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 24 for “"hydrodynamic drag"”.
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Hydrodynamic drag force in liquids
… measured. When falling at constant velocity, the hydrodynamic drag force, D, is equal to the weight of the sphere, and the drag coefficient, CD, in the formula for the drag force, D = CD( 12rv2 )A could be evaluated as a function of Reynolds number, NR = rvah , and ball radius, a. In these …
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Hydrodynamic Drag and Flow Visualization of IsoTruss Lattice Structures
Hydrodynamic drag testing was conducted for eleven different configurations of IsoTruss® lattice structures. Flow visualization of prototypical IsoTruss® wind towers was also performed using Particle Image Velocimetry instrumentation. The drag test and flow visualization specimens included 6-node …
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Experimental implementation of Lorentz force actuators for hydrodynamic drag reduction
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2002.
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Analysis of hydrodynamic drag forces acting on suspended fine particle in porous media
… The simulations results are used to compute the drag forces experienced by suspended fine particles. The drag force distributions experienced by suspended fine particles of different sizes in various compact granular porous media – ordered (simple cubic (SC), body-centered cubic (BCC), …
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Passive and active approaches to sustained turbulent hydrodynamic drag reduction using superhydrophobic surfaces
… body, allowing for a reduction in skin friction drag. I begin by identifying and fabricating several superhydrophobic surfaces, and testing their ability to reduce skin friction in turbulent flows using a bespoke Taylor-Couette apparatus. These superhydrophobic surfaces possess different surface …
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Hydrodynamic drag of three-dimensional bodies by means of a Laser Doppler wake survey.
Thesis. 1978. M.S.--Massachusetts Institute of Technology. Dept. of Ocean Engineering.
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Mechatronic design of autonomous underwater vehicles for confined spaces
… tools are validated including the measurement of hydrodynamic drag and thruster performance, a visual dynamic software-in-the-loop simulation is developed that incorporates the validated vehicle model, a model-based quaternion error attitude controller is implemented and a structure light …
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Hydrodynamic loading of a porous plate at low Reynolds number conditions
… 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 fraction, [phi] = 69±2%). We characterize the dependence of the hydrodynamic loading on the size and shape of the perforations …
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Effects of piston design and lubricant selection on reciprocating engine friction
… on engine efficiency. The model incorporated hydrodynamic, boundary, and mixed lubrication modes, and it allowed for either fully-flooded or partially-flooded skirts. It also considered the effects of skirt deformation in response to applied loads. A dominant factor influencing net friction …
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Acoustic mode coherence in the Arctic Ocean
… is sensitive to vertical array tilt caused by hydrodynamic drag; a technique for its estimation from the acoustie data is developed. Tonal data taken from both the horizontal and vertical arrays deployed during FRAM IV is analyzed. Horizontal array results confirm the modal amplitudes generated …
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A sphere settling in a stratified fluid at small Reynolds number
… downstream. Using time-lapse photography, the drag on the sphere was measured and we have obtained the first experimental quantification of the added drag on a sphere due to stratification. We found that stratification increases the hydrodynamic drag, and that the added drag coefficient scales …
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A flexible underwater pressure sensor array for artificial lateral line applications
… tracking, and can help the vehicle reduce its hydrodynamic drag by providing information about the surrounding ow. This thesis begins with the development of a carbon black-PDMS elastomer material set. Using the material set, a 4-point-probe resistive strain gauge is developed and combined with …
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Magnetohydrodynamic Induction Pump Jet Propuslor for Undersea Vehicles
There has been a strong interest in Magnetohydrodynamic (MHD) technology for use in marine propulsion for over 60 years, but progress been limited due to the inability to create strong enough magnetic fields (> 5T). The Defense Advanced Research Projects Agency (DARPA), Defense Sciences Office …
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An experimental study of the human interface with one atmosphere diving suit by appendages
… is performed on the force contributions of the hydrodynamic drag acting on the appendage during motion through the application of Slender Body Theory paired with motion data from the IMUs.
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Impacts of channel curvature on drag, mixing, and stratification in estuaries
… how curvature-induced flow processes affect hydrodynamic drag, salinity mixing, and stratification in estuaries. In the North River (MA, USA), a sinuous, tidally-dominated estuary, drag is observed to be much greater than typically found in straight channel estuaries, and data analysis points …
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THE EFFECTS OF CURRENT BLOCKAGE ON OFFSHORE STRUCTURES
This thesis revisits the problem of hydrodynamic forces on fixed space-frame structures in combined waves and an in-line steady current. Because of current blockage, the actual drag force experienced by such structures is over-predicted by the standard Morison equation and the present industry …
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Impacts of Channel Curvature on Drag, Mixing, and Stratification in Estuaries
… how curvature-induced flow processes affect hydrodynamic drag, salinity mixing, and stratification in estuaries. In the North River (MA, USA), a sinuous, tidally-dominated estuary, drag is observed to be much greater than typically found in straight channel estuaries, and data analysis points …
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Kinetics of Brownian Transport
… entropic forces in Brownian transport, show that hydrodynamic drag plays a crucial role in Brownian motion in confined systems, and give an experimental realisation of Fick-Jacobs theory. The thermodynamic applications of HOTs considered here necessitate the creation of fine-tuned optical …
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Investigation of Hydrodynamic and Depletion Interactions in Binary Colloidal Dispersions
… affect both colloidal stability and near-contact hydrodynamics. This project focused on expanding our understanding of the effects of such negatively adsorbing materials on both equilibrium and dynamic interactions between particles. The effects of charged, hard spheres (silica nanoparticle) on …
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Drag coefficient and damping of moorings and their effect on FPSO's response
… thesis are to investigate mooring line damping, drag coefficient of mooring chain and their effect on the motions of FPSOs. In particular the aim is to determine the CD values of a stud-less chain under different flows by numerical methods due to limited CD data for chains. A turret moored FPSO …
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