Numerical Simulations of the Flow of a Dense Suspension Exhibiting Yield-Stress and Shear-Thinning Effects
| Autor: | Wei-Tao Wu, Mehrdad Massoudi, Meng-Ge Li, Feng Feng |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Thixotropy
Control and Optimization Yield (engineering) Materials science 020209 energy suspension shear-thinning fluids dense suspension yield stress non-Newtonian Flow (psychology) Energy Engineering and Power Technology 02 engineering and technology 01 natural sciences lcsh:Technology Physics::Fluid Dynamics Viscosity symbols.namesake Rheology 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Electrical and Electronic Engineering Engineering (miscellaneous) Shear thinning 010304 chemical physics Renewable Energy Sustainability and the Environment lcsh:T Reynolds number Mechanics Non-Newtonian fluid Condensed Matter::Soft Condensed Matter symbols Energy (miscellaneous) |
| Zdroj: | Energies, Vol 13, Iss 6635, p 6635 (2020) Energies; Volume 13; Issue 24; Pages: 6635 |
| ISSN: | 1996-1073 |
| Popis: | Many types of dense suspensions are complex materials exhibiting both solid-like and fluid-like behavior. These suspensions are usually considered to behave as non-Newtonian fluids and the rheological characteristics such as yield stress, thixotropy and shear-thinning/thickening can have significant impact on the flow and the engineering applications of these materials. Therefore, it is important to understand the rheological features of these fluids. In this paper, we study the flow of a nonlinear fluid which exhibits yield stress and shear-thinning effects. The geometries of interests are a straight channel, a channel with a crevice and a pipe with a contraction; we assume the fluid behaves as a Herschel-Bulkley fluid. The numerical simulations indicate that for flows with low Reynolds number and high Bingham number an unyielded plug may form in the center of the channel. In the case of a channel with a crevice, the fluid in the deep portion of the crevice is at an extremely high level of viscosity, forming a plug which is hard to yield. For the pipe with a contraction, near the pipe neck the unyielded region is smaller due to the enhanced flow disturbance. |
| Databáze: | OpenAIRE |
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