真空科学与技术学报
真空科學與技術學報
진공과학여기술학보
JOURNAL OF VACUUM SCIENCE AND TECHNOLOGY
2009年
6期
619-623
,共5页
张世伟%张志军%鄂东梅%宋先霖%徐成海%刘军
張世偉%張誌軍%鄂東梅%宋先霖%徐成海%劉軍
장세위%장지군%악동매%송선림%서성해%류군
冷冻干燥%溶液真空冻结%模型%实验
冷凍榦燥%溶液真空凍結%模型%實驗
냉동간조%용액진공동결%모형%실험
Freeze-drying%Liquid vacuum freezing%Model%Experiment
简要介绍了液体物料真空蒸发冻结过程中出现的暴沸、过冷、冻结等实验现象.针对溶液由液相表面蒸发为汽相、由冻干室向冷阱室流动迁移、在冷凝器上凝结的全过程,从质量与能量守恒原理、热力学原理和气体动力学原理出发,建立了完整的数学模型,并以纯水为例进行了模拟计算.同时利用专门组建的实验装置,对纯水的真空蒸发冻结过程开展了实验观测研究,得到整个过程的质量、温度、压力-时间曲线.通过对比理论模拟计算和实验测试的结果,说明了所建立的动力学模型的正确性.
簡要介紹瞭液體物料真空蒸髮凍結過程中齣現的暴沸、過冷、凍結等實驗現象.針對溶液由液相錶麵蒸髮為汽相、由凍榦室嚮冷阱室流動遷移、在冷凝器上凝結的全過程,從質量與能量守恆原理、熱力學原理和氣體動力學原理齣髮,建立瞭完整的數學模型,併以純水為例進行瞭模擬計算.同時利用專門組建的實驗裝置,對純水的真空蒸髮凍結過程開展瞭實驗觀測研究,得到整箇過程的質量、溫度、壓力-時間麯線.通過對比理論模擬計算和實驗測試的結果,說明瞭所建立的動力學模型的正確性.
간요개소료액체물료진공증발동결과정중출현적폭비、과랭、동결등실험현상.침대용액유액상표면증발위기상、유동간실향랭정실류동천이、재냉응기상응결적전과정,종질량여능량수항원리、열역학원리화기체동역학원리출발,건립료완정적수학모형,병이순수위례진행료모의계산.동시이용전문조건적실험장치,대순수적진공증발동결과정개전료실험관측연구,득도정개과정적질량、온도、압력-시간곡선.통과대비이론모의계산화실험측시적결과,설명료소건립적동역학모형적정학성.
We addressed the complete thermal dynamic processes,such as the boiling,supper-cooling and freezing of liquid materials,in vacuum freezing.The processes,including the vaporization of the solution,its transport from the freeze-drying chamber to the condensation chamber,and its coagulation on the condenser,were modeled,based on the energy and mass conservation principle,as well as the thermodynamic and gas dynamic theories.The newly-developed physical model was tested witha simulation of pure water.In a dedicated setup,the realistic time evolutions of the mass,temperature and pressure were evaluated.The experimental data agree very well with the calculated results.