摘要
根据斐克定律和质量守恒原理,建立了可以预测干燥过程中苜蓿茎秆内部水分分布的常压热风干燥的传质数学模型。通过对扩散模型边界条件的处理,结合紫花苜蓿茎秆内部水分扩散的干燥试验结果,采用数值模拟方法确定了干燥苜蓿茎秆的传质系数。结果表明,干燥苜蓿样本的含水率与模拟分析含水率的决定系数为R2=0.927,模拟分析具有较高的准确度。在此基础上进行的苜蓿茎秆内部水分分布的模拟计算保证了与苜蓿非稳态干燥过程的一致性。
According to Fick＇s law and principle of mass conservation, mass transfer model for convective airflow drying of alfalfa was established for forecasting moisture distribution inside alfalfa stem. Through boundary condition treatment of diffusion model and combination of experiment results of moisture diffusion inside alfalfa stem, moisture diffusion coefficient was calculated by using the method of numerical simulation. The result showed that determination coefficient on experimental data with simulation results was 0. 927, which indicated that simulation had higher accuracy. Moisture diffusion simulation inside alfalfa stern was in accordance with non-steady drying procedure.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2007年第5期27-31,共5页
Transactions of the Chinese Society of Agricultural Engineering
基金
黑龙江省教育厅重点攻关项目(10511200710551228)
关键词
常压热风干燥
苜蓿茎秆
传质模型
数值模拟
convective airflow drying
alfalfa stem
mass transfer model
numerical simulation
