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External heat transfer in polydispersed fluidized beds at elevated temperatures

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Abstract

The authors present results of a theoretical and experimental study of heat transfer in polydispersed fluidized beds of coarse particles at temperatures up to 1273 K.

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Abbreviations

a :

tube radius

Cf :

specific heat of the gas

di :

mean diameter of the i-th fraction

g:

acceleration due to gravity

H:

height of the fluidized bed

J=ρfu:

mass flow rate of gas

ℓ0 :

thickness of the gas film on the heat transfer surface

m0 :

porosity at the onset of fluidization

m:

porosity

r:

radius

R:

radius of the equipment

tf, °C, Tf, °K:

gas temperature

T0 :

initial gas temperature

Tt8, Tw :

temperature of the fluidized bed and of the heat transfer surface, u, u0, speed of filtration and speed at the start of fluidization

a:

heat-transfer coefficient

εw, εb :

emissivities of the heat transfer surface, and the fluidized bed

εS :

emissivity of the particles

ɛe :

effective (apparent) emissivity of the fluidized bed

ηf :

viscosity of the gas

λf :

thermal conductivity of the gas

λf 0=λf0 c+ncfJd2/m:

thermal conductivity of the gas at tf=0°C

λf c :

molecular thermal conductivity of the gas

〈λf c〉:

at temperature (Tw+Tt8)/2

λf0 c :

molecular thermal conductivity of the gas at tf=0°C, Λ=glf/glf0 c

ρS, ρf :

density of particles in the gas

σ:

Stefan-Boltzmann constant

Ar=gd1ρfρS-ρf)/ηf 2 :

Archimedes Number

Pe=cfJℓ0 2/Hmλf0 c :

Peclet number

Re=ud1ρf/ηf :

Reynolds Number

Literature cited

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Authors and Affiliations

  1. A. V. Lykov ITMO, Academy of Sciences of the Belorussian SSR, Minsk

    V. A. Borodulya, Yu. S. Teplitskii, A. P. Sorokin, V. V. Matsnev, I. I. Markevich & V. I. Kovenskii

  2. I. I. Polnzuov NPO TsKTI, Leningrad

    V. A. Borodulya, Yu. S. Teplitskii, A. P. Sorokin, V. V. Matsnev, I. I. Markevich & V. I. Kovenskii

Authors
  1. V. A. Borodulya
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  2. Yu. S. Teplitskii
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  3. A. P. Sorokin
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  4. V. V. Matsnev
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  5. I. I. Markevich
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  6. V. I. Kovenskii
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Additional information

Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 56, No. 5, pp. 767–773, May, 1989.

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Borodulya, V.A., Teplitskii, Y.S., Sorokin, A.P. et al. External heat transfer in polydispersed fluidized beds at elevated temperatures. Journal of Engineering Physics 56, 541–546 (1989). https://doi.org/10.1007/BF01297603

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  • DOI: https://doi.org/10.1007/BF01297603

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