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Estimates of turbulence mechanisms in circulating fluidized bed combustors

Eric Peirano (Institutionen för energiomvandling) ; G. Palchonok ; Filip Johnsson (Institutionen för energiomvandling) ; Bo Leckner (Institutionen för energiomvandling)
Powder Technology (0032-5910). Vol. 96 (1998), 2, p. 90-105.
[Artikel, refereegranskad vetenskaplig]

Estimates of the characteristic time scales (particle relaxation time, eddy-particle interaction time, interparticle collision time), and the energy dissipation mechanisms are performed together with a turbulent kinetic energy budget, for a simple equilibrium shear flow with conditions similar to those of a circulating fluidized bed (CFB) combustor. Based on dimensional analysis, the influence of five parameters is investigated: the Eulerian integral length scale in the gas phase, the gas-particle density ratio, the mean velocity gradient, the particle diameter, and the particle volume fraction. The results show significant differences between particles of Geldart groups A and B regarding response to gas phase turbulence, transition from dense to dilute suspensions, pressure and temperature dependence, and also energy dissipation mechanisms.

Nyckelord: Turbulence, Gas-solid flow, Circulating beds, Fluidized beds, Combustors



Denna post skapades 2006-09-19. Senast ändrad 2016-08-15.
CPL Pubid: 5207

 

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Institutioner (Chalmers)

Institutionen för energiomvandling (1900-2003)

Ämnesområden

Teknisk mekanik

Chalmers infrastruktur