Analysis of Pressure Fluctuations in Bubbling Beds
Date Issued
2004
Date
2004
Author(s)
Lau, De-Bin
DOI
zh-TW
Abstract
Abstract
The minimum fluidizing velocity was determined by the measurement of pressure drop and pressure fluctuations at various axial positions in a 0.1m i.d., 1.8m high bubbling bed. The sand particles used in this study with mean particle size 163 , 280 , 323 and 500 .
The result showed that there was the same Umf by Davidson and Harrison (1963)method at various probe locations in the same static bed height. And the same result to determined Umf by puncochar et al. (1985) at differential probe locations(plenum-10cm, plenum-20cm…). this is the best way to determine Umf in this study.
The dominant frequency was found to be nearly independent of air velocity and probe locations at absolute pressure fluctuations, but to decrease with increasing static bed height at absolute and differential pressure fluctuations. And the dominant frequency decreased with the increasing probe locations at differential pressure fluctuations for low air velocity, high air velocity didn’t.
The =X ’s parameter “X” was dependent of dominant frequency at differential probe locations (plenum-10cm, plenum-20cm…).
Subjects
氣泡床壓力擾動
Analysis of Pressure Fluctuations in Bubbling Beds
Type
thesis
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