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|Título: ||Heat transfer and energy consumption in the freezing of guava pulp in large containers|
|Autor(es): ||Reno, M. J.|
Resende, J. V.
Peres, A. P.
Giarolla, T. M. O.
Prado, M. E. T.
|Assunto: ||Heat transfer|
Convective heat transfer coefficient
|Data de publicação: ||12-Out-2010|
|Referência: ||RENO, M. J. et al. Heat transfer and energy consumption in the freezing of guava pulp in large containers. Applied Thermal Engineering, Oxford, v. 31, n.4, p. 545-555, Mar. 2011.|
|Abstract: ||The heat transfer process, including the convective transfer coefficients (h), freezing times and power
consumption, was evaluated during the air blast freezing of 600 kg of guava pulp. Three packaging
configurations were tested: plastic boxes (34 L), buckets (20 L) and metal drums (200 L). The air velocity
inside the freezer tunnel was measured at several points, and sensors were installed to monitor the
temperature. The heat infiltration from external ambient air was also verified. Correlations of the Nusselt
number versus the Reynolds and Prandtl numbers were used to estimate the convective heat transfer
coefficients according to the configuration of the systems. The coefficients were applied to freezing-time
prediction models. The h values and consequent freezing time prediction were found to be more precise
for the packaging in the bucket configuration. For the drum configuration, the correlation that considered
the turbulence factor effects was found to be satisfactory. In the box configuration, the correlation
produced good results only for the boxes located in the central area of the stack. The results indicate that
the correlations may be applicable to the analysis and the differences explained by airflow and the
difficulty of maintaining constant heat flow on the surfaces.|
|Aparece nas coleções: ||DCA - Artigos publicados em periódicos|
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