RECENT EXPERIMENTAL AND THEORETICAL EXTENSIONS OF NEARLY FREE MOLECULAR FLOW

Abstract

Since 1962 a continuing program of drag force measurement in the near free molecule and free molecule regimes has been carried out at Berkeley extending the range of flow conditions to higher Mach numbers and utilizing both cylindrical and flat strip models. Cylinder drag data were obtained at Mach numbers of approximately 6, 8, and 10 with a range of Knudsen numbers from approximately 1 to 32. Flat strip drag data for the model normal to the flow were obtained at approximately the same Mach numbers with a similar range of Knudsen numbers. All results approach diffuse free molecule flow limiting conditions for high Knudsen numbers; typical data are presented. Previous results at Mach approximately 5.92 using uniform flow field testing techniques were essentially duplicated, the maximum discrepancy being 2.8%, utilizing the free jet testing methods.

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Document Details

Document Type
Technical Report
Publication Date
Jun 22, 1964
Accession Number
AD0603440

Entities

People

  • D. Roger Willis
  • Dong S. Ko
  • G. J. Maslach
  • Stephen Tang

Organizations

  • University of California, Berkeley

Tags

Communities of Interest

  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Aeronautical Engineering
  • Agreements
  • Collisions
  • Engineering
  • Equations
  • Experimental Data
  • Flow
  • Flow Fields
  • Free Stream
  • Gas Dynamics
  • Heat Transfer
  • Knudsen Number
  • Mach Number
  • Mean Free Path
  • Test Methods
  • Two Dimensional
  • United States

Fields of Study

  • Physics

Readers

  • Aerodynamics/Aeronautics.
  • Combustion and Flow Dynamics.