Accession Number : ADA193065

Title :   Characterization of Accelerating Pipe Flow.

Descriptive Note : Final rept.,

Corporate Author : NAVAL UNDERWATER SYSTEMS CENTER NEWPORT RI

Personal Author(s) : Lefebvre, Paul J

PDF Url : ADA193065

Report Date : 01 Mar 1988

Pagination or Media Count : 240

Abstract : A unique series of experiments was conducted to determine the effects of constant acceleration on the flow in a 5-cm-diameter pipe. These experiments, which differed substantially from those of previous researchers, investigated such phenomena as transition to turbulence and the general physics of the effect acceleration has on various flow parameters such as wall shear stress, velocity profile, and turbulence intensity profile. The experiments were conducted in the Naval Underwater Systems Center Flow Loop Facility, which was designed and built for this study. This facility provided the capability of programmed acceleration via a control system that uses the position of a downstream control valve for transient flow control. Based on the data collected during the experiments along with a linear momentum analysis, it was determined that hot-film wall shear stress sensors can be accurately used in transient flows up to at least 1 g acceleration. Keywords: Pipe flow; Velocity profile.

Descriptors :   *ACCELERATION, *FLUID FLOW, *TRANSIENTS, COMPUTER PROGRAMMING, CONTROL, CONTROL SYSTEMS, INTENSITY, LINEAR SYSTEMS, MATHEMATICAL ANALYSIS, MOMENTUM, PARAMETERS, PHYSICS, PIPES, PROFILES, SHEAR STRESSES, TRANSITIONS, TURBULENCE, VALVES, VELOCITY, WALLS, TEST FACILITIES, DOWNSTREAM FLOW, EXPERIMENTAL DESIGN, FLOWMETERS, VOLUME, DOPPLER SYSTEMS, LASER VELOCIMETERS

Subject Categories : Fluid Mechanics
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE