Accession Number : ADA187133

Title :   Experimental and Theoretical Study on Cavitation Inception and Bubbly Flow Dynamics. Part 1. Design, Development and Operation of a Cavitation Susceptibility Meter. Part 2. Linearized Dynamics of Bubbly and Cavitating Flows with Bubble Dynamics Effects.

Descriptive Note : Doctoral thesis,

Corporate Author : CALIFORNIA INST OF TECH PASADENA DIV OF ENGINEERING AND APPLIED SCIENCE

Personal Author(s) : D'Agostino, Luca

PDF Url : ADA187133

Report Date : May 1987

Pagination or Media Count : 325

Abstract : This theses presents the design, development and operations of a Cavitation Susceptibility Meter based on the use of a venturi tube for the measurement of the content of active cavitation nuclei in water samples. The pressure at the venturi throat is determined from the upstream pressure and the local flow velocity without corrections for viscous effects because the flow possesses a laminar potential core in all operational conditions. The detection ov cavitation and the measurement of the flow velocity are carried out optically. The apparatus comprises a Laser Doppler Velocimeter for the measurement of the flow velocity and the detection of cavitation, a custom-made electronic Signal Processor for real time generation and temporary storage of the data and a computerized system for the final acquisition and reduction of the collected data. The results of application of the Cavitation Susceptibility Meter to the measurement of the water quality of the tap water samples are presented. The results of an investigation are presented on the linearized dynamics of two-phase bubbly flows with the inclusion of bubble dynamics effects. Two flow configurations have been studied: the time dependent one-dimensional flow of a spherical bubble cloud subject to harmonic excitation of the far field external pressure and the steady state two-dimensional flow of a bubbly mixture on a slender profile of arbitrary shape.

Descriptors :   *BUBBLES, *CAVITATION, *LAMINAR FLOW, ACQUISITION, COMPUTER APPLICATIONS, DATA STORAGE SYSTEMS, DETECTION, DOPPLER SYSTEMS, DYNAMICS, EXCITATION, EXTERNAL, FAR FIELD, FLOW RATE, HARMONICS, LASER VELOCIMETERS, LINEARITY, MEASURING INSTRUMENTS, NUCLEI, ONE DIMENSIONAL FLOW, PRESSURE, REAL TIME, SAMPLING, STEADY STATE, THESES, THROAT, TIME DEPENDENCE, TWO DIMENSIONAL FLOW, TWO PHASE FLOW, VENTURI TUBES, VISCOSITY, WATER, WATER QUALITY

Subject Categories : Marine Engineering
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE