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.
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Showing 1 to 20 of 905 for “"Reynolds number"”.
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Low Reynolds number biohybrid swimming
… deformation and net propulsion at low Reynolds number. Microscale polydimethylsiloxane filaments are fabricated by etching channels into silicon wafers and filling those channels with uncured elastomer by capillary draw. Cell adhesion location is controlled by selective …
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Motion at low Reynolds number
… this thesis centers on inertialess motion at low Reynolds numbers at the crossroad between biofluids and microfluids. Here we address questions regarding locomotion of micro-swimmers, transport of nutrient around micro-organisms as well as mixing and heat exchange inside micro-droplets of water. A …
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Elastic tail propulsion at low Reynolds number
A simple way to generate propulsion at low Reynolds number is to periodically oscillate a passive flexible filament. Here we present a macroscopic experimental investigation of such a propulsive mechanism. A robotic swimmer is constructed and both tail shape and propulsive force are measured. …
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Some problems in low Reynolds number environmental flows
… an obstruction. We assume that the lava is a low Reynolds number gravity-driven flow and we study the free-surface deformation owing to the obstruction. For small smooth mounds, it is shown in chapter 6 that the flow surmounts the obstacles, but for larger mounds the flow is deflected around it …
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Propulsion devices for locomotion at low-Reynolds number
… and tested three novel devices that use low-Reynolds number flows for self propulsion. The three-link swimmer is designed to swim through in a free viscous fluid using cyclic flipping motion of two rigid fins attached to a rigid midsection. Robosnail 1 uses lubrication pressures underneath a …
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Unsteady Low Reynolds Number Aerodynamics of a Rotating Wing
… unique challenges as they operate at low Reynolds numbers O(10^4), and they share a flight regime with insects rather than conventional aircraft. The low Reynolds number regime is dominated by poor aerodynamic characteristics such as low lift-to-drag ratios. To overcome this, birds and …
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High Reynolds Number Unsteady Thermal Convection in a Shallow Layer
… by mean temperature advection. A relatively high Reynolds stress generated by the perpendicular transfer of longitudinal momentum in thermals was also observed. Implications with regard to the mean flow were discussed. Turbulent moment data were also applied to a second order closure model which …
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Bio-inspired adaptive wingtip devices for low Reynolds number operation
The student, Michael Lynch, submitted this Thesis for approval on 2017-04-27 at 18:38.
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Reynolds number effects on the aerodynamics of compact axial compressors
… viscous losses and reduced flow turning at low Reynolds numbers ($Re$). In domestic appliance compressors, $Re$ is typically in the range $10^4$ - $10^5$. Although the aerodynamics of isolated aerofoils operating at these $Re$ have been studied extensively, the flow fields within low $Re$ axial …
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Swimming at low Reynolds number slip boundaries and interacting filaments
Biological microorganisms swim in different types of fluids using a range of diverse motions and are often found in complex geometries. Their study is a rich field full of outstanding problems. One aspect that has attracted a lot of attention is the role played by hydrodynamic interactions, …
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Computational investigation and design of low Reynolds number micro-turbomachinery
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1997.
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Gap Size Effect on Low Reynolds Number Wind Tunnel Experiments
… measure the effect of gap size on semi-span low Reynolds number wind tunnel experiments. The lift forces on NACA 1412, NACA 2412 and NACA 4412 half wings were measured using a strain gauge balance at chord Reynolds numbers of 100,000 and 200,000 and three different gap sizes including sealed gap. …
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MOVING WALL JET FLOW NEAR CHANNEL EXIT AT MODERATE REYNOLDS NUMBER
… jet flow of a Newtonian fluid at moderate Reynolds number, emerging from a channel and flowing along one moving plate, while the other plate is stationary, is examined theoretically in this study. In this case, the equations of motion are reduced by expanding the flow field about the basic …
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Particle Dynamics in Inhomogeneous Flow at Moderate to High Reynolds Number
… complex inhomogeneous flows at moderate particle Reynolds numbers (Re = 10--600), we develop a DNS technique that resolves the smallest scales in the ambient flow and in the particle wake, and provides detailed microscale information on flow-particle interaction. We address the following sequence …
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Relating skewness and Fourier harmonics in low Reynolds number wake flow
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2026-05-01
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Optimizing the stroke of Purcell's rotator, a low Reynolds number swimmer
Purcell's rotator is a theoretical low Reynolds number swimmer that can act as a model of more complex natural microorganisms, such as E.coli. Because of the low Reynolds number environment, the swimmer has approximately no inertia and it's motion is dominated by viscous forces. The version of …
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Hybrid Eulerian/Lagrangian 3D methods for high Reynolds number reactive flows
… The transverse jet vorticity dynamics at high Reynolds numbers are first described, and more specifically the unsteady interactions between the wall boundary layer and the jet. We then present actuation strategies that manipulate the jet penetration and spread via simple nozzle-edge …
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Hydrodynamic loading of a porous plate at low Reynolds number conditions
… disks driven through a viscous fluid at low Reynolds number conditions. Specifically, we present the results from a series of experiments in which we investigated the hydrodynamic drag experienced by thin (thickness to diameter ratio is t/d < 5%), circular disks of constant porosity (void …
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Design of two-tailed swimmer to swim at low-Reynolds number
In the realm of systems with Reynolds numbers less than 1, swimming is a difficult task. Viscous forces from the fluid dominate inertial forces. In order to propel itself, a mechanism must be designed to overcome the viscous forces from the fluid and satisfy the non-reciprocal, cyclic motion …
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