Abstract
The use of ultrasonic power in the regeneration of silica gel may be very promising because it helps to improve the regeneration efficiency at the lower regeneration temperature. This work is to study experimentally the effects of ultrasonic power and frequency on the regeneration of silica gel using the ultrasound at different regeneration temperatures (i.e., 45, 55, 65, and 75 °C). Three kinds of frequencies (i.e., 21, 26, and 35 kHz) combined with different power (i.e., 0, 20, 40, and 60 W) of ultrasound were employed to perform the experiments. The moisture change in the silica gel during the ultrasonic regeneration was modeled by the Page equation, and the effective moisture diffusivity was estimated through the diffusion equation that is based on the Fick’s second law. Three parameters, including the enhanced rate (ER) of regeneration, the conditioned regeneration time (CRT), and the energy-saving rate (ESR), are suggested to evaluate the effect of ultrasonic power and frequency on the regeneration....
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