MUNIZ, M. B.; http://lattes.cnpq.br/6333963543499533; MUNIZ, Marcelo Barbosa.
Abstract:
The present work had as objective to determine some chemical characteristics (insoluble
solids, humidity, ashes, total solids, vitamin C, pH, total, acidity), Theological behavior and
termophysical properties (specific heat, specific mass, diffusivity and thermal
conductivity) of the pulp of the bacuri (Platonia insignis Mart.) in concentrations of 5,7,5,
10, 12,5, 15, 17,5, 20°B. For the determination reological, in triplicata were used the
temperatures of 10, 20, 30 40 50 and 60°C, with the use of the viscosimeter Brookfield,
model RVT, with geometry of concentric cylinder. The experimental values were used to
adjusted to the models of the Potency Law or Ostwald-of-Waele, Herschel-Bulkley and
Mizrahi Berk, where the best adjusted model of Herschel-Bulkley was described. All
samples presented behavior non - newtoniano. For the termophysical properties the
specific heat, was obtained using the mixture calorimeter, with a value between the
smallest and larger concentration from 3.616 to 2.986 kJ/kg°C, observing with this, a
decrease in the increase of the concentration; with relationship to the values of the specific
mass, was certain through the pycnometers of 25 ml, for temperatures of 25 and 30°C, in
sextuplicate, varying 1009.948 respectively to 1048.358 kg/m3 and 1008.399 and 1044.438
Kg/m3, observing an increase according to the temperature increment, for the obtaining of
the diffusivity, the methodology of was used DICKERSON (1965), and observed values
reduce with the increase of the concentration, accordingly, 5°B, 1.787 x 10 "7 to 20°B 1.637
x 10"7; the thermal conductivity was calculated above through the determinations
termophysical above-mentioned and it also reduced accordingly the increase of
concentration 5°B 0.643 to 20°B 0.500 (W/m°C).
