Ali Syed Sadiq, Arsad Agus, Hossain S K Safdar, Asif Mohammad
Department of Chemical Engineering, King Faisal University, P.O. Box 380, Al-Ahsa 31982, Saudi Arabia.
UTM-MPRC Institute for Oil and Gas, School of Chemical and Energy Engg, Faculty of Engineering, Universiti Teknologi Malaysia, Johor Bahru 81310, Malaysia.
Nanomaterials (Basel). 2022 Apr 28;12(9):1509. doi: 10.3390/nano12091509.
The commercial utilization of bulk nanosilica is widespread in concrete, rubber and plastics, cosmetics and agriculture-related applications, and the market of this product is projected to exceed USD 5 billion by 2025. In this investigation, the local dynamics of a nanosilica bed, excited with sinusoidal acoustic waves of different frequencies, were carefully monitored using sensitive pressure transducers to obtain detailed insights into the effectiveness of sound waves as a means of energy transport inside the bed. The evolution of wave patterns and their frequency and power distributions were examined both in the freeboard and in the static bed. These results were compared with those obtained by using an empty column. The acoustic frequency strongly affected the signal power. The average power of the acoustic signal in the freeboard region was twice higher than that for the empty column, whereas the same (power) ratio decreased to approximately 0.03 inside the bed for 300 Hz. However, at 360 Hz, the power ratio was substantially lower at 0.24 and 0.002 for the freeboard and the granular bed, respectively, thereby indicating tremendous attenuation of acoustic waves in the granular media at all frequencies.
纳米二氧化硅粉体的商业应用在混凝土、橡胶、塑料、化妆品及农业相关领域广泛存在，预计到2025年该产品市场规模将超过50亿美元。在本研究中，使用灵敏的压力传感器仔细监测了由不同频率的正弦声波激发的纳米二氧化硅床层的局部动力学，以深入了解声波作为床层内部能量传输手段的有效性。在自由空域和静态床层中均考察了波形的演变及其频率和功率分布。将这些结果与使用空柱体获得的结果进行了比较。声频对信号功率有强烈影响。自由空域区域中声信号的平均功率比空柱体的平均功率高两倍，而对于300Hz，床层内部相同（功率）比降至约0.03。然而，在360Hz时，自由空域和颗粒床层的功率比分别大幅降低至0.24和0.002，从而表明在所有频率下颗粒介质中声波的巨大衰减。
