Volume 10, Issue 40 (2013)
FSCT 2013, 10(40): 129-137 |
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Determination of rheological properties of grape molasses. FSCT 2013; 10 (40) :129-137
URL: http://fsct.modares.ac.ir/article-7-114-en.html
URL: http://fsct.modares.ac.ir/article-7-114-en.html
Abstract: (9515 Views)
Grape molasses is one of the famous by products of grape that more produced by traditional methods. In this research, some physicochemical properties of grape molasses such as SG, pH, total sugar, ash and rheological properties by using of a single cylinder rotary viscometer at three temperatures (25, 45 and 65oC) and three concentrations of 35, 50 and 76 were measured. Mathematical calculations in basis of Mitchka method shown that it is non-Newtonian and have dilatant behavior. Arrhenius model used for temperature dependence of consistency coefficient and activation energy calculated in range of 15.197 to 34.070 kJ/mol. Finally, by using of exponential relationship concentration dependence of consistency coefficient was evaluated.
Keywords: Rheological properties, Grape molasses, Oswald de wale model, Mitchka method, Activation energy
Received: 2011/06/3 | Accepted: 2012/08/3 | Published: 2013/07/23
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