MEASUREMENTS OF AVERAGE HEAT TRANSFER COEFFICIENTS FOR A MESH SIMULATING POROUS PARACHUTE CLOTH

Abstract

Experimental heat transfer studies have been performed on three screens simulating a porous parachute. The average Nusselt number was measured as a function of the sonic Reynolds number. The range of the sonic Reynolds number extended from 5 to about 1400. Three different porosities and two different pressure ratios were used. Within the range of porosities and pressure ratios investigated, no significant effect of these parameters on the average heat transfer coefficient could be established. The Nusselt numbers for screens are shown to have a behavior quite similar to the Nusselt number for a single cylinder in cross flow. The relation Nu(L+D)/Re = 5 appears to be an acceptable representation of the average Nusselt numbers on screens for sonic Reynolds numbers above 400 for which rarefaction effects are not present. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1968
Accession Number
AD0830445

Entities

People

  • Charles J. Scott
  • E. R. Eckert
  • M. Ruiz-urbieta

Organizations

  • University of Minnesota

Tags

Communities of Interest

  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Accuracy
  • Boundaries
  • Boundary Layer
  • Coefficients
  • Diameters
  • Electrical Resistance
  • Energy
  • Flowmeters
  • Fluid Flow
  • Heat Transfer
  • Heat Transfer Coefficients
  • Mach Number
  • Measurement
  • Physics Laboratories
  • Turbulent Mixing
  • Vacuum Pumps
  • Wind Tunnels

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  • Fluid Dynamics.