目 录
中文摘要
ABSTRACT
第一章 绪 论 ...............................................................................................................1
§1.1 真空冷冻干燥的原理 ....................................................................................1
§1.2 真空冷冻干燥的发展与现状 ........................................................................1
§1.3 真空冷冻干燥的基本过程及应用 ................................................................2
§1.3.1 真空冷冻干燥主要过程 .....................................................................2
§1.3.2 真空冷冻干燥的应用 .........................................................................3
§1.4 冷冻干燥技术的要点和难点 ........................................................................3
§1.5 冷冻干燥数学模型的研究现状 ....................................................................4
§1.5.1 URIF 模型 ............................................................................................4
§1.5.2 非稳态模型 .........................................................................................5
§1.5.3 准稳态模型 .........................................................................................6
§1.6 模型求解方法的现状与展望 ........................................................................7
§1.6.1 解析解法 .............................................................................................7
§1.6.2 数值解法 .............................................................................................7
§1.6.3 模拟法及实验法 .................................................................................9
§1.7 本课题的研究目的及内容 ............................................................................9
第二章 香蕉的真空冷冻干燥实验 ...............................................................................11
§2.1 香蕉共晶点和共融点温度的测量 ..............................................................11
§2.1.1 测量所需材料及设备 .......................................................................11
§2.1.2 差示扫描量热仪结构及测量原理 ...................................................11
§2.1.3 实验步骤 ...........................................................................................13
§2.1.4 实验结果 ...........................................................................................13
§2.2 香蕉的冷冻干燥 ..........................................................................................15
§2.2.1 真空冷冻干燥机 ................................................................................15
§2.2.2 预冻温度、一次干燥温度、二次干燥温度和真空度的确定 ........17
§2.2.3 香蕉冷冻干燥实验步骤 ...................................................................17
§2.2.4 香蕉冷冻干燥实验分析 ...................................................................17
§2.3 本章小结 ......................................................................................................18
第三章 冻干香蕉参数测量 .........................................................................................19
§3.1 冻干香蕉导热系数的测量 ..........................................................................19
§3.1.1 热线法导热系数测量仪的原理 .......................................................19
§3.1.2 测试系统 ...........................................................................................20
§3.1.3 导热系数的测量 ..................................................................................22
§3.2 冻干香蕉比热容的测量 ..............................................................................23
§3.2.1 实验设备 ...........................................................................................23
§3.2.2 差示扫描量热仪比热容测量的原理 ................................................23
§3.2.3 标定 ...................................................................................................23
§3.2.4 差示扫描量热仪比热容测量的步骤 ...............................................24
§3.2.5 测量结果及分析 ...............................................................................24