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Heat transfer studies between particles and liquid medium in a fluidized bed

✍ Scribed by Narsimha Rao Sunkoori; Ramalingam Kaparthi

Publisher
Elsevier Science
Year
1960
Tongue
English
Weight
674 KB
Volume
12
Category
Article
ISSN
0009-2509

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✦ Synopsis

The heat transfer coefficients between the particles and the fluidizing medium under unsteady state conditions, are determined by transient heating of cold water stream, with hot solid particles dropped into the fluidizing bed, in a specially designed liquid fluidizing column. Heat transfer coefficients varying from 113 to 620 B.t.u/hr/fts/"F are obtained and these values increase with increase in particle diameter and mass velocity. The present data are also compared with previous published data on gas fluidized beds. RBsume-Les coefficients de transfert de chaleur entre les particules et le milieu fluidisant dans des conditions d'dtat non atationnaire sont d&rmint% par le chauffage fugace du courant d'eau froide, B I'aide de particules solides chaudes projetties dans le lit fluid% d'une colonne de fluid&&ion liquide. Les auteurs obtiennent des coefficients de transfert de chaleur variant de 113 B 620 B.t.u/hr/f@/OF et ces valeurs augmentent avec l'accroissement du diambtre des particules et la vitesse massique. Ces don&es sont compades avec celles publi&ee antbrieurement sur les lita de gas fluidis&. Zusammenfassung-Die Wiirmeiibergangskoeffizienten zwischen den Teilchen und dem fluidisierenden Medium im in&&ion&en Zustand wurden dadurch bestimmt, dass ein Valter Wasserstrom durch in das Flies&&t geworfene heisse Teilchen in einer dafiir besonders eingerichteten Kolonne nichtstationiir erwtirmt wurde. Die Wiirmeiibergangskoflizienten betrugen &#I bis 3500 W/ms grd und stiegen an mit dem Teilchendurchmesser und mit der Massengeschwindigkeit. Die erhaltenen Werte wurden mit frtiher vetiffentlichten Daten fiir Gas-Flies&e&n verglichen. STUDIES on heat transfer between solid particles and a fluidizing medium are necessary to elucidate the mechanism of dissipation of heat of reaction, heat of dilution etc., in a fluidized bed and also in fluidized bed reactor design. KETTENRING

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