| Summary: | 碩士 === 中原大學 === 化學工程研究所 === 81 === The velocity profile within a 0.19m and a 0.29m I.D. vortexing
fluidized bed cold model were measured by using a five-hole
pitot tube. A new approach for calculating swirl number is
proposed in this study. A comparison among various approaches
for swirl number calculations are also made. The swirl number
is found to increase with the secondary air velocity and
decreases with the primary air velocity, the diamter of
secondary air nozzles and the diameter of imaginary circle.
Based on the experimental data, a correlation for calculating
the swirl number was obtained. It is found that the swirl
number is a combination of three factors; the exit tube
diameter divided by the total diameter of secondary air nozzles
, volumetric flow rate of secondary air and scale-up factor.
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