Friction Coefficients in the Inlet Length of Smooth Round Tubes

Abstract

An experimental study was made of friction coefficients near the inlet of smooth, round tubes with bellmouth entrances. The tube size ranged from 3/8 inch to 4 inches. Tests were made both with water and with air at low Mach numbers. Near the inlet,the tests indicated a zone in which the developing boundary layer is laminar, followed by a zone in which the boundary layer is turbulent. Transition from a laminar to turbulent boundary layer was found to occur at a Reynolds number of about 5 x 10 sup 5. An approximate method for predicting the discharge coefficient of rounded-entrance flow nozzles, based on the reported results, is presented and is shown to compare well with published data on flow nozzles.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1948
Accession Number
ADA801444

Entities

People

  • Ascher H. Shapiro
  • R. D. Smith

Organizations

  • Massachusetts Institute of Technology

Tags

DTIC Thesaurus Topics

  • Accuracy
  • Coefficients
  • Diameters
  • Equations
  • Flow
  • Fluid Dynamics
  • Friction
  • Gages
  • Laminar Flow
  • Manometers
  • Measurement
  • Physical Properties
  • Precision
  • Reynolds Number
  • Turbulence

Fields of Study

  • Physics

Readers

  • Electrical Engineering
  • Fluid Dynamics.