MEAN TURBULENT FLOW IN THE ENTRY REGION OF A ROUGH PIPE

General characteristics of mean turbulent flow in the entry region of a pipe were investigated. The development of wall shear stress, velocity profile, core velocity, and boundary layer thickness was studied. A mathematical model for predicting boundary layer growth in developing flow is presented. Momentum and continuity equations were used with assumptions of (1) potential flow in the core region, (2) a semi-log velocity profile for the boundary layer, and (3) a measured resistance formula from the experimental data. Results show that the model can predict satisfactorily within the first 10 to 12 pipe diameters. The experimental data were obtained in a 12-inch diameter hydraulically rough pipe. Turbulence was suppressed and a developing boundary layer was formed by a settling chamber with a converging nozzle. Water was used as the fluid.

  • Corporate Authors:

    Colorado State University, Fort Collins

    Fort Collins, CO  USA  80523
  • Authors:
    • Tullis, J P
    • Wang, J S
  • Publication Date: 1972-7

Media Info

  • Pagination: 126 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00041284
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: CER72-73JPT-JSW-2
  • Contract Numbers: N00014-67-A-02990013
  • Files: TRIS
  • Created Date: Mar 2 1973 12:00AM