By Wen-Ching Yang
Debris are very important items of chemical technique industries spanning the fundamental and forte chemical compounds, agricultural items, prescription drugs, paints, dyestuffs and pigments, cement, ceramics, and digital fabrics. Solids dealing with and processing applied sciences are hence necessary to the operation and competitiveness of those industries. Fluidization expertise is hired not just in chemical construction, it Read more...
summary: debris are very important items of chemical approach industries spanning the elemental and distinctiveness chemical compounds, agricultural items, prescribed drugs, paints, dyestuffs and pigments, cement, ceramics, and digital fabrics. Solids dealing with and processing applied sciences are therefore necessary to the operation and competitiveness of those industries. Fluidization know-how is hired not just in chemical construction, it is also utilized in coal gasification and combustion for strength iteration, mineral processing, nutrients processing, soil washing and different comparable waste remedy, environmental remediation, and source restoration techniques. The FCC (Fluid Catalytic Cracking) know-how as a rule hired within the smooth petroleum refineries is usually in line with fluidization ideas
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Sample text
40) and (42), in general, particle sphericity and dimensionless size distribution should be held constant in the scaling since they influence Emf. The use of and a mean diameter in the Ergun expression only approximates the effects of these parameters. Note if the two models display identical dynamic characteristics, then 6is a dependent variable whose distribution throughout the bed should be identical for both fluidized beds. In this limit, the governing parameters given in Eq. (45) Ueo Ps gL' ,of Uo Umf L1 Gs bed geometry, ~, PSD L2 P~ Uo where Smfwill be a function of particle sphericity and size distribution.
69) and Eq. (71), the Reynolds number and the Froude numbers are kept identical between the model and the commercial bed. Combining Gs/psUo and the product of Reynolds and Froude number along with Eq. (69), it can be shown that 58 Fluidization, Solids Handling, and Processing \vI ) Eq. (72) SO that the ratio of solids-flow to solids-density scales as the ratio of the cube root of the kinematic viscosity. Once the model fluid and its pressure and temperature are chosen, which sets the gas density and viscosity, there is only one unique set of parameters for the model which gives similarity when using the full set of dimensionless parameters.
The concern is how much the drag coefficient is impacted by the shift in Reynolds number. 12 RepE. Fluidized B e d Scale-up 45 10 ---= U o / U m f 9 10, U s i I i / U o 9 1 ..... U o A I m f 9 3, U s i W U o 9 1 ,-~ U o A J m f 9 10. 3 II # 0 0 0 0 dID 0 0 ~e I 10 100 Re 9 pUor 1000 10000 Figure 21. Ratio of drag coefficient to low Reynolds number drag coefficient, uo/umf = 10 and 3. ) 10 Uslip/Uo ..... = 1/50 Uslip/Uo = 1/200 II lu n.. v I - 1 , ~I 10 , i 100 1000 10000 Re = pUodp/l~ Figure 22.