Question 16 from the morning session of the 2014 Chemistry Examination real questions
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This post was last edited by lsl789 on 2016-7-19 08:50. The question from 2014-3-16 deals with the formula for fluidization velocity; I would like to ask everyone where this formula can be found? Thank you! The actual exam question is as follows: [2014-3-16] The design parameters for the fluidized bed are as follows: average particle size of the solids is 0.35 mm, density of the solid particles is 1800 kg/m3, temperature of the fluidizing gas is 130°C, pressure of the fluidizing gas is 0.15 MPa (A), density of the fluidizing gas is 0.3 kg/m3, and viscosity of the fluidizing gas is 2.6x10-5 (Pa·s). To prevent the fluidized bed from entering a dead state, what is the minimum flow velocity of the fluidizing gas required in m/s? Choose from the options below (A) 0.050 (B) 0.034 (C) 0.513 (D) 0.640
In the principles of chemical engineering, there are formulas provided by Xia Qing 194 from Tianjin University
In other words, in the free settlement velocity of the retention zone, 18 is replaced by 1650, and then the calculation can be done.
Why change 18 to 1650?