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A mechanism of anomalous dust settling in a catalyst bed

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Abstract

Anomalous dust settling by a working catalyst bed is considered. The proposed mechanism of dust settling is based on electrical phenomena near the catalyst surface.

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Abbreviations

A 0 :

empirical coefficient in formula (3), A/(m2 K2)

C :

mean square speed of ions, m/s

D :

coefficient in formula (3) that accounts for the difference between the ideal and actual emission conditions

d :

diameter of a dust particle, m

e :

1.6 x 10-19-electron charge, C

E :

electric field strength, V/m

f t :

thermal conductivity of a particles and the gas medium (depends on particle size)

F c :

Coulomb attracting force, N

F t :

thermophoretic force, N

j :

thermionic current, A/m2

k :

Boltzmann constant

l :

radius of a catalyst grain, m

m :

ion weight, kg

N 0 :

mean ion concentration, nr-3

q :

charge of a dust particle, C

r :

radius of a dust particle, m

t :

charging time, s

T- :

absolute temperature of the gas, K

T 1 :

temperature of the gas flow, K

T 2 :

temperature of the catalyst surface, K

V :

steady-state speed of a particle, m/s

ε0 :

8.85 x 10

-12 :

permittivity of vacuum, F/m

ε:

relative permittivity (for gases, ε ≏1)

λ:

free path length of gas molecules, m

υ:

dynamic viscosity of the gas, Pa s

v:

kinematic viscosity of the gas, m2/s

Ο:

surface-charge density, C/m2

Φ:

electron work function, eV

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Authors and Affiliations

  1. Karpov Institute of Physical Chemistry, ul. Vorontsovo pole 10, 103064, Moscow, Russia

    I. A. Nevskii, M. M. Tomishko, V. S. Beskov, G. M. Semenov, M. Yu. Zezin & A. V. Putilov

Authors
  1. I. A. Nevskii
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  2. M. M. Tomishko
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  3. V. S. Beskov
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  4. G. M. Semenov
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  5. M. Yu. Zezin
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  6. A. V. Putilov
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Nevskii, I.A., Tomishko, M.M., Beskov, V.S. et al. A mechanism of anomalous dust settling in a catalyst bed. Theor Found Chem Eng 34, 90–93 (2000). https://doi.org/10.1007/BF02757471

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