Predictive models for circulating fluidized bed combustors
The overall objective of this investigation is to develop experimentally verified models for circulating fluidized bed (CFB) combustors. This report presents a chapter describing the kinetic theory approach used to model CFBs. New formulas for solids viscosity and granular conductivities were developed using the rigorous kinetic theory. These formulas, unlike those used in the past, cover the complete particle concentration range. Formulas developed by others and published in the Journal of Fluid Mechanics used approximate methods. Although they do not differ a great deal from the formulas developed here, the new formulas arise from integrals having a clear physical significance. Our computer codes are being changed to include the new expressions for viscosity and conductivity. In the past, we used either (1) an empirical solids viscosity or (2) kinetics theory viscosity in the dense region and fluid turbulence in the dilute region. 27 refs., 3 figs.
- Research Organization:
- Illinois Inst. of Tech., Chicago, IL (USA). Dept. of Chemical Engineering
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (USA)
- DOE Contract Number:
- FG22-89PC89769
- OSTI ID:
- 5901522
- Report Number(s):
- DOE/PC/89769-T4; ON: DE91012790
- Country of Publication:
- United States
- Language:
- English
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