May 16-21, 2010
The aeration behaviour of three different nano-sized powders, Al2O3, Fe2O3 and CuO, fluidized under the application of acoustic fields of different intensities (125-150 dB) and frequencies (50-300 Hz) has been characterized. The characterization of the fluidization of binary mixtures of Al2O3 and Fe2O3 has been also investigated under the application of acoustic fields of 120 Hz and of two different intensities, 130 and 135 dB, and varying the relative amount of two powders from 17 to 50 %wt of Fe2O3. The addition of Fe2O3 has a beneficial effect on fluidization quality of Al2O3 even for the lowest amount of Fe2O3. Under the effect of sound, mixing between Al2O3 and CuO nanopowders has been also quantitatively characterized by the Scanning Electron Microscopy with X-ray microanalysis (SEM/EDS) analysis of captured samples. Mixing between aggregates of the two powders takes only few minutes. However, mixing also occurs inside aggregates but this process requires times of the order of 80-150 minutes, depending on the feeding order of two powders.
Paola Ammendola and R. Chirone, "AERATION AND MIXING BEHAVIOURS OF BINARY MIXTURES OF NANO-SIZED POWDERS UNDER SOUND VIBRATION" in "The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering", Sang Done Kim,Korea Advanced Institute of Science and Technology, Korea; Yong Kang, Chungnam National University, Korea; Jea Keun Lee, Pukyong National University, Korea; Yong Chil Seo, Yonsei University, Korea Eds, ECI Symposium Series, (2010). http://dc.engconfintl.org/fluidization_xiii/65