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Schematic diagram of the contact ultrasound-assisted air dryer (a: the exterior of the dryer; b: the interior of the dryer; c: ultrasonic part). 1: air inlet, 2: electric fans to recycle hot air (not used in this investigation), 3: thermocouple, 4: vibrating plate driven by ultrasound transducers, 5: air outlet, 6: ultrasound generator; 7: electric fan to remove the heat generated by the ultrasound device, 8: control panel.
