@prefix pubblicazioni: . @prefix unitaDiPersonaleInterno: . @prefix prodotto: . unitaDiPersonaleInterno:MATRICOLA18600 pubblicazioni:autoreCNRDi prodotto:ID260375 . @prefix prodottidellaricerca: . @prefix istituto: . istituto:CDS070 prodottidellaricerca:prodotto prodotto:ID260375 . unitaDiPersonaleInterno:MATRICOLA10066 pubblicazioni:autoreCNRDi prodotto:ID260375 . @prefix modulo: . modulo:ID1949 prodottidellaricerca:prodotto prodotto:ID260375 . modulo:ID2184 prodottidellaricerca:prodotto prodotto:ID260375 . @prefix rdf: . prodotto:ID260375 rdf:type prodotto:TIPO1301 . @prefix retescientifica: . prodotto:ID260375 rdf:type retescientifica:ProdottoDellaRicerca . @prefix rdfs: . prodotto:ID260375 rdfs:label "Gas-mixing in bubbling fluidized bed combustors: Hydrodynamics and macromixing associated with bubble bursting at the bed surface (Contributo in atti di convegno)"@en . @prefix xsd: . prodotto:ID260375 pubblicazioni:anno "2003-01-01T00:00:00+01:00"^^xsd:gYear ; pubblicazioni:doi "10.1115/FBC2003-111"^^xsd:string . @prefix skos: . prodotto:ID260375 skos:altLabel "
Solimene, R.a, Marzocchella, A.a, Salatino, P.a, Ragucci, R.b (2003)
Gas-mixing in bubbling fluidized bed combustors: Hydrodynamics and macromixing associated with bubble bursting at the bed surface
in 17th International Conference on Fluidized Bed Combustion, Jacksonville, Florida, May 16-21, 2003
"^^rdf:HTML ; pubblicazioni:autori "Solimene, R.a, Marzocchella, A.a, Salatino, P.a, Ragucci, R.b"^^xsd:string ; skos:note "Scopu"^^xsd:string ; pubblicazioni:affiliazioni "a Dipartimento di Ingegneria Chimica, Univ. degli Studi Napoli Federico II, P.le V. Tecchio 80, 80125 Napoli, Italy \nb Ist. di Ricerche sulla Combustione, CNR, P.le V. Tecchio 80, 80125 Napoli, Italy"^^xsd:string ; pubblicazioni:titolo "Gas-mixing in bubbling fluidized bed combustors: Hydrodynamics and macromixing associated with bubble bursting at the bed surface"^^xsd:string ; pubblicazioni:isbn "0791836800"^^xsd:string ; prodottidellaricerca:abstract "Gas-mixing phenomena may play a significant role in fluidized bed combustion of solid fuels. Issues associated with gas mixing include: a) effectiveness of mass transfer between the bubble and the emulsion phases in the bed; b) degree of mixing between segregated gaseous streams in plume-like or bubbly flow in the bottom bed; c) extent of mixing between segregated gaseous pockets/streams in the splashing zone or in\nthe upper freeboard. Among the others, issues b) and c) turn out to be relevant to fluidized bed combustion of high-volatile solid\nfuels (biomass, RDF, etc.). In this case, the rate of gas mixing often overcomes intrinsic kinetics as the rate-controlling step in\nvolatile matter burn-out, especially under \\\"stratified\\\" combustion conditions. Despite several and significant contributions to the subject, understanding of gas-mixing in bubbling fluidized beds is still poor and calls for additional investigation.\nThe present work aims at investigating gas-mixing in bubbling fluidized bed with specific reference to the above\nissue c). A laser assisted imaging technique has been used to characterize the hydrodynamic patterns associated with the\nbursting of either isolated bubbles or couples of closely timedelayed bubbles at the surface of a fluidized bed. Quantitative\nimage analysis procedures were exploited in order to assess parameters defining the general fluid-dynamic behaviour and\nmacromixing of the bubble-generated gas pockets with the mainstream gas.\nThe formation of toroidal flow structures upon bubble bursting is highlighted in the case of isolated bubbles. The\ntoroidal pockets entrain mainstream gas and grow accordingly while rising along the splash zone. Toroidal flow structures are\nobserved also in the case of couples of closely time-delayed bubbles, but interference between leading and trailing pockets\nleads to more complex structures characterized by multiple incoherent eddies.\nThe relevance of macromixing to volatile matter burning under conditions of stratified fluidized bed combustion is\nassessed and discussed."@en . @prefix ns11: . prodotto:ID260375 pubblicazioni:editore ns11:ID805 ; prodottidellaricerca:prodottoDi istituto:CDS070 , modulo:ID2184 , modulo:ID1949 ; pubblicazioni:autoreCNR unitaDiPersonaleInterno:MATRICOLA10066 , unitaDiPersonaleInterno:MATRICOLA18600 . ns11:ID805 pubblicazioni:editoreDi prodotto:ID260375 .