RHEOLOGICAL CHARACTERIZATION OF SUSPENSIONS OF SUCROSE CRYSTALS IN SATURATED SUCROSE SOLUTIONS

Autor(es)

De Souza, Ana Cristina ^[1] ; Telis-Romero, Javier ^[1] ; Nicoletti Telis, Vania Regina ^[1]

Afiliação do(s) autor(es)

^[1] UNESP, Dept Engn & Tecnol Alimentos, BR-15054000 Sao Jose Do Rio Preto, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF FOOD PROCESS ENGINEERING; v. 33, n. 6, p. 992-1009, DEC 2010.
• Citações Web of Science: 0

Resumo

Suspensions formed by saturated sucrose solutions were analyzed at different temperatures (0 <= T <= 65C) and with different added fractions (0.005 <= phi <= 0.40) of known size sucrose crystals (0.163 <= d(p) <= 1.26 mm). Saturated sucrose solutions, taken as the suspension dispersant mean, were rheologically characterized using a concentric-cylinder rheometer and showed Newtonian behavior. The crystal suspensions were rheologically evaluated by using a mixer-type rheometer constituting an anchor impeller coupled to a rotational rheometer, also known as a mixer-type rheometer. The studied crystal suspensions also showed Newtonian behavior. Theoretical and semiempirical models were used to describe the correlation between suspension relative viscosity and crystal volumetric fraction. The best results were obtained using the Krieger and Dougherty, and the Mooney model, resulting in values of intrinsic viscosity, (eta), and maximum packing fraction, phi(m), compatible with data reported for coarse concentrated suspensions of nonspherical particles. (AU)

• Processo FAPESP: 02/06838-1 - Encapsulacao de sucos de frutas por co-cristalizacao com sacarose.
• Beneficiário: Vânia Regina Nicoletti Telis
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 03/05802-6 - Cinetica de co-cristalizacao de suco de maracuja com sacarose a partir de medidas reologicas em tempo real.
• Beneficiário: Ana Cristina de Souza
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 04/12620-4 - Caracterizacao reologica de suspensoes de cristais de sacarose em solucoes aquosas saturadas de sacarose.
• Beneficiário: Ana Cristina de Souza
• Modalidade de apoio: Bolsas no Brasil - Mestrado