Computational fluid dynamic (CFD) modeling of simultaneous extraction and fermentation process in a single sugar beet cossette
Laboratory of Biochemical Engineering, Industrial Microbiology, Malting and Brewing Technology, Department of Biochemical Engineering, Faculty of Food Technology and Biotechnology, University of Zagreb, Zagreb, Croatia
Eurobiotech J 2017; 1: 18-26
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For simulations of flow and microbial conversion reactions, related to modeling of simultaneous extraction and fermentation process in a single sugar beet cossette a software package OpenFOAM was used. The mass transfer of the components (sucrose, glucose, fructose and ethanol) in the studied system was controlled by the convection and diffusion processes. Microbial conversion rates and yield coefficients were experimentally determined and/or estimated by mathematical simulation. Dimensions of the model sugar beet cossette (SBC) were: average length of cosettes 40.10 mm, average thickness 3.32 mm and average width 3.5 mm, and represented in the model as a square-shape cross-section cossette. The whole mesh domain was made of 32000 mesh cells and model sugar beet cossette was made up of 500 mesh cells. The finite volume method was used as a discretization scheme for calculations. The established CFD model was used to study the mass transfer and microbial conversion rates on the scale of single sugar beet cossette in the short time scales (up to 25 s). This model can be used for simulation of extractant flow around single sugar beet cossette as well as for description of simultaneous extraction and fermentation process in the studied system.