Results 1 to 10 of about 169 (166)
A STUDY OF VACUUM FREEZE-DRYING OF FROZEN WET PAPERS [PDF]
Drying Technology, 2001 Vacuum freeze-drying of frozen wet papers was investigated experimentally. A freeze-drying facility was built to study the process by monitoring the various physical parameters (pressure, sample temperature, heater temperature, water content of the sample and cold panel temperature). A simple phenomenological model was developed to explain experimental
Carapelle, Alain +2 more
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Distribution of Vapor Pressure in the Vacuum Freeze‐Drying Equipment [PDF]
Mathematical Problems in Engineering, 2012 In the big vacuum freeze‐drying equipment, the drying rate of materials is uneven at different positions. This phenomenon can be explained by the uneven distribution of vapor pressure in chamber during the freeze‐drying process. In this paper, a mathematical model is developed to describe the vapor flow in the passageways either between material plates
Shiwei Zhang, Jun Liu
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Researches on Vacuum Freeze-Drying
Bulletin of JSME, 1972 The rate of sublimation dehydration by the process of Vacuum freeze-drying was investigated after our former reports on the researches of sublimation of ice. Analyses of the temperature distribution in the sublimating materials by numerical methods and of the ideal drying-characteristics were presented. In the above analysis, the rate-determining steps
KATAYAMA, KOZO, HAYASHI, YUJIRO
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Study of vacuum and freeze drying of bee honey
Thermal Science, 2020 The aim of this research is to study the drying kinetics of vacuum-dried and freeze-dried bee honey produced from two different varieties: Sunflower honey (Helianthus Annuus L.) and Acacia honey (Robinia pseudo acacia L.). Vacuum drying treatments were carried out with the honey samples? initial temperatures of +25?C, ?20?C, and ?40?C.
Nebojsa Nedic +7 more
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Beyond freeze-drying of biologics: vacuum-foam drying and spray freeze-drying
Proceedings of 21th International Drying Symposium, 2018 The complexity of biotherapeutics in development continues to increase as our capability in discovery and recombinant technology improves. While safety and efficacy remain the two critical aspects of all therapeutics, ensuring adequate stability is a challenge.
Langford, A. +8 more
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Model of Mass and Heat Transfer during Vacuum Freeze‐Drying for Cornea [PDF]
Mathematical Problems in Engineering, 2012 Cornea is the important apparatus of organism, which has complex cell structure. Heat and mass transfer and thermal parameters during vacuum freeze‐drying of keeping corneal activity are studied. The freeze‐drying cornea experiments were operated in the homemade vacuum freeze dryer.
Zou, Huifen +5 more
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Research on the Application of Vacuum Freeze-drying Technology for Food
E3S Web of Conferences, 2023 Vacuum freeze-drying technology is the best way to preserve the quality of food at present, which can maintain the nutrition and flavor of food to the maximum extent. It has the characteristics of being green, convenient, and nutritious. This paper analyses the principle of vacuum freeze-drying technology and introduces its application in the ...
Li Guangpeng, Wang Qi, Zhou Hengchao
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Mathematical model of vacuum freeze-drying in the secondary drying [PDF]
JOURNAL OF ADVANCES IN CHEMISTRY, 2007 The freeze-drying process is a complex heat and mass transfer process virtually. The drying process of freeze-drying is not only the key stage which decides the success of freeze-drying, but also the most difficult stage to control. There are lots of papers about heat and mass transfer in vacuum freeze drying at home and abroad.
Xueli Qin, Xingli Jiao, Lihua Li, Hua Li
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The effect of vacuum freeze-drying and radiation on allogeneic aorta grafts
Molecular Medicine Reports, 2012 Vacuum freeze-dried aorta is a satisfactory material for blood vessel grafting. Previous studies have focused on immunity, however, vacuum freeze-drying is a complicated process of heat and mass transfer, and adopting a programmed cooling process may more completely preserve the mechanical properties of the blood vessels.
Qing, Cao +4 more
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Drying Behaviors of Mint Leaves in Vacuum Freeze Drying
El-Cezeri Fen ve Mühendislik Dergisi, 2020 In this study, the drying behavior of mint which is one of the medicinal plants in freeze-drying was investigated. The products were dried at three different temperatures (40, 50, 60oC) and three different pressures (30, 50, 80 kPa) in a freeze-drying system designed as a prototype. Drying time is decreased with increasing cabin pressure.
KOVACI, Tuğba +2 more
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