摘要
为探索龙眼果肉微波真空干燥过程内部水分变化规律,采用Weibull分布函数建立龙眼干燥动力学模型,并对干燥动力学曲线进行拟合分析。干燥试验条件如下:微波功率为300、400、500W,真空度为280、230、180Pa。试验结果表明:Weibull分布函数拟合的龙眼果肉干燥曲线与试验曲线一致;尺度参数α随着微波功率增加、真空程度升高而减小;在微波真空单一干燥方法下,形状参数β变化不大;水分有效扩散系数的变化范围为4.8846×10-8~16.1217×10-8m^2/s;Weibull分布函数计算出在不同真空度280、230、180Pa下的干燥活化能分别为8.1813、8.1892、9.021W/g。
In order to investigate Peeled Longan’s moisture diffusion regulation and build the drying model.The Weibull distribution function was applied to the drying process under different levels of microwave power(300W,400W,500W)and vacuum pressure(280Pa,230Pa,180Pa)and the results were analyzed.The results demonstrated that the Weibull distribution function was good in simulating the process of microwave vacuum and compared with Fick’s second law.The scale parameter(α)was related to drying time and decreased as pressure increased.The shape parameter(β)was related to rate of the mass transfer at the beginning of drying,for the same drying method,drying parameters had little impact on the shape parameter(β).The moisture effective diffusivity of Peeled Longan were calculated to be in the range from 4.8846×10-8 m^2/s to 16.1217×10-8m^2/s;which increased with increasing of the microwave power and vacuum pressure.The activeation energy determined from Arrhenius equation was 8.1813,8.1892 and 9.021W/g for 280,230,180Pa,respectively.This research provides technique foundation for the use of Weibull distribution function in microwave vacuum drying of Peeled Longan.
作者
潘小莉
张帆
刘永富
汪磊
Pan Xiaoli;Zhang Fan;Liu Yongfu;Wang Lei(Yulin Normal University, Yulin 537000,China;Yulin Science and Technology Development Experimental Center, Yulin 537000,China)
出处
《农机化研究》
北大核心
2021年第4期179-184,共6页
Journal of Agricultural Mechanization Research
基金
国家自然科学基金项目(31960478)
玉林师范学院高层次人才科研启动基金项目(G2018003)
玉林师范学院校级科研项目(2018YJKY31)。
