南美白对虾中短波红外干燥特性及模型拟合

Medium-short-wave infrared drying characteristics and model fitting of Penaeus vannamei

中文关键词:  南美白对虾  中短波红外干燥  干燥特性  干燥模型  有效水分扩散系数

英文关键词:Penaeus vannamei  medium-short-wave infrared drying  drying characteristics  drying model  effective moisture diffusion coefficient

中文摘要:

      目的 研究南美白对虾中短波红外干燥(medium-short-wave infrared drying, MSWID)特性及其干燥模型拟合。方法 在不同温度下(50、60、70℃)对南美白对虾进行干燥试验, 并以热风干燥(hot air drying, HAD)为对比。采用8种常用干燥模型对试验数据进行非线性回归拟合, 确定最佳干燥模型, 并对干燥模型进行验证。并进一步分析不同温度下南美白对虾有效水分扩散系数和干燥活化能。结果 南美白对虾MSWID过程中, 干燥温度对干燥过程影响显著, 提高干燥温度可提高干燥速率, 加快干燥进程。比较模型评价指标发现, Two-term exponential模型可以很好的拟合南美白对虾干燥数据, 模型预测值和试验值误差仅为2.09%, 可较准确的预测干燥过程中南美白对虾的水分变化规律。二阶多项式回归方程可预测水分比随干燥温度和时间的变化。随着干燥温度的升高, MSWID和热风干燥的有效水分扩散系数分别从2.3721×10?9 m2/s、2.3027×10?9 m2/s升高到3.4027×10?9 m2/s和3.1794×10?9 m2/s, 活化能分别为16.5703 kJ/mol和14.7839 kJ/mol。结论 MSWID干燥时间更短, 干燥速率更快。Two-term exponential模型可真实、准确地描述MSWID和HAD下南美白对虾的干燥过程。本研究可为南美白对虾MSWID干燥过程的预测和控制提供理论依据。

英文摘要:

      Objective To study the medium-short-wave infrared drying (MSWID) characteristics and model fitting for Penaeus vannamei. Methods The drying experiment of Penaeus vannamei was carried out at different temperatures (50, 60, 70℃), and hot air drying (HAD) was considered as a control, 8 kinds of commonly drying models were adopted to fit the experimental data by nonlinear regression to determine the optimal drying model which was verified by experimental data. The effective moisture diffusion coefficient (Deff) and drying activation energy of Penaeus vannamei at different drying temperatures were further analyzed. Results The drying temperature had a significant effect on the drying process of Penaeus vannamei, and increased drying temperature could increase the drying rate and speed up the drying process. Two-term exponential model fitted the drying data of Penaeus vannamei best by comparing the model evaluation indexes. The error between the predicted value and the experimental value was only 2.09%, indicating better prediction of the moisture variation during the drying process of Penaeus vannamei. The second order polynomial regression equation could be used to predicted the moisture ratio change caused by drying temperature and drying time. With the increase of drying temperature, the Deff of MSWID and HAD increased from 2.3721×10?9 m2/s and 2.3027×10?9 m2/s to 3.4027×10?9 m2/s and 3.1794×10?9 m2/s, respectively, and the activation energies were 16.5703 kJ/mol and 14.7839 kJ/mol, respectively. Conclusion MSWID has shorter drying time and faster drying rate. The Two-term exponential model can describe the drying process of Penaeus vannamei under MSWID and HAD accurately. This study can provide a theoretical basis for the prediction and control of Penaeus vannamei drying process under MSWID.