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 175 for “"low Reynolds number"”.
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Low Reynolds number biohybrid swimming
… extension of robotics to smaller size scales at low cost and with the potential for mass production. Here, we present the design and fabrication of a biohybrid flagellum, using a single cluster of one to several cardiomyocytes to generate a bending force on a microscale filament. A slender body …
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Motion at low Reynolds number
… in 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 …
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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
… provide insight into the physics governing the flows and to determine the dependencies on a few parameters. We study the fluid dynamics of carbon dioxide storage in heterogeneous aquifers, the migration of tracers in such flows and the interaction of lava flows with barriers. First, in chapter 2, …
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Propulsion devices for locomotion at low-Reynolds number
… built, 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 …
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Unsteady Low Reynolds Number Aerodynamics of a Rotating Wing
… presents 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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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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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
… to 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 …
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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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Hydrodynamic loading of a porous plate at low Reynolds number conditions
… experimental work conducted to investigate the flow through and around porous 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 …
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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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Low Reynolds Number Laminar Separation Bubble Control Using a Backward Facing Step
… surface of a 9.5% thick airfoil operated at low Reynolds number (R<sub>N</sub> = 380,000) was investigated experimentally.</p> <p>An unmodified LRN-010 airfoil and a modified LRN-010 airfoil with a backward facing step on its upper surface were built and tested in the ERAU wind tunnel in …
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Numerical studies of the flow around an airfoil at low Reynolds number
A study of the flow around airfoils at low-Reynolds numbers has been performed, by a combination of direct numerical simulation (DNS) and linear stability analysis. The behaviour of laminar separation bubbles formed on a NACA-0012 airfoil at Rec = 5 £ 104 and incidence 5± is investigated. Initially …
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Biohybrid swimmers at low Reynolds number powered by tissue-engineered neuromuscular units
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-04-06 without embargo terms
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Broadband Noise Prediction of an Axial Compressor Operating at Low Reynolds Number
… noise in axial compressors operating at low Reynolds number. The low Reynolds number (chord based $Re_C \leq 5\times 10^4$) regime presents new flow physics by the large regions of laminar flow that are present in the compressor. As such it is unclear how our conventional understanding of …
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Cascade performance of a double arc compressor blade at low Reynolds number
… boundary layer for a quasi three-dimensional flow through a blade passage is presented. Experimental results for the velocity distributions along the blade surface, the flow deflection, and the profile loss are compared to the data obtained from the computer program for different angles of …
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Development and application of low Reynolds number turbulence models for air-cooled electronics
… continuing to increase due to the growth in the number of transistors on the silicon chip as predicted by Moore's Law. Thermal management techniques, used to dissipate this power, are becoming more and more challenging to design. Air cooling of electronic components is the preferred method for …
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