Pseudoplastic and viscoelastic behaviour of molasses

Leong, Y., McBain, G.D., Chu, S.Y., and Ong, B.C. (2001) Pseudoplastic and viscoelastic behaviour of molasses. Proceedings of the Australian Society of Sugar Cane Technologists, 23. pp. 341-345.

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Abstract

Low-grade C molasses exhibit unusually large jet swell. Some authors have attributed this behaviour to viscoelasticity. We will present rheometrical data which show that lowgrade molasses are indeed viscoelastic. Viscoelasticity exacerbates processing problems. Viscoelasticity is attributed to dissolved high Mw polymers such as dextran. Polymer molecules resist stretching and as a result in complex flow geometries the fluid avoids moving through small diameter channels or capillaries such as those found in a packed bed of sugar crystals. The viscosity behaviour of a C molasses was characterised over 5 decades of shear rate. It displayed Newtonian behaviour at low shear rates (~lO⁻⁴s⁻¹). For the C molasses at 49.4°C the flow behaviour index decreased to a minimum of about 0.2 at 0.02s⁻¹ and then increased back to 0.7 at the highest shear rate measured, 3s⁻¹.

Item ID: 13391
Item Type: Article (Refereed Research - C1)
Keywords: molasses; pseudoplasticity; temperature; viscoelasticity
ISSN: 0726-0822
Date Deposited: 04 Mar 2013 01:23
FoR Codes: 09 ENGINEERING > 0908 Food Sciences > 090805 Food Processing @ 100%
SEO Codes: 86 MANUFACTURING > 8601 Processed Food Products and Beverages (excl. Dairy Products) > 860199 Processed Food Products and Beverages (excl. Dairy Products) not elsewhere classified @ 100%
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