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Chapter 7 Fluidisation
Bubbling bed numerical simulation at Tsuji laboratory, Osaka University
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Answers to problems:
Q1 - see equation (7.4) and note use of Sauter mean diameter

Q2
i) the correct answer is (b)
ii) the correct answer is (a)
iii) the correct answer is (a)
iv) the correct answer is (d)
v) The use of the Kozeny-Carman equation was justified, as the Modified Reynolds number is less than 2 - see the box on page 75.
vi) The fluidisation type is particulate.

Q3
i) the correct answer is (d)
ii) the correct answer is (b)
iii) the correct answer is (a)
iv) the correct answer is (d)
v) the correct answer is (c)


Q4
The by-pass is one third: 0.05 divided by 0.15. This is a gross estimation of the by-pass based on the assumption that all gas in excess of that required to fluidise the bed goes through the bed as bubbles and that the bubbles do not contact the bed solids. If you look at Figure 7.12 you will see that the gas does contact the bed particles within the cloud; hence, this will give an overestimation of real bed by-pass of fluidising gas.
    Bed expansion is 11%, determined by conducting a volume balance and using the knowledge that the residence time of a bubble within the bed is expanded bed height divided by bubble velocity.

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