期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 492, 期 -, 页码 47-53出版社
ELSEVIER
DOI: 10.1016/j.colsurfa.2015.12.007
关键词
Spreading; Gelatinised starch; Visco-elasticity; Generalised calculus
资金
- DST, Govt. of India [SR/S2/CMP-127/2012]
In this work gelatinised potato starch is shown to retain the memory of past loading history. It exhibits a visco-elastic response which does not depend solely on instantaneous conditions. A simple squeeze flow experiment is performed, where loading is done in two steps with a time lag tau similar to seconds between the steps. The effect on the strain, of varying 7 is reproduced by a three element visco-elastic solid model. Complexity is introduced through a generalised calculus approach by incorporating a non -integer order time derivative in the viscosity equation. A strain hardening proportional to the time lag between the two loading steps is also incorporated. This model reproduces the three salient features observed in the experiment, namely - the memory effect, slight initial oscillations in the strain as well as the long-time solid-like response. Dynamic visco-elasticity of the sample is also reported. (C) 2015 Elsevier B.V. All rights reserved.
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