声场作用下纳米颗粒的流化行为

Fluidization performances of nanometer particles with sound field reflecting

在56 mm的玻璃流化床中,对纳米SiO2和TiO2颗粒在不同频率和声压级声场辅助下的流化行为进行了研究。实验表明,在低频（40-60 Hz）和高声压级（高于100 dB）的声场条件下,沟流和节涌得到有效抑制,纳米颗粒形成均一稳定的聚团,实现平稳流化。随声压级升高,颗粒的最小流化速度减小,流化行为类似Geldart A类颗粒。在声场的其他条件下,纳米颗粒的流化行为与不加声场相似,无法实现稳定流化。

Under different sound pressure levels and different frequencies, the fluidization performances of SiO2 and TiO2 nanometer particles were investigated in a glass fluidized bed with diameter of 56 mm. Under the conditions of low frequency of 40 -60 Hz and sound pressure level higher than 100 dB, the slug and channel can be eliminated, and the fluidization quality was promoted. Even and stable agglomerates were formed by nanometer particles. The minimum fluidization velocity decreases sharply with the sound pressure level increasing, and the fluidized curve inclines to the Geldart A group particles. It is also indicated that the different phenomena among kinds of particles were obvious.