ISSN Online: 2377-424X
ISBN Print: 0-89116-299-2
International Heat Transfer Conference 7
EFFECT OF MIXED PARTICLE SIZES ON LOCAL HEAT TRANSFER COEFFICIENTS AROUND A HORIZONTAL TUBE IN FLUIDIZED BEDS
Résumé
The local and circumferentially-averaged heat
transfer coefficients for single horizontal tubes
was measured in air fluidized beds of mixtures of
qlass beads. Data were obtained for uniformly
sized 300 μm and 850 μm (mean diameter) glass beads
and for mixtures of the above two sizes of particles.
The amount of the smaller-size particles
was varied in steps of 5, 15, 25, 50 weight percent.
Measurements were obtained up to 3.5 m/s
superficial gas velocity. Heat transfer coefficients
were found to increase with increasing fraction
of the smaller size particles, for a given
air flow rate. Experimental results were compared
with some of the existing heat transfer correlations
using a weight-mean average particle diameter.