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Rheological Properties of Leucaena glauca Gum in Aqueous Solutions
Author(s) -
Raval D. K.,
Patel R. G.,
Patel V. S.
Publication year - 1988
Publication title -
starch ‐ stärke
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.62
H-Index - 82
eISSN - 1521-379X
pISSN - 0038-9056
DOI - 10.1002/star.19880400604
Subject(s) - shear thinning , rheology , viscometer , shear rate , aqueous solution , thermodynamics , materials science , viscosity , shear (geology) , simple shear , newtonian fluid , apparent viscosity , chemistry , composite material , organic chemistry , physics
The flow properties of Leucaena glauca gum solutions were studied in the range of shear rates 1.5 to 1310 s −1 , using a rotational viscometer Rheotest 2. The flow behaviour of aqueous solutions of the polysaccharide is pseudoplastic, and transition from Newtonian to pseudoplastic behaviour occurs in the low shear rate range at concentrations of interest to the industry. The flow of polysaccharide solutions is described by equation of state proposed by M. M. Cross . The basic rheological parameters, like zero shear rate viscosity (η o ), infinite shear rate viscosity (ηα) and a constant associated with the rupture of linkages (α) were calculated applying simple and established relations. The effect of concentration and temperature on rheological parameters have been studied. The Cross equation is found to be applicable to the data with a good degree of accuracy over a wide range of shear rates.