Accession Number : AD0677444

Title :   TRANSITION FROM TURBULENT TO LAMINAR PIPE FLOW.

Descriptive Note : Research note,

Corporate Author : CONVAIR SCIENTIFIC RESEARCH LAB SAN DIEGO CALIF

Personal Author(s) : Sibulkin,Merwin

Report Date : OCT 1961

Pagination or Media Count : 24

Abstract : An experimental investigation of low speed pipe flow was conducted for an initially turbulent flow of air. At subcritical Reynolds numbers, as the fluid travelled downstream its velocity profile approached the parabolic distribution corresponding to laminar flow; the rate of transition towards laminar flow being more rapid at lower Reynolds numbers. Concurrent hot-wire-anemometer measurements showed a corresponding dependence on Reynolds number of the rate of decay of the longitudinal velocity fluctuations. These velocity fluctuations were also found to decay more rapidly near the wall and center of the pipe than at intermediate radii. The energy spectrum of the fluctuations was measured along the pipe centerline, and, in terms of the macroscale, these spectra were similar. (Author)

Descriptors :   (*BOUNDARY LAYER TRANSITION, PIPES), LAMINAR FLOW, TURBULENCE, REYNOLDS NUMBER, VELOCITY, BOUNDARY LAYER, ENERGY, MATHEMATICAL ANALYSIS

Subject Categories : Aerodynamics
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE