Efeito da concentração e temperatura sobre a condutividade térmica da polpa de acerola congelada

Pereira, Cristina GuimarãesGiarola, Tales Márcio de OliveiraElias, Heloísa Helena de SiqueiraResende, Jaime Vilela

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.(AU)

1. Frozen acerola pulp
2. Theoretical model
3. Hot wire probe
4. sonda de fio quente
5. condutividade térmica
6. Thermal conductivity
7. modelo teórico
8. Polpa congelada de acerola