魔芋气体射流冲击干燥特性及干燥模型  被引量:2

Air impingement drying characteristics and drying model of konjac

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作  者:冯亚运 崔田田[1] 张宝善[1] 张百忍 

机构地区:[1]陕西师范大学食品工程与营养科学学院,陕西西安710119 [2]陕西省安康市农科所,陕西安康725021

出  处:《陕西师范大学学报(自然科学版)》2016年第1期118-124,共7页Journal of Shaanxi Normal University:Natural Science Edition

基  金:科技部农业科技成果转化项目(2011GB23600017);西安市科技局项目(CXY1129);陕西省农业科技创新与攻关项目(2015NY009)

摘  要:为探究魔芋干燥特性,提高魔芋干制品质和效率,将气体射流冲击干燥技术应用于魔芋片的干燥,研究其在切片厚度(3~5mm)、风温(70~100℃)和风速(10~13m/s)条件下的干燥曲线、干燥速率曲线、水分有效扩散系数以及干燥活化能,建立气体射流干燥魔芋片的最适数学模型。研究表明:整个干燥过程属于降速干燥,水分有效扩散系数在1_2323×10-9~2.2178×10-9m3/s范围内随着切片厚度、风温和风速的增加而增加。利用阿伦尼乌斯公式求出魔芋片的干燥活化能为6.001kJ/mol。通过决定系数(R^2)、卡方检验值(χ^2)和均方根误差(ERMs)等拟合优度评价指标对各种干燥模型进行拟合比较,HendersonandPabis模型能很好地预测魔芋片气体射流冲击干燥过程中的水分比变化规律。In order to explore the characteristic variation and improve the quality and efficiency during the processes of konjac drying,drying characteristics of konjac treated by air impingement drier is studied. Konjac is dried under the conditions of slice thickness(3~5 mm) ,air temperature (70~100 ℃) and air velocity(10~13 m/s) to obtain the drying curves, drying mate curves,the available moisture diffusion coefficient and drying activation energy. A mathematical model of air impingement drying konjac is obtained, and the whole process of dying is the falling-rate mode, The available moisture diffusion coefficient is rising with the growth of the slice thickness, air temperature and air velocity in the range of 1. 232 3 ;K 10-9 ~2. 217 8× 10 9 m2/s. The drying activation energy(E.) is calculated to be 6. 601 kJ/mol according to Arrhenius formula. According to the statistical parameters such as the correlation coefficient(R2) .X2 and root mean square error (ERMs), the Henderson and Pabis model can well predict the moisture change law during konjac process by air-impingement drying.

关 键 词:魔芋 干燥 模型 水分有效扩散系数 干燥活化能 气体射流冲击干燥 

分 类 号:S375[农业科学—农产品加工]

 

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