Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 18 of 18 for “"particle migration"”.
-
Particle migration in a linear shear flow
Thesis. 1975. Ph.D.--Massachusetts Institute of Technology. Dept. of Mechanical Engineering.
-
Microfluidic flow of colloidal particles in nematic liquid crystals
… research conducted on the behaviour of colloidal particles in nematic liquid crystal flow for a wide range of parameters in microfluidic channels and ducts. We study the change in structure of defects and molecular orientation around a static particle, particle migration in microfluidic channels, …
-
Role of viscoelasticity and non-linear rheology in flows of complex fluids at high deformation rates
… in microfluidic devices, and 3) flow-induced particle migration in microchannels. Firstly, worm-like micellar solutions are model non-Newtonian fluids having a single relaxation time [beta]. At shear rates larger than ... however, these systems exhibit shear banding and non-linear rheological …
-
Single polymer dynamics in semi-dilute solutions: linear and ring polymers
… devices by coupling the Stokes trap with particle tracking. Here, we study the phenomenon of flow-induced particle migration to measure polymer-induced solution stresses and extensional viscosity in semi-dilute solutions of DNA and synthetic polymers. We combined the automated hydrodynamic …
-
Dilute Non-Newtonian Particle Suspension Rheology And Microstructure
The study of polymeric particle suspensions has been the subject of a number of past experimental and theoretical studies. However, fundamental questions about suspension rheology and shear flow-induced microstructural effects remain. First, a quasi-analytical study is presented that gives the first …
-
In situ electron microscopy of nanomaterials dynamics in heterogeneous phase environments
… structure dynamics of supported catalytic nanoparticles during heating and gas exposure. Particle migration and coalescence dominated above an onset temperature that depends on the gas. 3D topography captured that particles migrate through the bulk support and across the support surface. The …
-
Experimental Validation of Heteroclinic Orbit Dynamics in Inertial Microfluidics
This thesis explores particle dynamics in rectangular inertial microfluidic channels with the goal of improving label-free isolation of circulating tumor cells (CTCs) for liquid biopsy applications. CTCs are extremely rare in blood, making their separation both technically challenging and …
-
High Throughput Centrifuge Microfluidic Device for Simultaneous Particle Separation and Solution Exchange
… separation or solution exchange of various microparticles, bacteria, and mammalian cells. Yet, those devices capable of simultaneous solution exchange and particle separation are low in throughput (can operate at up to 2 mL/min), hindering their applicability to real-world settings. This thesis …
-
Processing to Enable Direct-Write Additive Manufacturing of Ceramics and Ceramic Composites
… Strongly dispersed, concentrated (φ = 0.42), nanoparticle (d<sub>50</sub> ~0.3 µm), zirconia (ZrO<sub>2</sub>) pastes were used to print densely filled, large continuous volume (≳ 1 cm<sup>3</sup>) ceramic components. An elastic shear modulus (G’) of 56,000 Pa and yield stresses between 6 and 10 …
-
The hydraulic transport of high concentration stabilized flow full plant mineral tailings
… velocity at the pipe wall 2. Wall effects due to particle interaction 3 . Boundary layer effects 4. Plug flow at high concentrations 5. Particle migration away from the wall leaving a sheared annular zone 6. Lateral dispersive stress acting between particle and pipe wall. The mechanism responsible …
-
Intestinal Handling of Food Grade Titanium Dioxide
… (fgTiO2) is a biologically persistent microparticle with an average diameter of 130 nm. It is an additive in the human diet and an excipient in some capsules, tablets, and toothpastes with a median intake of ~2.5 mg per person per day in the UK. Its impact, if any, is not understood. In …
-
Model electrode structures for studies of electrocatalyst degradation
… catalyst in these systems consists of nanoparticles of Pt or Pt-based alloys on carbon supports. Understanding the role of the nanoparticle size and structure on the catalytic activity and degradation is needed to optimize the fuel cell performance and reduce the noble metal loading. …
-
Microfluidic Transverse AC Electrophoresis Systems for Multiparameter Characterization of Single Particles and Cells
Particle characterization techniques are essential in a wide range of fields, including biological sciences, material science, environmental studies, pharmaceutical, and clinical research. Despite the availability of numerous characterization methods, spanning both ensemble and single particle …
-
Simulation of concentrated non-Brownian frictional and adhesive suspensions in linear and nonlinear flows
We present a particle-scale simulation method for non-Brownian suspension flows at low Reynolds number, based on the Fictitious Domain Method and supplemented by sub-grid lubrication corrections. In their usual form, sub-grid corrections involve the underlying linear flow. In the present work, the …
-
The Diffuse Bounce Back Lattice Boltzmann Method and its Applications on the Study of Fluid-Particle Interactions
… validated force model can be applied to fluid-particle interaction problems to study the behavior of particle in various flows, including the inertial migration of particle in the Taylor Couette flow.</p> <p>In this dissertation, the background and applications of fluid-structure interaction …
-
Experimental and Analytical Investigation of Particle Dynamics in Newtonian and non-Newtonian Fluids in a Taylor-Couette Cell
<p>This doctoral dissertation investigates heavy particle sedimentation in Newtonian and non-Newtonian fluids, aiming to understand their behavior in Drilling Fluid (DF) systems used in oil and gas industry, where such phenomenon can lead to operational issues such as lost circulation, well control …
-
Pore-scale Study of Flow and Transport in Energy Georeservoirs
… between reservoir depletion, proppant-particle compaction and movement, single-/multiphase flows and non-Darcy flows in a hydraulic fracture, and fracture conductivity evolution from a partial-monolayer proppant concentration to a multilayer proppant concentration. The potential effects …
-
Processing Approaches for Maintaining Multifunctionality in Advanced Thermoplastic Composites
… is not trivial, as the functionality of the particles must be retained during production, and the polymer matrix and particle interactions can often reduce the effectiveness of the final product. When fundamental principles, including thermodynamic and hydrodynamic considerations, are …