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  United States  80523
• Authors:
  • Tullis, J P
  • Wang, J S
• Publication Date: 1972-7

Media Info

• Pagination: 126 p.

Subject/Index Terms

• TRT Terms: Boundary layer; Pipe flow; Roughness; Turbulence; Turbulent boundary layer
• Old TRIS Terms: Boundary layer theory
• Subject Areas: Design; Marine Transportation;

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