Effects of increasing particle loading in an axisymmetric, vertical, liquid-solid sudden expansion flow

Founti Maria, A; Achimastos Thomas, J; Dimopoulos Demetrios, A

dc.contributor.author	Founti Maria, A	en
dc.contributor.author	Achimastos Thomas, J	en
dc.contributor.author	Dimopoulos Demetrios, A	en
dc.date.accessioned	2014-03-01T02:48:15Z
dc.date.available	2014-03-01T02:48:15Z
dc.date.issued	1994	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/33674
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0028138030&partnerID=40&md5=cf75525815fe0895d273c886d5be6f61	en
dc.subject.other	Anemometers	en
dc.subject.other	Correlation methods	en
dc.subject.other	Diesel fuels	en
dc.subject.other	Glass	en
dc.subject.other	Laser Doppler velocimeters	en
dc.subject.other	Particles (particulate matter)	en
dc.subject.other	Refractive index	en
dc.subject.other	Signal processing	en
dc.subject.other	Turbulent flow	en
dc.subject.other	Velocity measurement	en
dc.subject.other	Axisymmetric vertical liquid solid sudden expansion flow	en
dc.subject.other	Burst peak detectors	en
dc.subject.other	Fluid particle slip velocities	en
dc.subject.other	Laser Doppler anemometry	en
dc.subject.other	Particle concentration	en
dc.subject.other	Particle loading	en
dc.subject.other	Reattachment point	en
dc.subject.other	Recirculation zone	en
dc.subject.other	Transient recorders	en
dc.subject.other	Two phase flow	en
dc.title	Effects of increasing particle loading in an axisymmetric, vertical, liquid-solid sudden expansion flow	en
heal.type	conferenceItem	en
heal.publicationDate	1994	en
heal.abstract	Measurements of particle and fluid velocities are reported for a turbulent, axisymmetric, two-phase sudden expansion flow flowing in the direction of gravity and laden with solid particles, at loadings equal to 1%, 2%, 3%, 4% and 5% per volume. The measurements are compared to the characteristics of the equivalent single phase flow. Laser Doppler anemometry has been employed for the velocity measurements and the signals have been processed by a transient recorder and a burst peak detector which discriminated on the amplitude of the bursts resulting from the two discrete phases, namely diesel oil and round glass particles. The experimental set-up has been refractive index matched allowing measurements at high particle loadings. The measurements indicated a consistent correlation between the mean reattachment point and the volumetric particle loading. For all the two phase flows examined reattachment lay upstream the measured mean reattachment point of the corresponding single phase flow. Increasing particle concentration affected locally the flow behaviour, with most obvious consequences within the recirculation zone, where the measured mean fluid-particle slip velocities increased with increasing particle loading. Reattachment lengths increased with increasing particle loading, but never recovered to the value measured for the single phase flow.	en
heal.publisher	Publ by ASME, New York, NY, United States	en
heal.journalName	American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED	en
dc.identifier.volume	180	en
dc.identifier.spage	83	en
dc.identifier.epage	92	en