摘要
目的基于Dincer模型探究不同干燥方式下光皮木瓜的干燥特性,为应用Dincer模型分析中药干燥传热传质过程及筛选适宜的光皮木瓜干燥技术和工艺提供理论依据。方法采用气体射流冲击、中短波红外和真空脉动干燥技术干燥厚度为12 mm的光皮木瓜切片,采用气体射流冲击干燥9、12、15 mm厚度的光皮木瓜切片,研究其干燥特性并测定干燥后的色泽、维生素C(VC)、总黄酮、复水比和微观结构。结果相同干燥温度下,3种干燥技术干燥速率从大到小分别为气体射流冲击、中短波红外及真空脉动干燥技术,对应干燥活化能(Ea)为43.10、36.95、20.37 kJ/mol;减小切片厚度有助于提高干燥效率。Weibull分布函数模拟结果表明,不同干燥条件下的尺度参数α为47.85~324.51,α越小干燥时间越短,气体射流冲击和中短波红外干燥形状参数β在0.8599~0.9806,说明干燥为内部水分扩散控制的降速干燥过程,而真空脉动干燥条件下β介于1.2187~1.2908,说明干燥受内部水分扩散和表面水分蒸发所共同主导;估算水分扩散系数(Dcal)在1.66×10^-8~1.13×10^-7 m^2/s,随着α值的增大而减小。Dincer模型分析干燥特性表明,不同干燥条件下滞后因子(G)为1.1356~1.3376,说明干燥初期均有短暂的升速干燥过程;传热毕渥数(Bi)值在1.1714~136.0412,且随着干燥温度的升高而减小,水分有效扩散系数(Deff)在3.26×10^-9~6.33×10^-8 m^2/s,相同干燥温度下D^*eff<Deff<Dcal;传质系数(k)为9.02×10^-6~8.82×10^-5 m/s,随着干燥温度的升高而增大。气体射流冲击干燥适合于光皮木瓜片的干燥加工,在实验参数范围内,干燥温度60℃、切片厚度12 mm为最优干燥工艺,干燥时间为5 h、明亮度L^*为62.80±1.70、色差值ΔE为19.62±2.60、VC和黄酮质量分数分别为(1.1078±0.0050)mg/g和(36.74±0.60)mg/g、复水比为7.11±0.24。结论该研究可为应用Dincer模型在中药干燥过程分析传热传质特性及筛�
Objective Based on Dincer model,the drying characteristic of Chaenomeles sinensis under different drying condition was investigated in order to provide theoretical foundation for applying Dincer model to analyze heat and mass transfer during Chinese herbs drying process and select suitable drying technology and process.Methods C.sinensis slice of thickness 12 mm was dried by the three different drying methods,namely air impingement drying,medium and short infrared waved drying and pulsed vacuum drying.Also,9,12 and 15 mm C.sinensis slices were dried under air impingement drying method.The drying characteristic,color value,rehydration ration,vitamin C(VC),general flavone,and microstructure were studied.Results At the same drying temperature,the drying rate sorted in order of size was air impingement drying,medium and short infrared waved drying and pulsed vacuum drying and the drying activation energy was 43.10,36.95 and 20.37 kJ/mol in corresponding.Decreasing slice thickness enhanced drying rate.The Weibull distribution model simulation result showed that the scale parameterαranged from 47.85 to 324.51.Smallerαvalue meant short drying time.The shape parameterβwas between 1.2187 and 1.2908 under air impingement drying as well as medium and short infrared waved drying method,which showed that drying was falling rate process controlled by internal moisture diffusion.However,the shape parameterβwas between 1.2187 and 1.2908 under pulsed vacuum drying method,which illustrated that drying was controlled both by internal moisture diffusion and surface moisture evaporation.The calculated moisture diffusion coefficient was ranged from(1.66×10-8)to(1.13×10-7)m2/s and decreased asαincreased.The Dincer model simulation result showed that the lag factor(G)was range from 1.1356 to 1.3376,which declared that there was a short raising rate drying period during the initial drying process.Heat transfer Biot number(Bi)value was between 1.1714 and 136.0412 and decreased as drying temperature increased.Effective moisture diff
作者
巨浩羽
赵海燕
张菊
张卫鹏
于贤龙
王吉强
高振江
肖红伟
JU Hao-yu;ZHAO Hai-yan;ZHANG Ju;ZHANG Wei-peng;YU Xian-long;WANG Ji-qiang;GAO Zhen-jiang;XIAO Hong-wei(College of Bioscience and Engineering,HebeiUniversity of Economics and Business,Shijiazhuang 050061,China;College of Business Administration,Hebei University of Economics and Business,Shijiazhuang 050061,China;College of Artificial Intelligence,Beijing Technology and Business University,Beijing 100048,China;College of Enginecring,China Agricultural University,Beijing 100083,China)
出处
《中草药》
CAS
CSCD
北大核心
2020年第15期3911-3921,共11页
Chinese Traditional and Herbal Drugs
基金
河北省自然科学基金资助项目(C2020207004)
北京市自然科学基金(6204035)
北京市教委组织部优秀人才项目(2018000020124G034)。
关键词
光皮木瓜
干燥
干燥特性
Weibull分布函数
Dincer模型
气体射流冲击干燥
中短波红外干燥
真空脉动干燥
色泽
维生素C
总黄酮
复水比
微观结构
活化能
内部水分扩散
表面水分蒸发
Chaenomeles sinensis(Thouin)Koehne
drying
drying characteristic
Weibull distribution model
Dincer model
air impingement drying
medium and short infrared waved drying
pulsed vacuum drying
color value
vitamin C
general flavone
rehydration ration
microstructure
activation energy
internal moisture diffusion
surface moisture evaporation
