Dissertations / Theses on the topic 'Rotating flow'
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Kilic, Muhsin. "Flow between contra-rotating discs." Thesis, University of Bath, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.357401.
Full textPadley, Robert William. "Fluid flow past rotating bodies." Thesis, University of Leeds, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.396927.
Full textWongl, Li Shing. "Flow and heat transfer in buoyancy induced rotating flow." Thesis, University of Sussex, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.250118.
Full textAlam, M. "Computation of flow of rotating gases." Thesis, University of Oxford, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239352.
Full textSchulmeister, James Crandall. "Flow separation control with rotating cylinders." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/78196.
Full textCataloged from PDF version of thesis.
Includes bibliographical references (p. 61-62).
The hydrodynamic forces on ocean vehicles increase dramatically during sharp maneuvers as compared to forward motion due to large areas of separated flow. These large forces severely limit maneuverability and reduce efficiency. Applying active flow separation control to ocean vehicles would reduce resistance during maneuvers and thereby improve maneuvering performance. In this thesis I discuss experiments in active separation control in a simpler, but still relevant, two-dimensional flow past a circular cylinder at moderate sub-critical Reynolds numbers (37,000 and 52,000 in experiment and 100 and 10,000 in simulation). The active control injects momentum into the boundary layer via the moving surfaces of two small control cylinders located near boundary layer separation and rotated by servo motors. The relationship between drag and rotation rate is found to be Reynolds number regime dependent; at Re = 100 the drag decreases linearly with rotation rate and at Re = 10,000, the relationship is non-linear. This nonlinearity appears to be due to the interaction between vortex shedding from the small control cylinders (which does not occur at Re = 100) and the main cylinder wake. Computational two-dimensional viscous simulations are consistent with the physical experiment and help to illustrate the phenomenon. Finally, the power consumed by the active control mechanism is considered and estimated to be significantly smaller than the power savings in reduced drag.
by .James Crandall Schulmeister
S.M.in Ocean Engineering
Burns, John Robert. "Liquid distribution in a rotating packed bed." Thesis, University of Newcastle Upon Tyne, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308010.
Full textGundersen, Ted Ørjan Kjellevik. "Modelling of Rotating Turbulent Flows : Computer simulation of turbulent backward-facing step flow with system rotation." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for energi- og prosessteknikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-13925.
Full textBambrey, Ross R. "Strong interactions between two co-rotating vortices in rotating and stratified flows /." St Andrews, 2007. http://hdl.handle.net/10023/341.
Full textGonc, L. Oktay. "Computation Of External Flow Around Rotating Bodies." Phd thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12605985/index.pdf.
Full texts upwind flux differencing scheme for spatial and Runge-Kutta explicit multistage time stepping scheme for temporal discretization on unstructured meshes is developed for the unsteady solution of external viscous flow around rotating bodies. The main aim of this study is to evaluate the aerodynamic dynamic stability derivative coefficients for rotating missile configurations. Arbitrary Lagrangian Eulerian (ALE) formulation is adapted to the solver for the simulation of the rotation of the body. Eigenvalues of the Euler equations in ALE form has been derived. Body rotation is simply performed by rotating the entire computational domain including the body of the projectile by means of rotation matrices. Spalart-Allmaras one-euqation turbulence model is implemented to the solver. The solver developed is first verified in 3-D for inviscid flow over two missile configurations. Then inviscid flow over a rotating missile is tested. Viscous flux computation algorithms and Spalarat-Allmaras turbulence model implementation are validated in 2-D by performing calculations for viscous flow over flat plate, NACA0012 airfoil and NLR 7301 airfoil with trailing edge flap. The ALE formulation is validated in 2-D on a rapidly pitching NACA0012 airfoil. Afterwards three-dimensional validation studies for viscous, laminar and turbulent flow calculations are performed on 3-D flat plate problem. At last, as a validation test case, unsteady laminar and turbulent viscous flow calculations over a spinning M910 projectile configuration are performed. Results are qualitatively in agreement with the analytical solutions, experimental measurements and previous studies for steady and unsteady flow calculations.
Ivey, P. C. "Self-induced flow in a rotating tube." Thesis, University of Sussex, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308072.
Full textChilakamarri, Kiran Babu. "Rotating and stratified fluids /." The Ohio State University, 1988. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487584612163036.
Full textMcLean, Douglas R. "Magnetohydrodynamic instabilities in a rapidly rotating system." Thesis, University of Glasgow, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.363148.
