Researches on Vacuum Freeze-Drying
نویسندگان
چکیده
منابع مشابه
Distribution of Vapor Pressure in the Vacuum Freeze-Drying Equipment
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 and in the channel between plate groups. T...
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Today, sperm cryopreservation is a routine practice in infertility clinics. One of the alternative methods to preserve sperm is freeze-drying. This process consists of three steps. The first step is sample freezing, during which the solvent is separated from the solvent. Water forms ice crystals and the solute is placed between the ice crystals. Freezing may be done in a separate device or in a...
متن کاملOn the computer simulation of heat and mass transfer in vacuum freeze–drying
The paper is devoted to studying the problem of freeze– drying which is a process of the dehydrating frozen materials by sublimation under high vacuum. The mathematical and the computer models describing this process are presented. The discretizations used and the numerical treatment of the corresponding ordinary and partial differential equations is discussed. The results of some test experime...
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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. Irradiation, as a method of removing pathogens, lowers the antigenic acti...
متن کاملCirculating-Gas Freeze Drying
WAGMAN, JACK (U.S. Army Biological Laboratories, Frederick, Md.) AND EDWARD J. WENECK. Preservation of bacteria by circulating-gas freeze drying. Appl. Microbiol. 11:244-248. 1963.-Water-washed Serratia marcescens and Escherichia coli were freeze dried in a circulating-gas system at atmospheric pressure. This convective procedure resulted in a substantially higher survival of organisms than cou...
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ژورنال
عنوان ژورنال: Transactions of the Japan Society of Mechanical Engineers
سال: 1971
ISSN: 0029-0270,2185-9485
DOI: 10.1299/kikai1938.37.1387