| PRESSURE FLUCTUATIONS IN GAS-SOLIDS FLUIDIZED BEDS |
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| 作者姓名： | HsiaotaoBi AihuaChen |
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| 作者单位： | FluidizationResearchCentre,DepartmentofChemicalandBiologicalEngineenngUniversityofBritishColumbia,2216MainMarl,Vancouver.BC.V6TlZ4.Canada |
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| 摘 要： | Pressure fluctuation data measured in a series of fluidized beds with diameters of 0.05, 0.1, 0.29, 0.60 and 1.56 m showed that the maximum amplitude or standard deviation increased with increasing the superficial gas velocity and static bed height for relatively shallow beds and became insensitive to the increase in static bed height in relatively deep beds. The amplitude appeared to be less dependent on the measurement location in the dense bed. Predictions based on bubble passage, bubble eruption at the upper bed surface and bed oscillation all failed to explain all observed trends and underestimated the amplitude of pressure fluctuations, suggesting that the global pressure fluctuations in gas-solids bubbling fluidized beds are the superposition of local pressure variations, bed oscillations and pressure waves generated from the bubble formation in the distributor region, bubble coalescence during their rise and bubble eruption at the upper bed surface.
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| 关 键 词： | 气固流化床 压力波动 沸腾流化床 最大压力振幅 压力波 扩大效应 |
PRESSURE FLUCTUATIONS IN GAS-SOLIDS FLUIDIZED BEDS |
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| HsiaotaoBi AihuaChen.PRESSURE FLUCTUATIONS IN GAS-SOLIDS FLUIDIZED BEDS[J].China Particuology,2003,1(4):139-144. |
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| Authors: | Hsiaotao Bi Aihua Chen |
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| Abstract: | Pressure fluctuation data measured in a series of fluidized beds with diameters of 0.05, 0.1, 0.29, 0.60 and 1.56 m showed that the maximum amplitude or standard deviation increased with increasing the superficial gas velocity and static bed height for relatively shallow beds and became insensitive to the increase in static bed height in relatively deep beds. The amplitude appeared to be less dependent on the measurement location in the dense bed. Predictions based on bubble passage, bubble eruption at the upper bed surface and bed oscillation all failed to explain all observed trends and underestimated the amplitude of pressure fluctuations, suggesting that the global pressure fluctuations in gas-solids bubbling fluidized beds are the superposition of local pressure variations, bed oscillations and pressure waves generated from the bubble formation in the distributor region, bubble coalescence during their rise and bubble eruption at the upper bed surface. |
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| Keywords: | bubbling fluidized beds pressure fluctuations maximum pressure amplitude pressure waves scaleup effect |
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