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Heat Transfer in Sprayed Spouted Beds

Authors

  • Sebastian Englart,

    1. Chair of Air-Conditioning and District Heating, Faculty of Environmental Engineering, Wroclaw University of Technology, 50-373 Wroclaw, Norwida Str. 4/6, Poland
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  • Andrzej Kmiec,

    Corresponding author
    1. Department of Chemical Engineering, Faculty of Chemistry, Wroclaw University of Technology, 50-373 Wroclaw, Norwida Str. 4/6, Poland
    • Department of Chemical Engineering, Faculty of Chemistry, Wroclaw University of Technology, 50-373 Wroclaw, Norwida Str. 4/6, Poland
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  • Agnieszka Ludwinska

    1. Chair of Air-Conditioning and District Heating, Faculty of Environmental Engineering, Wroclaw University of Technology, 50-373 Wroclaw, Norwida Str. 4/6, Poland
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Abstract

An experimental and theoretical study of the influence of various kind of beds, static bed height and ratio of mass flow of water to mass flow rate of gas on heat transfer coefficient was carried out. The results of the investigations were compared with literature correlations for predicting heat transfer in conical spouted beds. Moreover, a new correlation of dimensionless groups was developed for heat transfer during spraying spouted beds. Also, the model of Kmiec [Kmiec, “Bed Expansion and Heat and Mass Transfer in Fluidized Beds,” Sci. Pap. Inst. Chem. Eng. Heating Equip. Wroclaw Univ. Technol. 36, Monographs No. 19, Publishing House of Wroclaw University of Technology, Wroclaw, Poland, 1980a; Kmiec, Chem. Eng. J. 1980b;19,189–200] of particle circulation and heat transfer between spouting gas and particles was analyzed. The one-dimensional mathematical models for solids flow in a spout and for heat transfer in a spouted bed analyzed here lead to differential equations which, solved numerically, give results in good agreement with experimental data.

Abstract

On a mené une étude théorique et expérimentale sur l'influence du type de lit, de la hauteur de lit statique et du rapport entre le débit massique de l'eau et du gaz sur le coefficient de transfert de chaleur. Les résultats des recherches ont été comparés à des corrélations de la littérature scientifique pour la prédiction du transfert de chaleur dans des lits jaillissants coniques. En outre, une nouvelle corrélation adimensionnelle a été élaborée pour le transfert de chaleur lors de l'atomisation des lits jaillissants. De même, le modèle de Kmiec (1980a,b) sur la circulation des particules et le transfert de chaleur entre le gaz jaillissant et les particules a été analysé. Les modèles mathématiques unidimensionnels d'écoulement des solides dans un jaillissement et de transfert de chaleur dans un lit jaillissant analysés ici mènent à des équations différentielles qui, résolues de manière numérique, donnent des résultats en bon accord avec les données expérimentales.

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