The Design and Flow Dynamics of Non-Brownian Suspensions
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Ohio University / OhioLINK
2020
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| Online Access: | http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1598018383854045 |
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ndltd-OhioLink-oai-etd.ohiolink.edu-ohiou15980183838540452021-08-03T07:16:12Z The Design and Flow Dynamics of Non-Brownian Suspensions Rashedi, Ahmadreza Mechanical Engineering suspension shear-induced migration yield stress fluids The rheology of non-Brownian suspension of solids in both simple and complex fluids has drawn much attention since there are so many industrial and daily life applications in the oil industry (e.g., Hydraulic fracturing), food processing, cosmetic, painting, concrete, muds, pharmaceutical, landslides, and mudslides. Characterizing the flow of particles suspended in Newtonian fluids and yield stress fluids is complicated due to complex phenomenon such as shear-induced migration. This phenomenon causes heterogeneity of particles in the fluid phase and size segregation in polydispersed suspension. Shearinduced migration occurs when the configuration of suspension flow is exposed to shear rate gradients such as channel and large gap Taylor-Couette flow. In the present work, the shear induced migration of particles suspended in Newtonian fluids is studied in a channel flow. The results are compared and discussed with theoretical models. It is shown that the prediction of models for the distribution of solid volume fraction is in good agreement with the results obtained in the present work close to the channel walls; however, there is a discrepancy between model prediction and experimental results for volume fraction at channel centerline. In addition, an engineered model suspension consisting of rigid particles and yield stress fluids is developed. The suspending fluid is an emulsion with adjustable density, rheological behavior, and refractive index. We explain the design procedure in detail. The optically transparent emulsion opens the possibility of exploring Particle Tracking/Image Velocimetry (PIV/PTV) techniques in studying dynamic flows involving particles in complex fluids. As a proof of concept, a set of experiments is performed to provide accurate measurements of solid volume fractions for the dispersion of particles in a Taylor-Couette cell. 2020 English text Ohio University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1598018383854045 http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1598018383854045 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws. |
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NDLTD |
| language |
English |
| sources |
NDLTD |
| topic |
Mechanical Engineering suspension shear-induced migration yield stress fluids |
| spellingShingle |
Mechanical Engineering suspension shear-induced migration yield stress fluids Rashedi, Ahmadreza The Design and Flow Dynamics of Non-Brownian Suspensions |
| author |
Rashedi, Ahmadreza |
| author_facet |
Rashedi, Ahmadreza |
| author_sort |
Rashedi, Ahmadreza |
| title |
The Design and Flow Dynamics of Non-Brownian Suspensions |
| title_short |
The Design and Flow Dynamics of Non-Brownian Suspensions |
| title_full |
The Design and Flow Dynamics of Non-Brownian Suspensions |
| title_fullStr |
The Design and Flow Dynamics of Non-Brownian Suspensions |
| title_full_unstemmed |
The Design and Flow Dynamics of Non-Brownian Suspensions |
| title_sort |
design and flow dynamics of non-brownian suspensions |
| publisher |
Ohio University / OhioLINK |
| publishDate |
2020 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1598018383854045 |
| work_keys_str_mv |
AT rashediahmadreza thedesignandflowdynamicsofnonbrowniansuspensions AT rashediahmadreza designandflowdynamicsofnonbrowniansuspensions |
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1719458057226813440 |