Flow regime identification and void fraction measurement techniques in twophase flow
Abstract
Flow regime identification and void fraction measurement are considered in vertical two phase flow. A series of chordal void fraction measurements were made and formed into the probability density function and power spectral density function. The first four moments associated with these distributions were studied to obtain objective flow regime indicator. The PDF variance, or second moment about the mean, was found to be the best indicator of flow regime. A dual beam Xray system was designed and constructed to make the chordal void fraction measurement required. This Xray system employs a dc excited tube filament, full wave rectification and voltage filtering to produce a stable photon source. The large photon flux made analog linearization of the signal possible. Local void fraction measurements were made with a Karlsruhe impedance probe.
 Publication:

Ph.D. Thesis
 Pub Date:
 August 1980
 Bibcode:
 1980PhDT........27V
 Keywords:

 Flow Velocity;
 Power Spectra;
 Probability Density Functions;
 Two Phase Flow;
 Void Ratio;
 Liquid Phases;
 Measuring Instruments;
 Fluid Mechanics and Heat Transfer