ajnowak's blog

Publication in the Journal of Food Engineering

The following work was published in the Journal of Food Engineering:

Edyta Piechnik, J. Smolka, M. Palacz, I. Tolstorebrov, T. M. Eikevik, M. Stebel, M. Haida, A. J. Nowak, A. Ciesielska, J. Bodys, Experimentally validated CFD-tool for a freezing simulation in a small-scale freeze-dryer, Journal of Food Engineering, 2023, 111888, ISSN 0260-8774, https://doi.org/10.1016/j.jfoodeng.2023.111888

Construction of a freeze dryer chamber equipped with microwaves

Because of the very limited space inside the chamber of the freeze dryer equipped with microwaves, and the resulting difficult assembly work of individual elements, all shelf holders were connected using flat bars. In this way, only these flat bars are attached to the side walls, and not each shelf separately.

Preparation of labs for tests of the freeze dryer equipped with microwaves

Final tests of the freeze dryer equipped with microwaves will be carried out in labs of SINTEF. For safety reasons the freeze dryer will placed inside protection sleeve equipped with sealing and quick release lock.

The protection sleeve will also be equipped with a side extraction and ventilation duct where gasses can be evacuated.

Simulation of the lyophilisation process

Based on the geometric model of the computational domain shown in the figure below

a simulation model of the lyophilisation  process is currently being developed. The computer code generated in the Matlab package is then coupled (at each time step) with the code generated in the Ansys / Fluent package. The obtained numerical results are also compared with the results of thermal measurements.