Experimental study on inlet turbulent flow under ultrasonic vibration: Pressure drop and heat transfer enhancement

The simultaneous effects of nanoparticles and ultrasonic vibration on inlet turbulent flow: An experimental study

Ultrasound technology has been successfully demonstrated for several food processing and preservation applications. The majority of food processing applications reported refer to liquid foods. Ultrasound has been applied to solid foods in some niche applications, e.g., tenderization of meat, mass transfer applications, and drying. Similar to any other technology, ultrasound also has some positive and negative effects on food quality depending on the application and processing conditions employed. This chapter outlines various applications of ultrasound to food and its effect on food and nutritional quality.

Effect of Ultrasound Technology on Food and Nutritional Quality.

Ultrasound (US) treatment coupled with membrane filtration has been utilized for membrane fouling control in water treatment; however, large-scale implementation of ultrasonic cleaning equipment appeared to be cost-prohibitive. In this study, a porous lead zirconate titanate (PZT) membrane is presented that enables in situ ultrasound generation by the application of an alternating voltage (AV) to mitigate fouling during oil-in-water (O/W) emulsion separation. We expect that this method is much more cost-effective because it is more direct, avoiding buildup of fouling and the need to take the membrane offline. Because the PZT membrane is hydrophilic, its underwater surface is oleophobic so that the accumulated oil droplets will have little affinity and hence can be removed easily by in situ-generated US. The effect of the in situ US generation on membrane fouling was investigated through variation in the excitation AV and its frequency, O/W emulsion pH, emulsified oil concentration, crossflow velocity, and transmembrane pressure. The results indicated that the in situ US generation resulted in a substantial decrease of fouling during the filtration process of O/W emulsions, whereas the membrane flux was maintained closely at its initial value.

Self-Cleaning Piezoelectric Membrane for Oil-in-Water Separation.

High frequency ultrasonic-assisted CO2 absorption in a high pressure water batch system

Intensification of heat and mass transfer by ultrasound: Application to heat exchangers and membrane separation processes

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Intensification of heat and mass transfer by ultrasound: Application to heat exchangers and membrane separation processes