基于Weibull分布函数猕猴桃切片微波真空干燥过程模拟及应用  

Weibull Distribution for Modeling Microwave Vacuum Drying of Kiwifruit Slices and Its Application

作　　者：曾目成[1] 毕金峰[1] 陈芹芹[1] 刘璇[1] 吴昕烨[1] 焦艺[1] 

机构地区：[1]中国农业科学院农产品加工研究所农业部农产品加工综合性重点实验室,北京100193

出　　处：《中国食品学报》2015年第6期129-135,共7页Journal of Chinese Institute Of Food Science and Technology

基　　金：公益性行业(农业)科研专项(201303073);国家"十二五"科技支撑计划项目(2012BAD31B06)

摘　　要：为了探究Weibull分布函数中各参数的影响因素及其在干燥中的应用,以猕猴桃切片在不同的微波真空干燥功率（330,460,590W）、真空度（-50,-70,-90k Pa）条件下的干燥过程为研究对象,利用Weibull分布函数对其干燥动力学曲线进行模拟、分析,结果表明：Weibull分布函数能够很好地模拟猕猴桃切片微波真空干燥过程;尺度参数α与微波功率和真空度均有关,并且随着微波功率和真空度的升高而降低;而干燥变量对形状参数β的影响较小。通过计算求出干燥过程中的估算水分有效扩散系数,其值在3.45078×10-7~6.74613×10-7m2/s范围内随着微波功率和真空度的升高而增大;通过阿伦尼乌斯方程计算出真空度为-50,-70和-90 k Pa时,干燥的活化能分别为1.34701,1.49099和1.57108 W/g。本研究为Weibull分布函数在猕猴桃切片微波真空干燥技术提供了技术依据。In this study, the kiwifruit was selected as raw material to investigate the effect of drying conditions on the parameters of Weibull distribution and its application in drying technology. The experiment were conducted at different levels of microwave vacuum drying power （330,460,590 W） and vacuum pressure （-50,-70,-90 kPa）. The results showed that the Weibull distribution function was good in simulating the process of microwave vacuum drying of kiwifruit slices. The scale parameter （α） was found to be related with the drying power and vacuum pressure, and its value decreased with the increasing of the drying power and vacuum pressure. Moreover, it was observed that the drying conditions had little influence on the shape parameter （β）. The calculated moisture effective diffusivity （Dcd） of kiwifruit sampies were calculated to be in the range from 3.45078×10-7 to 6.74613×10-7 m2/s, which increased with increasing of the drying power and vacuum pressure. The activation energy determined from Arrhenius equation was 1.34701, 1.49099 and 1.57108 W.g-1 for -50, -70 and -90 kPa, respectively. This research provides technique foundation for the use of Weibull distribution in microwave vacuum drying of kiwifruit.

关 键 词：猕猴桃 微波真空干燥 干燥动力学 水分有效扩散系数 活化能 

分 类 号：TS255.36[轻工技术与工程—农产品加工及贮藏工程]