MODELAGEM MATEMÁTICA E PROPRIEDADES TERMODINÂMICAS DA SECAGEM CONVECTIVA DA POLPA DE TUCUMÃ (Astrocaryum aculeatum)
DOI:
https://doi.org/10.15628/holos.2022.13738Palavras-chave:
Fruta amazônica, desidratação, difusividadeResumo
A polpa de tucumã possui potencial para utilização industrial. Entretanto, o elevado conteúdo de umidade limita o seu uso. Assim, objetivou-se secar convectivamente a polpa de tucumã, a qual foi desidratada na espessura de 4 mm, nas temperaturas de 30, 40, 50 e 60 °C, com monitoramento da perda de umidade até equilíbrio higroscópico. Verificou-se que o aumento de temperatura reduziu os teores de umidade de equilíbrio. As taxas de secagem foram maiores em maiores temperaturas e teores de umidade. Os modelos de Dois termos (30 a 50 °C) e Midilli (60 °C) foram os mais adequados para descrever a secagem da amostra. Os coeficientes de difusão efetivos de umidade ficaram compreendidos entre 0,98 × 10-10 e 4,20 × 10-10 m2 s-1 e sua dependência com a temperatura foi descrita pela equação de Arrhenius, com energia de ativação de 42,15 kJ mol-1. As propriedades termodinâmicas evidenciaram um processo endergônica.
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