Heat transfer in a small diameter tube at high Reynolds numbers

Oleg V. Vitovsky, Maksim S. Makarov, Vladimir E. Nakoryakov, Viktor S. Naumkin

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Investigation results on heat transfer in low-Prandtl helium-xenon gas mixture and air, flowing in a small diameter tube, are presented. New experimental data on the heat transfer coefficient in the flow of helium-xenon mixture are obtained; results of numerical simulation are compared with the experimental data and known empirical correlations. Based on the simulation data it is shown that in a heated tube an increase in the Reynolds number due to an increase in the flow rate intensifies the heat transfer, and it may be due to the flow acceleration. It is shown that the high flow velocity and significant acceleration have a considerable effect on heat transfer in a tube, and the use of mean-mass stagnation temperatures as the determining one for generalization of data on heat transfer is insufficient. For the studied conditions, the known correlations give a significant error in determination of the heat transfer coefficient: the lower the Prandtl number and gas density, the higher the error.

Original languageEnglish
Pages (from-to)997-1003
Number of pages7
JournalInternational Journal of Heat and Mass Transfer
Volume109
DOIs
Publication statusPublished - 1 Jun 2017
Externally publishedYes

Keywords

  • Accelerated flow
  • Compressible flow
  • Heat transfer
  • Internal turbulent flow
  • Low Prandtl number
  • Mass-average recovery temperature
  • Recovery factor
  • Stagnation parameters

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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