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Showing 1 to 20 of 80 for “"Low Reynolds numbers."”.
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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 …
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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 …
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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 …
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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 …
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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 …
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Analytical Study of Flow Past a Circular Cylinder at Low Reynolds Numbers
Made available in DSpace on 2014-12-10T17:25:42Z (GMT). No. of bitstreams: 1 6808135.pdf: 2725760 bytes, checksum: 4b2406af8107f899a366942ccbe6de6a (MD5) Previous issue date: 1967
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Performance and slipstream characteristics of small-scale propellers at low Reynolds numbers
The low Reynolds number effects of small-scale propellers were investigated. At the Reynolds numbers of interest (below 100,000), a decrease in lift and an increase in drag is common making it difficult to predict propeller performance characteristics. A propeller testing apparatus was built to …
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Characteristics of airfoils in an oscillating external flow at low Reynolds numbers
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1990.
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Heat transfer in mixing vessels at low Reynolds numbers. An experimental study of temperature profiles heat transfer rates and power requirements for mechanically agitated vessels operating at low Reynolds numbers.
The present study investigates experimentally the laminar mixing and heat transfer of a range of helical ribbon and anchor impellers for both Newtonian and inelastic non-Newtonian fluids. The work also correlates the experimental data empirically in the form of dimensionless groups. In order to …
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Effect of Heat Transfer on Flow Field at Low Reynolds Numbers in Verticaltubes
Made available in DSpace on 2014-12-05T17:15:30Z (GMT). No. of bitstreams: 1 6000230.pdf: 8147700 bytes, checksum: 7c04c8e1ee39e0ce32c266eac3d9694f (MD5) Previous issue date: 1959
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Aerodynamic performance of low-to-moderate aspect ratio wings at low Reynolds numbers
… thesis presents wind tunnel results of wings of low-to-moderate aspect ratio (2$\leq$\AR$\leq$5) tested at low Reynolds numbers (40,000 to 160,000). All models tested had a chord length of 3~in and a wingspan of 7 to 17.5~in. Experiments were conducted in the low-turbulence wind tunnel in the …
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The flow of a high temperature, variable viscosity liquid, at low Reynolds numbers.
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Mechanical Engineering, 1966
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Aerodynamic and aeroacoustic design of small unmanned aircraft system propellers at low Reynolds numbers.
… and inefficiencies in power consumption at low Reynolds numbers. Experimental noise data compared stock, modified, and five bladed propellers reducing tip vortex strength and noise generation. Results showed measurable far field sound decay and five bladed noise reductions of 5 dBA. Three …
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Fully Turbulent Wakes at Low Reynolds Numbers: the Case of the Thin Flat Plate
The wake of a thin flat plate normal to uniform flow exhibits unique behaviour, with much research suggesting it undergoes a fundamentally different Reynolds number-dependent tran-sition process to turbulence than wakes behind canonical geometries. Moreover, there is vast disagreement over the …
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The design of small propellers operating at low Reynolds numbers and associated experimental evaluation.
… to decreased efficiencies while operating in low Reynolds numbers conditions. This work details contributions made by Baylor University, in collaboration with the United States Air Force Academy, which include a custom propeller design, analysis, and solid-modeling code for experimental …
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Experimental wind tunnel study of airfoils with large flap deflections at low Reynolds numbers
Lift, drag, and moment measurements were taken at low Reynolds numbers for four airfoils with trailing edge plain flaps in an attempt to understand the effects of Reynolds number, percent thickness (t/c), percent chord of flap (flap-chord ratio), and flap deflection on airfoil performance. The four …
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Applications of an immersed boundary method on two-dimensional flows at low Reynolds numbers
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2024-03-01 without embargo terms
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Settling Velocity of Straight and Curved Rods at Low Reynolds Numbers in a Quiescent Fluid
… measure the settling velocity of curved rods at low Reynolds numbers typical of microfibres found in atmospheric samples. An experimental model was developed to relate the Reynolds number at terminal velocity and drag coefficient for both straight and curved rods. Non-ideal effects can …
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The Effect of Freestream Turbulence on Separation at Low Reynolds Numbers in a Compressor Cascade
… and performance in a compressor cascade at low Reynolds numbers. Tests were performed at 25° and 37.5° stagger angle, negative and positive angles of incidence up until the point of full stall, Reynolds numbers from 6 x 104 to 12.5 x 104, and turbulence intensities from approximately 0.7% – …
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