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Start-up rheometry of highly polydisperse magnetorheological fluids: experiments and simulations
| Content Provider | Semantic Scholar |
|---|---|
| Author | Ruiz-López, José Antonio Wang, Zhi Wei Fernández-Toledano, Juan Carlos Hidalgo-Álvarez, Roque Vicente, Juan De |
| Copyright Year | 2016 |
| Abstract | An extensive experimental and simulation study is carried out in conventional magnetorheological fluids formulated by dispersion of mixtures of carbonyl iron particles having different sizes in Newtonian carriers. Apparent yield stress data are reported for a wide range of polydispersity indexes (PDI) from PDI = 1.63 to PDI = 3.31, which for a log-normal distribution corresponds to the standard deviation ranging from ν = 0.38 to ν = 0.76. These results demonstrate that the effect of polydispersity is negligible in this range in spite of exhibiting very different microstructures. Experimental data in the magnetic saturation regime are in quantitative good agreement with particle-level simulations under the assumption of dipolar magnetostatic forces. The insensitivity of the yield stresses to the polydispersity can be understood from the interplay between the particle cluster size distribution and the packing density of particles inside the clusters. |
| Starting Page | 245 |
| Ending Page | 256 |
| Page Count | 12 |
| File Format | PDF HTM / HTML |
| DOI | 10.1007/s00397-016-0914-y |
| Volume Number | 55 |
| Alternate Webpage(s) | http://centaur.reading.ac.uk/54004/1/Ruiz_Lopez_et_al_Polydisp_MR.pdf |
| Alternate Webpage(s) | https://doi.org/10.1007/s00397-016-0914-y |
| Journal | Rheologica Acta |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
