Experimental studies of heat transfer between a bundle of horizontal tubes and a gas-solid fluidized bed of small particles

Journal Article · Fri Jul 01 00:00:00 EDT 1983 · Ind. Eng. Chem. Process Des. Dev.; (United States)

DOI:https://doi.org/10.1021/i200022a005· OSTI ID:5552696

Grewal, N S; Saxena, S C

Experimental data are obtained for heat transfer coefficient between electrically heated horizontal tube bundles (12.7 and 28.6 mm diameter) and square fluidized beds of silica sand (/sup -/d/rho/ = 167 and 504 ..mu..m) and alumina (/sup -/d/rho/ = 259 ..mu..m) as a function of air fluidizing velocity. The staggered tube bundle has its tubes located at the vertices of equilateral triangles with pitch varying between 1.75 to 9 times the tube diameter. Heat transfer data for a bundle of tubes are compared with a single tube under otherwise identical conditions and are compared with the existing correlations and theoretical models in the literature for maximum heat transfer coefficient. A correlation for the maximum heat transfer coefficient between horizontal tube bundles and a gas-solid fluidized bed of small particles (75 < Ar < 20 000) is proposed which includes the influence of tube pitch in the bundle. The predicted values of the maximum heat transfer coefficient from the proposed correlation are generally within plus or minus 20% of the experimental data available in the literature when the contribution due to radiation is also included.

• Research Organization: Mechanical Engineering Department, University of North Dakota, Grand Forks, North Dakota 58202
• DOE Contract Number: AC01-76ET10450
• OSTI ID: 5552696
• Journal Information: Ind. Eng. Chem. Process Des. Dev.; (United States), Vol. 22:3
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
FLUIDIZED BED
HEAT TRANSFER
AIR FLOW
ALUMINIUM OXIDES
CORRELATIONS
ELECTRIC HEATING
EXPERIMENTAL DATA
GASES
PARTICLES
RADIATIONS
SAND
SILICA
SOLIDS
TUBES
ALUMINIUM COMPOUNDS
CHALCOGENIDES
DATA
ENERGY TRANSFER
FLUID FLOW
FLUIDS
GAS FLOW
HEATING
INFORMATION
MINERALS
NUMERICAL DATA
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
SILICON COMPOUNDS
SILICON OXIDES
420400* - Engineering- Heat Transfer &amp; Fluid Flow