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The Design and Flow Dynamics of Non-Brownian Suspensions

Rashedi, Ahmadreza
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1598018383854045

Abstract Details

2020, Doctor of Philosophy (PhD), Ohio University, Mechanical Engineering (Engineering and Technology).
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.
Sarah Hormozi (Advisor)
Guillaume Ovarlez (Advisor)
139 p.
Mechanical Engineering
suspension; shear-induced migration; yield stress fluids

Recommended Citations

Citations

  • Rashedi, A. (2020). The Design and Flow Dynamics of Non-Brownian Suspensions [Doctoral dissertation, Ohio University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1598018383854045

    APA Style (7th edition)

  • Rashedi, Ahmadreza. The Design and Flow Dynamics of Non-Brownian Suspensions. 2020. Ohio University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1598018383854045.

    MLA Style (8th edition)

  • Rashedi, Ahmadreza. "The Design and Flow Dynamics of Non-Brownian Suspensions." Doctoral dissertation, Ohio University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1598018383854045

    Chicago Manual of Style (17th edition)

ohiou1598018383854045
131
© 2020, all rights reserved.
This open access ETD is published by Ohio University and OhioLINK.