PARTICLE SIZE ANALYSIS BY SEDIMENTATION

TWO METHODS OF DETERMINING THE SIZE DISTRIBUTION OF VERY FINE POWDERS BY SEDIMENTATION IN LIQUIDS ARE PRESENTED. BOTH METHODS RESULT IN A DESCRIPTIVE MEASURE CALLED THE 'STOKESIAN DIAMETER' OF THE PARTICLES WHICH IS BASED ON THE TERMINAL VELOCITY OF PARTICLES IN FLUIDS AS PREDICTED BY STOKES' LAW. ONE OF THE METHODS, GRAVITY SEDIMENTATION USING A RECORDING BALANCE, IS USEFUL IN THE NOMINAL RANGE OF PARTICLE SIZE OF 5-100 MICRONS. THE SECOND, PHOTOSEDIMENTATION, UTILIZES CENTRIFUGATION TO EXTEND THE RANGE DOWN TO THE AREA OF 0.1 TO 10 MICRONS. TECHNIQUES OF EXPERIMENTATION AND METHODS OF DATA REDUCTION ARE DISCUSSED IN DETAIL FOR BOTH METHODS. COMPLETE COMPUTER PROGRAMS FOR DATA ANALYSIS AND SAMPLE OUTPUTS ARE INCLUDED AS APPENDICES. /AUTHOR/

• Supplemental Notes:
  • Rept No ARL-71-0134
• Corporate Authors:

  Wright-Patterson Air Force Base

  Harry G. Armstrong Aerospace Medical Research Laboratory
  Wright-Patterson AFB, OH  United States  45433
• Authors:
  • Shelnutt, W
• Publication Date: 1971-8

Media Info

• Pagination: 114 p.

Subject/Index Terms

• TRT Terms: Centrifuges; Computer programs; Data analysis; Data reduction; Force; Friction factor; Mathematical analysis; Powders; Sedimentation; Spheres; Velocity
• Uncontrolled Terms: Particle size distribution
• Old TRIS Terms: Centrifuging; Stokes law
• Subject Areas: Geotechnology; Highways;

Filing Info

• Accession Number: 00230146
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: Final Rept
• Files: TRIS
• Created Date: Jun 19 1973 12:00AM