Drying Assisted by Power Ultrasound

Garda-Perez, J. V., Carcel, J. A., Benedito, J., Riera, E., Mulet, A., 2007. Influence of process variables on hot air drying assisted by power ultrasound. Proceedings of 19th International Confess on Acoustics, Madrid. 

De la Fuente, S, Mulet, A., 2006b. Effect of air temperature on convective drying assisted by high power ultrasound. Defect Difjus. Forum 258-260 563-574. 

A more detailed treatment of the application of ultrasound is provided in Chapter 8, along with a discussion of the principles of generation and transmission of ultrasound energy to the material to be treated. It is pointed out that power ultrasound can be used to assist both, liquid-solid processes, such as brine treatment, and drying. The acoustic field is shown to enhance, by a number of mechanisms, both, the external and the internal mass transfer when combined with hot air or atmospheric freeze drying of vegetables and fruits. The more porous the material, and the lower the permissible temperature and gas velocity, the higher is the intensification that can be reached by application of power ultrasound. 

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