Heat transfer from a horizontal finned tube bundle in bubbling fluidized beds of small and large particles

Book · Sun Dec 31 04:00:00 EST 1995

OSTI ID:245036

Devaru, C B ^[1]; Kolar, A K ^[2]

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1. Jayachamaraja College of Engineering, Mysore (India). Dept. of Mechanical Engineering
2. Indian Inst. of Technology, Madras (India). Dept. of Mechanical Engineering

Steady state average heat transfer coefficient measurements were made by the local thermal simulation technique in a cold, square, bubbling air-fluidized bed (0.305 m x 0.305 m) with immersed horizontal finned tube bundles (in-line and staggered) with integral 60{degree} V-thread. Studies were conducted using beds of small (average particle diameter less than 1 mm) sand particles and of large (average particle diameter greater thin 1 mm) particles (raagi, mustard, millet and coriander). The fin pitch varied from 0.8 to 5.0 mm and the fin height varied from 0.69 to 4.4 mm. The tube pitch ratios used were 1.75 and 3.5. The influence of bed particle diameter, fluidizing velocity, fin pitch, and tube pitch ratio on average heat transfer coefficient was studied. Fin pitch and bed particle diameter are the most significant parameters affecting heat transfer coefficient within the range of experimental conditions. Bed pressure drop depends only on static bed height. New direct correlations, incorporating easily measurable quantities, for average heat transfer coefficient for finned tube bundles (in-line and staggered) are proposed.

• OSTI ID: 245036
• Report Number(s): CONF-950522--; ISBN 0-7918-1305-3
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
EFFICIENCY
EQUATIONS
EXPERIMENTAL DATA
FINS
FLOW RATE
FLUIDIZED BED HEAT EXCHANGERS
GAS FLOW
HEAT TRANSFER
ORIENTATION
PARAMETRIC ANALYSIS
PARTICLE SIZE
PERFORMANCE