ass日本风韵熟妇pics男人扒开女人屁屁桶到爽|扒开胸露出奶头亲吻视频|邻居少妇的诱惑|人人妻在线播放|日日摸夜夜摸狠狠摸婷婷|制服 丝袜 人妻|激情熟妇中文字幕|看黄色欧美特一级|日本av人妻系列|高潮对白av,丰满岳妇乱熟妇之荡,日本丰满熟妇乱又伦,日韩欧美一区二区三区在线

In order to investigate the enhancing effect of contact ultrasound treatment on conventional heat pump drying, an ultrasound device was installed in the heat pump dryer, and contact ultrasound reinforced heat pump drying of apple slices was carried out to study the effects of ultrasound power, drying temperature and sample thickness on drying characteristics. The results showed that the internal mass transfer process of samples could be enhanced by putting samples on the ultrasound radiation board directly during heat pump drying. Drying time was shortened and drying rate was improved with the increases of ultrasound power and drying temperature and the decrease of sample thickness. The influence of ultrasound treatment on drying rate was decreased with the reduction of moisture content. Obviously strengthened effect of contact ultrasound on drying rate could be observed at low temperature and thin thickness, while it was reduced with the increases of drying temperature and thickness. The values of effective moisture diffusivity ( D eff ) ranged from 1.333×10 -10 m 2 /s to 1.651×10 -9 m 2 /s, and it was increased at high ultrasound power and drying temperature. After the contact ultrasound treatment, the numbers and sizes of the tiny holes inside apple slice were improved. With ultrasound power of 60 W, many micro-tunnels were even produced in the organizational structure of apple slices, which was also beneficial to enhance internal moisture diffusion. Therefore, contact ultrasound technology is an effective method to increase the drying rate of heat pump drying and shorten drying time obviously as well.