Abstract
Vacuum drying technique is widely used in food a processing, pharmaceutical and other industry which needs to be calculated regularly. In order to establish temperature calibration method for vacuum drying oven, temperature profile needs to be studied. In this paper, a three-dimensional (3D) unsteady mathematical model has been developed to study heat transfer in a vacuum drying oven. Governing equations are discretized in implicit form by using the control volume method. PRESTO! scheme was used for the discretization of the pressure modified equation. SIMPLE algorithm is adopted to solve the coupling of pressure and velocity. The natural-convection flow forced by buoyancy force was numerically calculated based on Boussinesq assumption. Results of the model calculation showed that temperature distribution in the vacuum drying oven significantly changed when the pressure in the oven is close to vacuum. Temperature uniformity in the vacuum drying box increases with the increase of vacuum degree. It is not appropriate to directly investigate the temperature uniformity of the vacuum drying oven by using JJF 1101-2019. The results can be used to lay a theoretical foundation for the establishment of calibration method for vacuum drying oven.
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