Fresh fruits and vegetables are continuously losing water by transpiration after harvest, which willbe accelerated at low humidity. Ultrasonic humidifying is an effective way for increasing thehumidity in storage area for fruits and vegetables. This research aims to better understandhumidification mechanism and characterize the effects of the ultrasonic humidifier parameters onthe size distribution of mists. High-speed camera was obtained to determine the optimal distancebetween diaphragm and water level, and a Laser particle size meter was employed to analyze thesize distribution of mists generated by ultrasonic humidifier. The results showed that the mediandiameter of mist volume (VMD) enlarged with water level increased, while observed the oppositeresults in the case of the number of ultrasonic atomizers. The application of fan reduced the size ofwater mist effectively compared to static state. Furthermore, with ventilation velocity increased, thesize of water mist decreased. The results of this research will be useful for improving the controlprecision of temperature and humidity in cold-chain environment.
展开▼
