Heat transfer from an immersed vertical tube in a gas-fluidized bed

Journal Article · Wed Jan 01 04:00:00 EST 1986 · Ind. Eng. Chem. Process Des. Dev.; (United States)

DOI:https://doi.org/10.1021/i200032a024· OSTI ID:5747241

Mathur, A; Saxena, S C; Chao, A

The total heat-transfer coefficient, h/sub W/, is measured for vertical tubes of diameters 12.7, 28.6, and 50.8 mm immersed in beds of glass beads and silica sands at ambient conditions as a function of fluidizing velocity. A general trend of the dependence of h/sub W/ on the tube diameter is observed. This trend is most explicit for h/sub W,MAX/, which consistently increases as the tube diameter decreases. The correlations of Nu/sub MAX/ proposed by various investigators are found incapable of predicting Nu/sub MAX/ values, and, therefore, a correlation is proposed which reproduces all the existing and present data with +-25%. The dependence of h/sub W/ on tube diameter is discussed and explained in the context of distributor design, bed geometry, and hydrodynamics.

• Research Organization: Dept. of Chemical Eng., Univ. of Illinois at Chicago, Chicago, IL 60680
• OSTI ID: 5747241
• Journal Information: Ind. Eng. Chem. Process Des. Dev.; (United States), Journal Name: Ind. Eng. Chem. Process Des. Dev.; (United States) Vol. 25:1; ISSN IEPDA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
CHALCOGENIDES
DESIGN
ENERGY TRANSFER
FLUID MECHANICS
FLUIDIZED BEDS
GEOMETRY
HEAT TRANSFER
HYDRODYNAMICS
MATHEMATICS
MECHANICS
MINERALS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
SAND
SILICA
SILICON COMPOUNDS
SILICON OXIDES