Accession Number : AD0705071

Title :   AN EXPERIMENTAL INVESTIGATION OF THE STABILITY OF POISEUILLE FLOW.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF

Personal Author(s) : Westbrook,Richard Evans

Report Date : DEC 1969

Pagination or Media Count : 66

Abstract : A theoretical and experimental investigation of the stability of developing laminar flow in a circular pipe subjected to small, rotationally symmetric (torsional) disturbances is presented. Analytically, developing mean velocity profiles were represented in polynomial series form and subsequent formulations yielded determinations on stability which reduce to the classical conclusions for the case of fully developed flow. Experimentally, torsional disturbances were imposed upon a developing laminar pipe flow by sinusoidally rotating a 1.5 inch (1 diameter) length of pipe in the entrance region of a carefully constructed wind tunnel facility. For flows with maximum Reynolds numbers of 8500, maximum amplitude and frequency of oscillation were 1/2 inch and 30 Hz., respectively. Hot wire anemometer measurements verified the stability of the developing flow field. Moreover, measured wave speeds and decay factors compare favorably to calculated values. (Author)

Descriptors :   (*HYDRODYNAMICS, STABILITY), (*LAMINAR FLOW, PIPES), TURBULENCE, REYNOLDS NUMBER, TORSION, THESES

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE