Mathematical modeling of drying characteristics of Jew’s mallow(Corchorus olitorius)leaves  

作　　者：Adewale Olusegun Omolola Patrick Francis Kapila Henry Mbitha Silungwe 

机构地区：[1]Department of Agricultural&Rural Engineering,School of Agriculture,University of Venda,Private Bag X5050,Thohoyandou 0950,South Africa [2]Department of Food Science&Technology,School of Agriculture,University of Venda,Private Bag X5050,Thohoyandou 0950,South Africa

出　　处：《Information Processing in Agriculture》2019年第1期109-115,共7页农业信息处理（英文）

摘　　要：Drying behaviour of Jew’s mallow leaves using an oven dryer was studied.The influence of drying temperatures(50,60 and 70
C)on moisture content of the leaves at stable air velocity was considered.Five drying models,including,simple exponential,Page,Two-term exponential,Logarithmic,and Wang and Singh were fitted to drying data.Two-term exponential model adequately express the drying behaviour of Jew’s mallow leaves.Effective moisture diffusivity of Jew’s mallow leaves ranged from 8.18×10^-8 to 1.13×10^-7m^2/s.Dependence of the computed effective diffusivity on oven temperature was obvious.The energy required for oven drying of Jew’s mallow leaves was found to be 14.84 kJ/mol.The L^*,a^*,b^*,DE,a^*/b^*colour characteristics of the dried leaves range from 31.8 to 32.87,-3.73 to-4.37,13.6 to 16.47,69.00 to 69.73,and-0.26 to-0.34 respectively.Oven drying conditions of 50℃150 min and 70℃90min resulted to dried leaves with desirable colour characteristics.

关 键 词：Jew’s mallow Oven drying Mathematical modeling COLOUR Effective diffusivity Activation energy 

分 类 号：TG1[金属学及工艺—金属学]