Drying of Pastes in Vibro-Fluidized Beds: Effects of the Amplitude and Frequency of Vibration
Drying of Pastes in Vibro-Fluidized Beds: Effects of the Amplitude and Frequency of Vibration
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DOI：
10.1080/07373930500209681
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发表时间：
2005-09
影响因子：
3.3
通讯作者：
R. V. Daleffe;M. C. Ferreira;J. Freire
中科院分区：
文献类型：
--
作者：
R. V. Daleffe;M. C. Ferreira;J. Freire
振动流化床的无量纲振动数（r）是衡量振动流化床振动能量最常用的参数。它被定义为振幅（A）和振动频率（f）的函数。文献中的大多数工作都将结果表示为Γ的函数，并将其作为一个单一参数来解释振动流化床流体动力学行为的结果，而与A和f的大小无关。但从定义上看，不同的A和f值组合在一起就可以得到相同的Γ值，因此，从振动能量的角度来分析振动流化床的流体动力学行为还需要进一步的研究。因此，在这项工作中，将通过选择A和f值的不同组合来研究无因次振动数对振动流化床流体动力学行为的影响，以提供相同的r值。对干床和湿床进行了试验，试验值为r = 0.0（流化床）、1.0、2.0和4.0。结果表明，在振动流化床中，当以r作为表征振动效果的唯一参数时，必须谨慎使用，因为在不同的振幅和频率下，在固定的r下检测到非常不同的流体动力学行为。
Abstract The dimensionless vibration number (Γ) is the parameter most widely applied to quantify the vibration energy of a vibro-fluidized bed. It is defined as a function of the amplitude (A) and of the frequency of vibration (f). Most works in literature present their results as a function of Γ, which is adopted as a single parameter to explain the results on fluid dynamic behavior of vibro-fluidized beds, independent on the magnitudes of A and f. From its definition, however, it is possible to obtain identical values of Γ just by combining different values of A and f, and further studies are necessary for a better analysis of fluid dynamic behavior of vibro-fluidized beds concerning their vibration energy. Therefore, in this work the effects of dimensionless vibration number on the fluid dynamic behavior of a vibro-fluidized bed will be investigated by choosing different combinations of A and f values arranged to provide identical values of Γ. The tests were carried out for dry and wet beds, for values of Γ = 0.0 (fluidized bed), 1.0, 2.0, and 4.0. The results indicate that Γ must be used carefully when applied as the only parameter to characterize the vibration effects in a vibro-fluidized bed since very different fluid dynamic behavior was detected at a fixed Γ at different amplitudes and frequencies.