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

Journal Article · Wed Jan 01 00:00:00 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), Vol. 25:1
• Country of Publication: United States
• Language: English

Related Subjects

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