Effect of riser exit geometry on bed hydrodynamics and heat transfer in a circulating fluidized bed riser column

Liakos, HH; Founti, MA; Markatos, NC

dc.contributor.author	Liakos, HH	en
dc.contributor.author	Founti, MA	en
dc.contributor.author	Markatos, NC	en
dc.date.accessioned	2014-03-01T01:16:27Z
dc.date.available	2014-03-01T01:16:27Z
dc.date.issued	2001	en
dc.identifier.issn	0363907X	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/14058
dc.subject	Heat transfer coefficient	en
dc.subject	Hydrodynamics	en
dc.subject	Primary air velocity	en
dc.subject	Riser column	en
dc.subject	Suspension density	en
dc.subject.other	Distillation columns	en
dc.subject.other	Fluidized beds	en
dc.subject.other	Heat transfer coefficients	en
dc.subject.other	Hydrodynamics	en
dc.subject.other	Suspensions (fluids)	en
dc.subject.other	Circulating fluidized riser column	en
dc.subject.other	Heat transfer	en
dc.subject.other	density	en
dc.subject.other	fluidized bed	en
dc.subject.other	heat transfer	en
dc.subject.other	hydrodynamics	en
dc.subject.other	riser	en
dc.subject.other	suspension	en
dc.title	Effect of riser exit geometry on bed hydrodynamics and heat transfer in a circulating fluidized bed riser column	en
heal.type	journalArticle	en
heal.identifier.primary	10.1002/1099-114X(200101)25:1<1::AID-ER659>3.0.CO;2-B	en
heal.identifier.secondary	http://dx.doi.org/10.1002/1099-114X(200101)25:1<1::AID-ER659>3.0.CO;2-B	en
heal.publicationDate	2001	en
heal.abstract	This paper reports the variation of suspension density along the riser column and the effect of riser exit geometry on bed hydrodynamics and heat transfer in the upper region of a circulating fluidized (CFB) riser column. The experiments are conducted in a CFB riser column which is 102 mm x 102 mm in bed cross-section (square), 5.25 m height, with a return leg of the same dimension. The unit is made up of interchangeable plexiglass columns. The superficial primary air velocity is varied between 4.2 and 6.4 m/s. The suspension density profile along the riser height is influenced by the exit geometry. With a 90° riser exit geometry, the suspension density profile in the upper region of the CFB riser column increases towards the riser exit. This particular trend has beeb observed for about 2 m length in the top region of the riser. The change in suspension density profile in the top region influences the variation of heat transfer coefficient. With a 90° riser exit geometry, the suspension density increases towards the riser exit, which in turn increases the heat transfer coefficient. The effect of riser exit geomentry on hydrodynamics and heat transfer is significant for about 2 m length in the upper region of the riser column. Copyright © 2001 John Wiley & Son Ltd.	en
heal.journalName	International Journal of Energy Research	en
dc.identifier.doi	10.1002/1099-114X(200101)25:1<1::AID-ER659>3.0.CO;2-B	en
dc.identifier.volume	25	en
dc.identifier.issue	1	en
dc.identifier.spage	1	en
dc.identifier.epage	8	en