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Calculation of coolant pressure losses.

Il calcolo delle perdite di carico di un fluido secondario.

Author(s) : GRAZZINI G., FERRARO P.

Type of article: Article

Summary

Despite the opinion of some investigators, the presence of ice crystals in a coolant always increases pressure losses and, consequently, the energy requirements of pumps. Regarding two-phase ethylene glycol-ice mixtures, the errors made by using the Darcy-Weisbach formula, in combination with the Blasius formula, are of the same order of magnitude as the differences between the correlation results obtained from various direct experiments on two-phase mixtures. The formulae normally used for the calculation of pump power input with single-phase mixtures can be used with two-phase mixtures, obviously on the condition that the relevant physical parameters of the diphasic mixture are taken into account.

Details

  • Original title: Il calcolo delle perdite di carico di un fluido secondario.
  • Record ID : 2000-2532
  • Languages: Italian
  • Source: Zero sotto Zero - vol. 8 - n. 4
  • Publication date: 1999/05
  • Document available for consultation in the library of the IIR headquarters only.

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