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Modeling of Rheological Characteristics of “MalasYazdi” (Punicia granatum L.) Pomegranate Juice
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نویسنده
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Bodbodak S. ,Kashaninejad M. ,Hesari J. ,Razavi S. M. A.
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منبع
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journal of agricultural science and technology - 2013 - دوره : 15 - شماره : 5 - صفحه:961 -971
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چکیده
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Flow characteristics and rheological parameters of “malas yazdi” pomegranate(punica granatum l.) juice were investigated using rotational viscometer at differenttemperatures (10, 20, 30, 40, 50, 60 and 70°c) and concentrations (12, 22, 32, 42 and 52°brix). the experimental data had the best fitness with herschel-bulkley model and thevalues of flow behavior index (n) varied between 0.97 and 1.45 at all temperatures andconcentrations, revealing the shear thickening nature of pomegranate juice. theactivation energy of flow (ea) calculated with respect to apparent viscosity at 40 rpmincreased from 9.07 to 24.05 kj mol^-1 as the juice concentration increased from 12 to 52°brix. power equation indicated that consistency coefficient increased non-linearly withconcentration increase. a mathematical model was developed to describe the influence oftemperature and soluble solids on the consistency coefficient of pomegranate juice for thestudied conditions.
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کلیدواژه
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Apparent viscosity ,Consistency coefficient ,Pseudoplastic ,Shear-thickening
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آدرس
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gorgan university of agricultural sciences and natural resources, Department of Food Science and Technology, ایران, gorgan university of agricultural sciences and natural resources, Department of Food Science and Technology, ایران, university of tabriz, Faculty of Agriculture, Department of Food Science and Technology, ایران, ferdowsi university of mashhad, Department of Food Science and Technology, ایران
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Authors
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