Full textPathmathas, Thirunavukkarasu. "Granular flow modelling of rotating drum flows using positron emission particle tracking." Doctoral thesis, University of Cape Town, 2015. http://hdl.handle.net/11427/15707.
Full textBambrey, Ross R. "Strong interaction between two co-rotating vortices in rotating and stratified flows." Thesis, University of St Andrews, 2007. http://hdl.handle.net/10023/341.
Full textShort, David James. "Swirling flow induced by a rotating magnetic field." Thesis, Imperial College London, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338644.
Full textImayama, Shintaro. "Studies of the rotating-disk boundary-layer flow." Doctoral thesis, KTH, Strömningsfysik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-158973.
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Phillips, Andrew. "Two phase flow in rapidly rotating porous media." Thesis, University of Nottingham, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.289324.
Full textWhitehurst, E. P. "Flow dissipation in rotating superfluid sup(3)He." Thesis, University of Manchester, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.356718.
Full textDavison, Joel Benjamin. "Numerical modelling of sand flow around rotating augers." Thesis, University of Hertfordshire, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.415856.
Full textWillis, Ashley Phillip. "The hydromagnetic stability of Taylor Couette flow." Thesis, University of Newcastle Upon Tyne, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.246621.
Full textImayama, Shintaro. "Experimental study of the rotating-disk boundary-layer flow." Licentiate thesis, KTH, Mekanik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-95147.
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Wang, Juan. "Experimental study of two counter rotating axial flow fans." Thesis, Paris, ENSAM, 2014. http://www.theses.fr/2014ENAM0024/document.
Full textABSTRACT : The counter rotating subsonic axial flow fans could be a good solution for applications where the highly improved static pressure and efficiency are required without the increase of rotational speed and fan diameter. However, the mechanisms of high performance CRS and parameters influences are not well understood nowadays. This thesis is an experimental investigation of the performance and parameter studies of two counter rotatingaxial flow ducted fans. The design and measurement methods are based on the previous research work in Laboratory Dynfluid (Arts et Métiers ParisTech). Three Counter Rotating Stages (CRS) (named JW1, JW2 and JW3) are developed and tested on a normalized test bench (AERO2FANS). These systems have same design point and differ by the distribution of loading as well as the ratio of angular velocity between the Front Rotor (FR) and Rear Rotor (RR). The first part of results focus on the JW1. The overall performance is obtained by the experimental results of the static pressure rise and static efficiency, as well as the wall pressure fluctuations recorded by a microphone on the casing wall. The parameter study is conducted to investigate the effects of the axial distance and the ratio of angular velocity between the FR and RR on the global performance and flow fields measured by Laser Doppler Velocimetry (LDV).The last part of the work is devoted to analyze the differences of the three CRS with different distribution of work, in terms of the global performance and flow features
Barnes, Denise Ruth. "Finite-amplitude travelling wave solutions in rotating pipe flow." Thesis, University of Bristol, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310658.
Full textLi, Yan-Ling. "Numerical simulations of rotating stall in axial flow compressors." Thesis, University of Sussex, 2014. http://sro.sussex.ac.uk/id/eprint/47428/.
Full textTang, Hui. "Theoretical models of buoyancy-induced flow in rotating cavities." Thesis, University of Bath, 2017. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.715282.
Full textRosenthal, Adam D. (Adam David) 1978. "Ferrofluid flow and torque measurements in rotating magnetic fields." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/16857.
Full textIncludes bibliographical references (leaves 117-121).
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
The purpose of this research is to provide data from ferrofluid flow and torque measurements in uniform and nonuniform rotating magnetic fields that can be compared to theoretical analyses in order to fully understand observed paradoxical ferrofluid behavior. In the presence of rotating magnetic fields, ferrofluid particles will rotate to try to align their magnetic moment with the field but because of the fluid viscosity, magnetization M will lag behind the rotating H field, thereby resulting in a body torque on the ferrofluid. The viscous torque from this fluid flow is measured using a Couette viscometer as a function of magnetic field amplitude, frequency, and direction of rotation. The first three sets of experiments measure this torque on the outer wall of a Lexan spindle that is attached to a viscometer, functioning as a torque meter. The spindle is immersed in a beaker of ferrofluid centered inside a 2-pole or 4-pole motor stator winding, creating uniform or nonuniform rotating magnetic fields, respectively. The spindle rotates at a constant speed up to 100 rpm or is stationary in these measurements. Anomalous behaviors such as zero and negative magnetoviscosity are demonstrated and discussed. The next set of experiments measure the magnetic torque on the inner wall of a hollow spindle attached to the torque meter and filled completely with ferrofluid so that there is no free surface. The spindle is centered inside the motor stator windings and exposed to clockwise (CW) or counterclockwise (CCW) rotating magnetic fields. The last set of experiments measures the surface spin rate of a small floating plastic ball placed on the ferrofluid surface at a fixed location as a function of magnetic field parameters and radial position on the surface. When the rotating magnetic fields induce ferrofluid flows, the ball spins in the opposite direction to magnetic field rotation and this spin rate is determined using frame-by-frame video analysis.
by Adam D. Rosenthal.
