Heat transfer analyses using computational fluid dynamics in the air blast freezing of guava pulp in large containers

Brazilian Journal of Chemical Engineering. 2013;30(4):811-824 DOI 10.1590/S0104-66322013000400013


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Journal Title: Brazilian Journal of Chemical Engineering

ISSN: 0104-6632 (Print); 1678-4383 (Online)

Publisher: Brazilian Society of Chemical Engineering

LCC Subject Category: Technology: Chemical technology: Chemical engineering

Country of publisher: Brazil

Language of fulltext: English

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W. M. Okita (Universidade Federal de Lavras)
M. J. Reno (Universidade Federal de Lavras)
A. P. Peres (Universidade Federal de Lavras)
J. V. Resende (Universidade Federal de Lavras)


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Time From Submission to Publication: 12 weeks


Abstract | Full Text

Heat transfer during the freezing of guava pulp conditioned in large containers such as in stacked boxes (34 L) and buckets (20 L) and unstacked drums (200 L) is discussed. The air velocities across the cross-section of the tunnel were measured, and the values in the outlet of the evaporator were used as the initial conditions in computational fluid dynamics (CFD) simulations. The model tested was turbulent standard k-ε. The CFD-generated convective heat transfer coefficients were mapped on the surfaces for each configuration and used in procedures for the calculation of freezing-time estimates. These estimates were compared with the experimental results for validation. The results showed that CFD determined representative coefficients and produced good correlations between the predicted and experimental values when applied to the freezing-time estimates for the box and drum configurations. The errors depended on the configuration and the adopted mesh (3-D grid) construction.