AERODYNAMIC PROPERTIES OF PERFORATED WALLS FOR USE IN A TUBE TRANSPORTATION SYSTEM

For flow in a closed wall tube the boundary condition at the tube wall is the kinematic one of no normal flow. When the tube is perforated it is shown that the average effect of many small perforations may be calculated. From a theoretically derived formula it is shown that many small holes are more effective than a few large ones. It is then shown that there exists an analogy between a body traveling in a perforated tube and a geometrically similar body tested in a tunnel test facility having longitudinal slots. Furthermore, a relationship between the geometry of the holes of the perforated tube and the geometry of the slots of the tunnel test facility is established. (Author)

• Corporate Authors:

  Oceanics, Incorporated

  Plainview, NY  United States 
• Authors:
  • Goodman, T R
• Publication Date: 1968-4

Media Info

• Pagination: 26 p.

Subject/Index Terms

• TRT Terms: Aerodynamics; Intelligent transportation systems; Pneumatic conveyors; Tubing
• Old TRIS Terms: Advanced systems; Tube systems; Tube vehicles
• Subject Areas: Operations and Traffic Management; Railroads;

Filing Info

• Accession Number: 00039027
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: TR-67-39
• Contract Numbers: C-265-66
• Files: TRIS
• Created Date: Nov 24 1973 12:00AM