liquid at the liquid-vapour boundary. Conditions under which these flow-rate instabilities occur are determined. The stability boundaries of helium flow rate into the channels of the cryostat construction elements made of copper and austenitic stainless steel are computed. The calculated stability boundaries are in agreement with published experimental data. Some measures that prevent the development of flow-rate instabilities are also suggested.

Details

  • Original title: Flow rate instabilities under self-sustained cooling.
  • Record ID : 1995-2718
  • Languages: English
  • Source: Cryogenics - vol. 34 - n. 7
  • Publication date: 1994/07

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