Heat Transfer in a Compact Tubular Heat Exchanger with Helium Gas at 3.5 MPa

Abstract

We have constructed a compact heat exchanger consisting of circular tubes in parallel brazed to a grooved base plate. This tube specimen heat exchanger was tested in an apparatus which radiatively heated the specimen on one side at a heat flux of up to 54 W/cm2, and cooled the specimen with helium gas at 3.5 MPa and Reynolds numbers of 3000 to 35 000. The measured friction factor of the tube specimen was lower than that of a circular tube with fully developed turbulent flow, although our uncertainty was high due to entrance and exit losses. The measured Nusselt number, when modified to account for differences in fluid properties between the wall and the cooling fluid, agreed with past correlations for fully developed turbulent flow in circular tubes.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1990
Accession Number
ADA474253

Entities

People

  • Douglas A. Olson
  • Michael P. Glover

Organizations

  • National Institute of Standards and Technology

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Space

DTIC Thesaurus Topics

  • Accuracy
  • Data Analysis
  • Energy
  • Engineering
  • Flow
  • Heat Exchangers
  • Heat Flux
  • Heat Transfer
  • Heat Transfer Coefficients
  • Heat Transmission
  • Measurement
  • Pressure Measurement
  • Reynolds Number
  • Standards
  • Thermal Conductivity
  • Turbulent Flow
  • United States

Readers

  • Combustion and Flow Dynamics.