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 20 of 238 for “"Low Reynolds"”.
-
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 …
-
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 …
-
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. …
-
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, …
-
Post stall propeller behavior at low Reynolds numbers
… aerodynamics was observed in small propellers at low Reynolds numbers. First, performance data (thrust, power, and efficiency) of set variable pitch propellers was acquired in a wind tunnel. The propellers were 6 to 9.9 inches in diameter and were able to pitch to extreme angles. Second detailed …
-
Measurements of Wings at Very Low Reynolds Numbers
Very low Reynolds number aerodynamics is a rapidly growing field of interest, especially in regard to the design and development of micro- and nano-air vehicles. In the work culminating in this thesis, force measurement apparatuses were designed and prototyped to measure wing performance at very …
-
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 …
-
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 …
-
Aspect ratio effects on wings at low Reynolds numbers
… the effect of three dimensionality on the flow around wings at low Reynolds numbers. It was seen that the effects observed at high Reynolds number are also present in this Re range. There is the usual increase in lift slope and this increase can even be predicted with reasonable accuracy …
-
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.
-
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, …
-
Computational investigation and design of low Reynolds number micro-turbomachinery
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1997.
-
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 …
-
Mixing at Low Reynolds Numbers by Vibrating Cantilevered Ionic Polymers
Creating mixing at low Reynolds numbers is a non-trivial challenge that has been approached from many different perspectives, using passive or active methods. This challenge been further highlighted with the rise of microfluidics. Based on the diminutive size of these devices, the Reynolds numbers …
-
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
-
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 …
-
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 …
-
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 …
-
Acoustic influences on flow over an airfoil at low Reynolds numbers
… environment was experimentally investigated at a Reynolds number of 200,000. The Wortmann FX-63-137-ESM airfoil section was used for the model with an aspect ratio of 4. Some acoustic disturbances could alter the transition process in the shear layer of the separation bubble on the upper surface …
-
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 …
Page 1 of 12