Fluid dynamics of air in a packed bed: velocity profiles and the continuum model assumption



Document title: Fluid dynamics of air in a packed bed: velocity profiles and the continuum model assumption
Journal: Brazilian journal of chemical engineering
Database: PERIÓDICA
System number: 000308632
ISSN: 0104-6632
Authors: 1


2
Institutions: 1Universidade Federal de Sao Carlos, Departamento de Engenharia Quimica, Sao Carlos, Sao Paulo. Brasil
2Universidade Estadual Paulista "Julio de Mesquita Filho", Instituto de Biociencias, Letras e Ciencias Exatas, Sao Jose do Rio Preto, Sao Paulo. Brasil
Year:
Season: Dic
Volumen: 16
Number: 4
Pages: 421-432
Country: Brasil
Language: Inglés
Document type: Artículo
Approach: Experimental, aplicado
English abstract Air flow through packed beds was analyzed experimentally under conditions ranging from those that reinforce the effect of the wall on the void fraction to those that minimize it. The packing was spherical particles, with a tube-to-particle diameter ratio (D/dp) between 3 and 60. Air flow rates were maintained between 1.3 and 4.44 m3/min, and gas velocity was measured with a Pitot tube positioned above the bed exit. Measurements were made at various radial and angular coordinate values, allowing the distribution of air flow across the bed to be described in detail. Comparison of the experimentally observed radial profiles with those derived from published equations revealed that at high D/dp ratios the measured and calculated velocity profiles behaved similarly. At low ratios, oscillations in the velocity profiles agreed with those in the voidage profiles, signifying that treating the porous medium as a continuum medium is questionable in these cases
Disciplines: Química
Keyword: Ingeniería química,
Mecánica de fluidos,
Medios porosos,
Modelos continuos,
Columnas de lecho fijo
Keyword: Chemistry,
Chemical engineering,
Fluid mechanics,
Porous media,
Continuum models,
Fixed bed columns
Full text: Texto completo (Ver HTML)