Abstract
Vacuum freezing has high freezing efficiency, fast cooling rate, and no special cold source is required, it can be easily carried out on general vacuum freeze-drying equipment. Nevertheless, it is difficult to accurately control the freezing temperature and cooling rate during vacuum freezing on traditional freeze-drying equipment. In order to control the freezing temperature and cooling rate, the mathematical model of vacuum freezing process is established by using the basic theory of phase change heat and mass transfer and the gas state equilibrium equation. The iterative method is used to calculate and simulate the relationship between the three controllable process parameters on the general freeze-drying equipment: evaporation area, pumping speed and liquid thickness with the freezing temperature and cooling rate. The experimental results obtained using the experimental equipment are largely consistent with the theoretical results. It provides a theoretical foundation for controlling the freezing temperature and cooling rate during the vacuum freezing process.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
