SOUSA, E. P.; http://lattes.cnpq.br/1113711276098324; SOUSA, Elisabete Piancó de.
Resumen:
Despite the high economic potential of pequi, there are still few studies related to
its physical properties for industrial purposes. This paper aimed at studying the physical
properties of the pequi pulp with different moisture contents (55, 60, 65 and 70%):
rheology, specific heat, thermal conductivity and diffusivity. The rheometry was
performed on a Brookfield viscometer; the specific heat in a mixture calorimeter, the
thermal diffusivity by using the Dickerson cylinder method and the thermal conductivity
by KD-device 2. The rheological data were fitted by Sisko, Ostwald-de-Waelle, Casson,
I lerschcl-Bulkley, Mizrahi-Berk and Vocadlo models with coefficients of determination
(R~) greater than 0.90 and average percentage deviations (P) less than 10%. the best fits
were performed by Mizrahi-Eierk model. The pequi pulps with moisture contents of 55, 60,
65 and 70% tended to decrease in apparent viscosity with increasing rotational speed
behave as non-newtonian fluids with pseudoplastic characteristics. The specific heat
tended to increase with increasing temperature and moisture content of the pulp. The
thermal diffusivity of the pequi pulp increased with increasing moisture content; also the
thermal conductivity of the pulp did not show a definite trend with increasing water
content and temperature of the pulps investigated.