Effect of concentration and temperature on the thermal conductivity of frozen acerola pulp

Autores

  • Cristina Guimarães Pereira Universidade Federal de Lavras
  • Tales Márcio de Oliveira Giarola Universidade Federal de Lavras
  • Heloísa Helena de Siqueira Elias Universidade Federal de Lavras
  • Jaime Vilela Resende Universidade Federal de Lavras

DOI:

https://doi.org/10.5433/1679-0359.2015v36n1p187

Palavras-chave:

Frozen acerola pulp, Thermal conductivity, Hot wire probe, Theoretical model.

Resumo

The purpose of this work was the experimental determination of the thermal conductivity of acerola pulp at concentrations of 5.5, 7.5, 9.5, 11.5 and 13.5 °Brix and temperatures of 0, –5, –10, –15, –20, –25 and –30 °C. The methodology used involved a hot wire probe, and the experimental results were compared with values estimated by several theoretical models (series, parallel and Maxwell-Eucken models) to evaluate the error involved. We observed an influence both of the concentration and the temperature on the thermal conductivity of the pulp. An increase of the conductivity with a decrease in temperature and in the solids concentration was detected. We observed the greatest increases in the range of 0 to –10 °C. Linear and polynomial equations were adjusted for the direct determination of the thermal conductivity of the pulp in the range of temperature and concentration studied.

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Biografia do Autor

Cristina Guimarães Pereira, Universidade Federal de Lavras

Discente de Doutorado Ciência dos Alimentos, Universidade Federal de Lavras, UGLA, Lavras, MG, Brasil.

Tales Márcio de Oliveira Giarola, Universidade Federal de Lavras

Discente de Doutorado Ciência dos Alimentos, Universidade Federal de Lavras, UGLA, Lavras, MG, Brasil.

Heloísa Helena de Siqueira Elias, Universidade Federal de Lavras

Pós-doutoranda Ciência dos Alimentos, UFLA, Lavras, MG, Brasil.

Jaime Vilela Resende, Universidade Federal de Lavras

Prof. Dr. em Engenharia de Alimentos, UFLA, Lavras, MG, Brasil.

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Publicado

2015-02-26

Como Citar

Pereira, C. G., Giarola, T. M. de O., Elias, H. H. de S., & Resende, J. V. (2015). Effect of concentration and temperature on the thermal conductivity of frozen acerola pulp. Semina: Ciências Agrárias, 36(1), 187–202. https://doi.org/10.5433/1679-0359.2015v36n1p187

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