The Effects of Porous Material on Microbubble Skin Friction Reduction.

Abstract

Previous results have shown that the injection of a high concentration of microbubbles into a turbulent boundary layer can produce sizeable skin friction reductions. The present paper investigates the role of the porous material in this phenomenon. A variety of different porous surfaces have been tested: a series of sintered metal plates with widely different pore sizes; a specially constructed porous material, composed of plastic strips; and two different porous section lengths. The effects of gravity were determined by changing the orientation of the porous surface with respect to the boundary layer. A notable conclusion is that the skin friction reduction is not critically related to the characteristics of the porous material.

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Document Details

Document Type
Technical Report
Publication Date
Dec 09, 1983
Accession Number
ADA143401

Entities

People

  • C. L. Merkle
  • N. K. Madavan
  • S. Deutsch

Organizations

  • Pennsylvania State University

Tags

Communities of Interest

  • Ground and Sea Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Boundary Layer
  • Corporations
  • Drag
  • Drag Reduction
  • Flow Rate
  • Materials
  • Measurement
  • Mechanical Engineering
  • Military Research
  • Navy
  • Photographs
  • Porous Materials
  • Reynolds Number
  • Skin Friction
  • Standards
  • Strain Gages
  • Turbulent Boundary Layer

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Surface Engineering/Surface Coating Technology.
  • Underwater engineering and Marine Technology.