کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
591764 1453881 2016 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of loading history on visco-elastic potato starch gel
ترجمه فارسی عنوان
اثر تاریخ بارگذاری بر روی ژل نشاسته سیب زمینی ویسکوزو الاستیک
کلمات کلیدی
گسترش نشاسته ژلاتینی، ویسکو الاستیسیته، حساب عمومی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
چکیده انگلیسی


• A starch paste is subjected to squeeze flow.
• The sample retains memory of loading history.
• Complex modulus of the fluid on dynamic loading is also studied.
• The system is modelled as a visco-elastic three parameter solid.
• Generalised calculus is incorporated to reproduce observed oscillation in strain.

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 τ∼ seconds between the steps. The effect on the strain, of varying τ 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.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 492, 5 March 2016, Pages 47–53
نویسندگان
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