Phase discrimination and analysis of hot-film signals in gas-particle two-phase flows

M. L. Ritsch, J. H. Davidson

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The use of thermal anemometry to measure gas phase turbulence modification by fine particles is discussed. The bridge voltage signal digitized and spikes produced by particle impingement on the hot-wire probe are replaced by holding the last digital value before each spike. Spikes are detected using a slope threshold technique. This procedure is shown to have negligible effect on the gas flow field assuming that the duration of the spikes is short compared to the time between spikes. Measurements obtained in a gas-liquid, two-dimensional duct flow (Reynolds number - 2500), with oleic acid particles (mean particle diameter = 2 μm) in concentrations of 4 × 10-5 g/cm3, illustrate the technique.

Original languageEnglish (US)
Title of host publicationExperimental Techniques in Multiphase Flows
PublisherPubl by ASME
Pages59-63
Number of pages5
ISBN (Print)0791808645
StatePublished - Dec 1 1991
EventWinter Annual Meeting of the American Society of Mechanical Engineers - Atlanta, GA, USA
Duration: Dec 1 1991Dec 6 1991

Publication series

NameAmerican Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED
Volume125

Other

OtherWinter Annual Meeting of the American Society of Mechanical Engineers
CityAtlanta, GA, USA
Period12/1/9112/6/91

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