skip to main content

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

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.
Authors:
 [1] ;  [2]
  1. Jayachamaraja College of Engineering, Mysore (India). Dept. of Mechanical Engineering
  2. Indian Inst. of Technology, Madras (India). Dept. of Mechanical Engineering
Publication Date:
OSTI Identifier:
245036
Report Number(s):
CONF-950522--
ISBN 0-7918-1305-3; TRN: IM9627%%402
Resource Type:
Book
Resource Relation:
Conference: 13. international conference on fluidized-bed combustion, Orlando, FL (United States), 7-10 May 1995; Other Information: PBD: 1995; Related Information: Is Part Of 13. international conference on fluidized bed combustion: Proceedings. Volume 1; Heinschel, K.J. [ed.] [Air Products and Chemicals, Inc., Allentown, PA (United States)]; PB: 719 p.
Publisher:
American Society of Mechanical Engineers, New York, NY (United States)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; FLUIDIZED BED HEAT EXCHANGERS; PERFORMANCE; HEAT TRANSFER; ORIENTATION; FINS; PARTICLE SIZE; PARAMETRIC ANALYSIS; GAS FLOW; FLOW RATE; EFFICIENCY; EQUATIONS; EXPERIMENTAL DATA