Internal Forced Convection to Low Prandtl Number Gas Mixtures.

Abstract

AT a Prandtl number of about 0.2, the predictions of accepted correlations for heat transfer in fully established tube flow differ by a factor more than two. Since gas turbine systems proposed for propulsion use working fluids with the Prandtl number in this range it was necessary to resolve the discrepancy. By mixing helium with xenon or hydrogen with xenon, the range 0.16 < or approx = Pr < or approx = 0.7 can be obtained. Measurements with these mixtures in a vertical tube showed that the Colburn analogy and Dittus-Boelter substantially overpredict the Nusselt number for constant property conditions; best agreement was provided by relations suggested by Petukhov and by Kays. For moderated variation of gas properties (1 < T (sub w)/T (sub b) < or approx = 2.2) the correlation for average friction factor by Taylor was verified; the exponent on the Prandtl number in his equation for heat transfer was modified to 0.65 in order to accommodate these new data.

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Document Details

Document Type
Technical Report
Publication Date
Jul 15, 1984
Accession Number
ADA148932

Entities

People

  • D. M. Mceligot
  • K. E. Bauer
  • M. F. Taylor

Organizations

  • University of Arizona

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Convection
  • Energy Systems
  • Equations
  • Flow
  • Fluid Dynamics
  • Fluid Flow
  • Fluid Mechanics
  • Gas Flow
  • Gas Turbines
  • Heat Transfer
  • Measurement
  • Mechanical Engineering
  • Mechanics
  • Plastic Explosives
  • Prandtl Number
  • Thermal Conductivity
  • Turbines

Readers

  • Analytical Mechanics
  • Combustion and Flow Dynamics.
  • Fluid Dynamics.