Performance test and numerical optimization of the golden Pomfret quick freezer

[摘要] Liquid nitrogen (LN2) quick freezer could make full use of most of latent heat and sensible heat of LN2 to freeze food. Pomfret is prone to spoilage, which could be quickly frozen by LN2 quick freezer after harvesting. In this paper, a LN2 quick-freezer is designed to freeze the golden Pomfret by the cold N2 at-80° C and 1.5m/s. Test results of temperature field and velocity field show there is a good temperature uniformity in the freezer, and the velocity field can be more uniform and stable when a top baffle is adopted. The velocity field in the freezer is studied by CFD simulation with different deflectors installed at the top of the freezer. Simulation results show that most of the field have a uniform air volume with the arc deflectors, which can meet the requirements of the golden Pomfret quick freezing.

[发布机构] Chinese Academy of Sciences Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Beijing; 100190, China^1;University of Chinese Academy of Sciences, Beijing; 100049, China^2

[关键词] Air volumes;CFD simulations;Numerical optimizations;Performance tests;Sensible heat;Temperature uniformity;Velocity field