Younes, Eliane, Himl, Michal, Stary, Zdenek, Bertola, Volfango 
ORCID: 0000-0001-5357-6191 and Burghelea, Teodor
(2020)
On the elusive nature of Carbopol gels: “model”, weakly thixotropic, or time-dependent viscoplastic materials?
Journal of Non-Newtonian Fluid Mechanics, 281.
p. 104315.
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Abstract
The question of whether Carbopol gels always behave as “model” yield stress material is addressed experimentally. Prompted by several simple hydrodynamic experiments performed with Carbopol gels that can not be fully understood within the commonly accepted “model” picture, we revisit the yielding behaviour of a Carbopol gel. When subjected to a loading/unloading process, the yielding of the Carbopol is gradual and exhibits a rheological hysteresis. By in-situ visualisation of the microstructure it is demonstrated that these features do not originate from a micro-structural damage of the micro-gel. A systematic description of the role of the rate at which the material is forced (loaded or unloaded) on the yielding scenario is given. In closing, the question of how simple a scalar model can be and yet accurately describe the experimentally observed yielding scenario of a Carbopol gel in a rheometric flow is addressed. It is concluded that simple scalar models may do such job as long as they are not too simple and include a minimal amount of physical ingredients.
| Item Type: | Article |
|---|---|
| Depositing User: | Symplectic Admin |
| Date Deposited: | 01 Jun 2020 08:52 |
| Last Modified: | 18 Jan 2023 23:50 |
| DOI: | 10.1016/j.jnnfm.2020.104315 |
| Related URLs: | |
| URI: | https://livrepository.liverpool.ac.uk/id/eprint/3089225 |
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