1. Proceedings
  2. I3M
  3. 2022
  4. FOODOPS
  5. 10.46354/i3m.2022.foodops.010

Performance assessment, through CFD simulation, of an ultraviolet reactor for the processing of fruit juices

  • a Roberto Montanari ,
  • b Andrea Volpi, 
  • c Federico Solari , 
  • d Natalya Lysova
  • a,b,c,d  University of Parma - Department of Engineering and Architecture, Viale delle Scienze 181/A, Parma, 43124, Italy
Cite as
Montanari R., Volpi A., Solari F., and Lysova N. (2022).,Performance assessment, through CFD simulation, of an ultraviolet reactor for the processing of fruit juices. Proceedings of the 8th International Food Operations and Processing Simulation Workshop (FoodOPS 2022). , 010 . DOI: https://doi.org/10.46354/i3m.2022.foodops.010
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Abstract

Computational Fluid Dynamics (CFD) was used to predict the performance of an ultraviolet reactor employed for the pasteurization of orange and pineapple fruit juices. The rheological characteristics of the juices were measured, as well as their absorption coefficient at 254 nm. A numerical simulation approach was used to compute both the flow field for 4 different flow rates (20, 40, 60 and 100 l/h) and the radiation field, generated using a commercial lamp. The possible trajectories and the correlated residence times of the particles and microorganisms flowing through the reactor were calculated using a discrete phase model (DPM). The dose absorbed was calculated by integrating over time the light intensity along each trajectory, and the performances were evaluated in terms of dose distribution (minimum, maximum and average dose). The approach adopted allowed also for evaluating the uniformity of the process and optimizing it, to avoid insufficient doses on some trajectories or excessive doses on others, with a consequent risk of re-contamination or formation of unwanted by-products, respectively. This represents a big advantage compared to most of the studies present in the literature, where the performances are assessed through experimental approaches, which do not allow for evaluating the uniformity of the treatment.

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