Numerical investigation on freeze-drying of aqueous material frozen with pre-built pores

WeiWang; DapengHu; Yanqiu Pan; Guohua Chen

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Numerical investigation on freeze-drying of aqueous material frozen with pre-built pores

第25届中国过程控制会议专栏 | Updated：2026-01-06

- Numerical investigation on freeze-drying of aqueous material frozen with pre-built pores
- Numerical investigation on freeze-drying of aqueous material frozen with pre-built pores
- 中国化学工程学报（英文版） 2016年24卷第1期页码：116-125
- Affiliations：
  
  1. 2 Department of Chemical Engineering, Dalian University of Technology,Dalian,China,116024
  2. 3 Department of Chemical and Biomolecular Engineering, Hong Kong University of Science and Technology,Hong Kong,China
- Author bio：
- Funds：
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  中图分类号：
- 纸质出版：2016
- Accepted：
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WeiWang, DapengHu, Yanqiu Pan, 等. Numerical investigation on freeze-drying of aqueous material frozen with pre-built pores[J]. 中国化学工程学报（英文版）, 2016,24(1):116-125.

WeiWang, DapengHu, Yanqiu Pan, Guohua Chen. Numerical investigation on freeze-drying of aqueous material frozen with pre-built pores[J]. Chin.J.Chem.Eng., 2016, 24(1): 116-125.
WeiWang, DapengHu, Yanqiu Pan, 等. Numerical investigation on freeze-drying of aqueous material frozen with pre-built pores[J]. 中国化学工程学报（英文版）, 2016,24(1):116-125. DOI：

WeiWang, DapengHu, Yanqiu Pan, Guohua Chen. Numerical investigation on freeze-drying of aqueous material frozen with pre-built pores[J]. Chin.J.Chem.Eng., 2016, 24(1): 116-125. DOI：

摘要

Abstract

Freeze-drying of the initially porous frozen material with pre-built pores from liquid material was found experimentally to save drying time by over 30% with an initial saturation being 0.28 compared with the conventional operationwith the initial saturation being 1

usingmannitol as the solidmaterial. In order to understand themass and heat transfer phenomena of this novel process

a two-dimensional mathematical model of coupled mass and heat transfer was derived with reference to the cylindrical coordinate system. Three adsorption-desorption equilibrium relationships between the vapour pressure and saturation value namely

power-law

Redhead's style and Kelvin's style equation

were tested. Kelvin's style in exponential form of adsorption equilibrium relation gave an excellent agreement between the model prediction and experimental measurement when the equation parameter

of 5000 was applied. Analyses of temperature and ice saturation profiles show that additional heat needs to be supplied to increase the sample temperature in order to promote the desorption process. Simulation also shows that there is a threshold initial porosity after which the drying time decreased with the increase in the initial porosity. Enhanced freeze-drying is expected to be achieved by simultaneously enhancing mass and heat transfer of the process.

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