食品科学2017，Vol.38Issue(7)：129-135,7.DOI:10.7506/spkx1002-6630-201707021
基于Weibull分布函数的超声强化热风干燥紫薯的干燥特性及过程模拟
Drying Characteristics and Process Simulation of Ultrasound-Assisted Hot Air Drying of Purple-Fleshed Sweet Potato Based on Weibull Distribution Model
摘要
Abstract
In order to explore the enhancing effect of ultrasound on hot air drying process,the drying characteristics and quality changes of purple-fleshed sweet potato in an ultrasound-assisted hot air dryer were investigated at different drying temperatures (40,50,60 and 70 ℃) and ultrasound powers (0,30 and 60 W).The Weibull distribution model was applied in the dynamic simulation of the drying process.The results showed that the increase in drying temperature and ultrasound power resulted in a significant reduction in drying time.The Weibull distribution model could fit the drying curves accurately under different drying conditions.Scale parameter (α) decreased in the range of 92.317 to 345.764 min with the increase in drying temperature and ultrasound power.Shape parameter (β) ranged from 0.817 to 1.032,indicating that the hot air drying of purple-fleshed sweet potato was controlled by internal diffusion resistance.The effective moisture diffusivity coefficient (Dcal) values increased in the range of 1.205 × 10-10 to 4.513 × 10-10 m2/s with the increase in drying temperature and ultrasound power.The activation energy decreased as ultrasound power increased.At the same ultrasound power,the contents of total phenolics and total flavonoids increased at first and then decreased with the increase in drying temperature.Both classes of compounds increased with the increase in ultrasound power at lower drying temperature,whereas the reverse trend was observed at higher drying temperature.Therefore,ultrasound-assisted hot air drying is an effective method to accelerate drying rate and simultaneously achieve better quality.关键词
紫薯/超声/热风干燥/干燥特性/Weibull分布函数Key words
purple-fleshed sweet potato/ultrasound/hot air drying/drying characteristics/Weibull distribution model分类
轻工纺织引用本文复制引用
孙悦,刘云宏,于慧春,李晓芳..基于Weibull分布函数的超声强化热风干燥紫薯的干燥特性及过程模拟[J].食品科学,2017,38(7):129-135,7.基金项目
国家自然科学基金委员会-河南省人民政府人才培养联合基金项目(U1404334) （U1404334）
公益性行业(农业)科研专项(201503239) （农业）
河南省高等学校青年骨干教师资助计划项目(2015GGJS-048) （2015GGJS-048）
