CAJ | 학술논문

纸张干燥过程涉及到多孔介质的热质传递,如何确定质量扩散系数是所建立的多孔物料湿分扩散模型能否进行数值计算的关键.按Liukov公式将湿分扩散系数视为含湿质量分数的非线性函数,在恒温下进行纸张干燥实验,通过比较湿分蒸发质量的测量值与理论计算值,采用多变量寻优的方法对多孔介质一维情况下的湿分扩散系数进行估算,得到了实验条件下的纸张湿分扩散系数的计算公式.并进一步确定了纸张中的湿分扩散系数与含湿质量分数和温度之间的函数关系式.
지장간조과정섭급도다공개질적열질전체,여하학정질량확산계수시소건립적다공물료습분확산모형능부진행수치계산적관건.안Liukov공식장습분확산계수시위함습질량분수적비선성함수,재항온하진행지장간조실험,통과비교습분증발질량적측량치여이론계산치,채용다변량심우적방법대다공개질일유정황하적습분확산계수진행고산,득도료실험조건하적지장습분확산계수적계산공식.병진일보학정료지장중적습분확산계수여함습질량분수화온도지간적함수관계식.
Paper drying involves heat and mass transfer in porous media. How to precisely determine the moist diffusion coefficient is very important when the moist transfer theoretical models of porous media are numerically calculated. Paper drying test was done under isothermal conditions. The moisture diffusion coefficient is a non-linear function of the moisture mass fraction as described by Liukov. One method of parameter estimation for porous media at one-dimension involving moisture transfer in paper drying process was presented by adopting multivariable optimization method and comparing calculated moisture evaporation amount with measured ones. The calculation equation of moist diffusion coefficient under experimental condition was found. The relation between moisture diffusion coefficient, moisture mass fraction and temperature in paper sheets was also determined.