Variation in Velocity Profile with Change in Surface Roughness of Boundary

Abstract

The present report deals with the variation of a turbulent velocity profile in flow from rough to smooth wall and vice versa. Expressions obtained for the shear-stress distribution with respect to the distance from the point of junction of the different roughnesses and from the wall distance, are utilized to ascertain the developing velocity distributions. Under simplified assumptions, the use of these formulas renders possible the integration of the motion equations for the shear stress. This calculation is carried out and compared with the experiments. Despite the fact that the assumptions in this particular case do not prove to be wholly correct, comparatively good agreement is achieved in the most important region.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1939
Accession Number
ADB806152

Entities

People

  • W. Jacobs

Organizations

  • National Advisory Committee for Aeronautics

Tags

Communities of Interest

  • Air Platforms
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Boundaries
  • Computational Fluid Dynamics
  • Differential Equations
  • Dynamic Pressure
  • Equations
  • Equations Of Motion
  • Flow
  • Fluid Dynamics
  • Fluid Mechanics
  • Grain Size
  • Measurement
  • Mechanical Properties
  • Shear Stresses
  • Static Pressure
  • Stresses
  • Surface Roughness
  • Transitions

Readers

  • Fluid Dynamics.