Title: Optimization of the humidification of cold stores by pressurized water atomizers based on a multiscale CFD model
Authors: Delele, Mulugeta Admasu ×
Schenk, Ann
Tijskens, Engelbert
Ramon, Herman
Nicolai, Bart
Verboven, Pieter #
Issue Date: 2009
Publisher: Applied Science Publishers
Series Title: Journal of food engineering vol:91 pages:228-239
Abstract: Humidification during long-term cooled storage of fruits is being introduced into practice to prevent
excessive moisture loss and quality degradation. High pressure fogging is one of the few systems that
can be used in ultra low oxygen (ULO) storage rooms. For system design and optimization, a CFD based
multiscale model was used. At the smallest scale, the flow through stacked products in boxes was predicted
using a direct model that combined discrete element (DE)-CFD modelling. At larger scale, a loaded
cool room model that predicts the storage room air velocity, temperature and humidity distributions and
fate of the water droplets was developed. The loaded product was considered as a porous medium, where
the anisotropic loss coefficients were determined from a combined DE-CFD simulation. A Lagrangian particle
tracking multiphase flow model was used. An interval humidification of 1 min on and 15 min off
with a water pressure of 80 bar (3.59 L h1) for a ULO storage room at 1 C on average gave a relative
humidity of 96.3%. The amount of sprayed water deposited on the stack and room surfaces depend on
the application pressure and nozzle position and direction. Good agreement was found between measured
and predicted results.
ISSN: 0260-8774
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Division of Mechatronics, Biostatistics and Sensors (MeBioS)
× corresponding author
# (joint) last author

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