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Titolo:
Radiation emitted from fluidizing particles adjacent to a heated surface in a fluidized bed
Autore:
Yamada, J; Kurosaki, Y; Morikawa, T;
Indirizzi:
Yamanashi Univ, Dept Mech Syst Engn, Kofu, Yamanashi 4008511, Japan Yamanashi Univ Kofu Yamanashi Japan 4008511 ofu, Yamanashi 4008511, Japan Univ Electrocommun, Dept Mech & Control Engn, Chofu, Tokyo 1828585, Japan Univ Electrocommun Chofu Tokyo Japan 1828585 Chofu, Tokyo 1828585, Japan Kubota Corp, Energy Technol Dept, Amagasaki, Hyogo 661, Japan Kubota CorpAmagasaki Hyogo Japan 661 l Dept, Amagasaki, Hyogo 661, Japan
Titolo Testata:
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
fascicolo: 1, volume: 40, anno: 2001,
pagine: 104 - 113
SICI:
1290-0729(200101)40:1<104:REFFPA>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Keywords:
fluidized bed; radiative heat transfer; visualization; heat exchanger; dispersed medium; radiation; heat transfer;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
11
Recensione:
Indirizzi per estratti:
Indirizzo: Yamada, J Yamanashi Univ, Dept Mech Syst Engn, Takeda 4, Kofu, Yamanashi 4008511, Japan Yamanashi Univ Takeda 4 Kofu Yamanashi Japan 4008511 8511, Japan
Citazione:
J. Yamada et al., "Radiation emitted from fluidizing particles adjacent to a heated surface in a fluidized bed", INT J TH SC, 40(1), 2001, pp. 104-113

Abstract

We experimentally investigated the radiation heat exchange occurring in a gas-solid fluidized bed (kept at 25 degreesC) between the fluidizing particles and a remotely-heated heat transfer surface (30 degreesC). To evaluate this heat exchange,radiation emitted from the fluidizing particles towards the heated surface was measured through a transparent heat transfer surfaceusing an infrared imager. Our experimental results revealed that the fluidizing particles are mainly heated by conduction during the contact period with the surface and/or by gas convection in the thermal boundary layer, andthat these heated particles frequently emit a significant amount of radiation energy toward the surface. Based on these results, a method for evaluating the radiation heat exchange between the heat transfer surface and the fluidizing particles is proposed. The proposed method shows that particle diameter is one of the most significant parameters in the radiation heat exchange, and predicts that the radiation heat exchange increases with increasing particle diameter. (C) 2001 Editions scientifiques et medicales ElsevierSAS.

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Documento generato il 22/01/20 alle ore 13:03:33