摘要
本研究选用了五指毛桃切片、五指毛桃段和五指毛桃须根三种不同形态的五指毛桃样品,分别测定其在40、50、60和70℃条件下的热风干燥特性,并计算不同时间的干基含水量、干燥速率。并结合经验干燥模型、Fick第二定律,Arrhenius方程等计算五指毛桃干燥过程的水分有效扩散系数Deff,活化能Ea及干燥特性回归方程,结果表明:在40~70℃条件下,五指毛桃切片、段和须根的水分有效扩散系数分别在0.4863×10^(-9)~1.6228×10^(-9)、2.0285×10^(-9)~4.0570×10^(-9)和0.1521×10^(-9)~0.2536×10^(-9)m2/s范围内;五指毛桃切片、段和须根的表观活化能分别为31.93、35.34和17.34 kJ/mol。在40~70℃热风干燥条件下,五指毛桃切片、段和须根符合指数模型,模型预测值与试验值拟合良好(R2分别为0.992、0.979和0.998)。该研究结果可为五指毛桃热风干燥参数的优化及实际干燥工艺提供参考。
In order to measure hot air drying characteristics and dynamics model of Ficus hirta Vahl.slices,Ficus hirta Vahl.segments and Ficus hirta Vahl.fibrous roots,the moisture content of dry basis and drying rate at different times were measured at 40,50,60 and 70℃,respectively.Combined with the empirical drying model,Fick's second law and Arrhenius equation,the water diffusion coefficient,activation energy Ea and the regression equation of drying characteristics were calculated.The results showed that the water diffusion coefficients of Ficus hirta Vahl.slices,segments and fibrous roots were 0.4863×10^(-9)~1.6228×10^(-9),2.0285×10^(-9)~4.0570×10^(-9)and 0.1521×10^(-9)~0.2536×10^(-9)m2/s,respectively,during 40~70℃.Apparent activation energies of Ficus hirta Vahl.slices,segments and fibrous roots were 31.93,35.34 and 17.34 kJ/mol,respectively.In this article,three drying models were compared,all of which had good fitting degree,and the index model was selected to describe the drying characteristics of Ficus hirta Vahl..Under the hot air drying condition of 40~70℃,the drying model expressions were MR(slice)=exp-(-0.057T2-1.697T-5×10-5)t,(R2=0.992);MR(segment)=exp-(-4.050×10-5T2+0.063T+5.750×10-5)t,(R2=0.979);MR(fibrous root)=exp-(-8.504×10-5T2-0.058T+6.750×10-5)t,(R2=0.998).it will provides technical guidance for drying process in practice.
作者
桂青
周立军
王秀全
黄坚雄
郑定华
潘剑
GUI Qing;ZHOU Lijun;WANG Xiuquan;HUANG Jianxiong;ZHENG Dinghua;PAN Jian(Rubber Research Institute,Chinese Academy of Tropical Agricultural Sciences,Research Center for Utilization of Under-forest Resources,Danzhou Investigation&Experiment Station of Tropical Crops,Ministry of Agriculture and Rural Affairs,P.R.China,Haikou 570100,China)
出处
《食品工业科技》
CAS
北大核心
2021年第8期58-63,共6页
Science and Technology of Food Industry
基金
海南省自然科学基金资助(编号219QN319)。
关键词
五指毛桃
热风干燥
干燥曲线
干燥模型
Ficus hirta Vahl.
hot air drying
drying curve
drying dynamics model