M.Eng.
Harris, Joseph H. "Stability of the flow over a rough, rotating disk." Thesis, University of Warwick, 2013. http://wrap.warwick.ac.uk/60307/.
Full textHegseth, John. "Spatiotemporal patterns in flow between two independently rotating cylinders /." The Ohio State University, 1990. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487676847116532.
Full textDalwadi, Mohit. "Flow and nutrient transport problems in rotating bioreactor systems." Thesis, University of Oxford, 2014. https://ora.ox.ac.uk/objects/uuid:1d7298b7-cdf5-4240-a79c-b7b69f662c1a.
Full textWilson, Matthew Bernard. "Numerical study of plane couette flow in a rotating framework." Thesis, Georgia Institute of Technology, 1987. http://hdl.handle.net/1853/17359.
Full textDi, Bartolomeo Walter. "The flow between rotating disks : a view of multiple solutions." Thesis, McGill University, 1988. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=61890.
Full textGosselin, Frédéric. "Stability of a rotating cylindrical shell containing axial viscous flow." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=99764.
Full textConsidering the unsuccessful results obtained with the inviscid theory, it is believed that the added realism brought in by the introduction of viscosity in the theory can lead to a successful model. Assuming a travelling-wave perturbation scheme, the linear Donnell-Mushtari thin shell equations are coupled with the fluid stresses obtained by solving numerically the incompressible Navier-Stokes equation for a laminar or turbulent flow. A novel triple-perturbation approach is established to consider the interaction between the fluid and the structure. This triple-perturbation approach is in essence a superposition of three fluid fields caused by the three components of the shell deformation for a given oscillation mode. It is found that the usual technique for linear aeroelasticity studies consisting of applying the fluid boundary conditions at the undeformed position of the wall instead of the instantaneous deformed position greatly alters the stability of the system. To remedy to this problem, three different corrections are applied and tested on the carefully derived model. The dynamics of the system subjected to purely axial flow with no rotation is successfully studied with the viscous model for both laminar and turbulent flow conditions. Because no experimental or previous theoretical data is available, it is impossible to validate the results obtained in the laminar regime. For the turbulent regime, as the Reynolds number is increased, the results tend more and more towards those obtained with the inviscid theory.
The results obtained for small rates of rotation show that both in the laminar and in the turbulent regime, the system tends to be stabilised when subjected to a small rate of rotation. On the other hand, this tendency should be reversed for higher rates of rotation, but it is impossible to show this due to the limitations of the root-finding method employed.
Jumah, Rami Yousef. "Flow and drying characteristics of a rotating jet spouted bed." Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=29056.
Full textDrying kinetics of corn as a test material was investigated using both continuous and intermittent (on/off) spouting/heating schemes. The parameters investigated include inlet air temperature, bed height, superficial air velocity, nozzle diameter, distributor rotational speed and intermittency of spouting and heat input. The results indicate that the drying kinetics are comparable with conventional spouted and fluidized beds for slow drying materials and that intermittent drying can save up to 40% of the thermal energy consumption.
A fully predictive diffusion-based mathematical model was developed and validated for both continuous and intermittent drying in the RJSB. Several other time-dependent spouting/heating schemes were evaluated numerically in the light of their potential practical applications.
Johnson, A. R. "Flow resistance in circular tubes rotating about a parallel axis." Thesis, University of Hull, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233988.
Full textKeane, R. J. "Characterising Lagrangian stirring in a thermally driven rotating annulus flow." Thesis, University of Oxford, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.432344.
Full textFerris, Ryan J. "Numerical investigations of flow past a partially rotating stepped cylinder." Thesis, California State University, Long Beach, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=1570832.
Full textNumerical investigations of flow past a partially rotating, circular cross-section, stepped cylinder in uniform flow at varying velocity ratios, diameter ratios and Reynolds Numbers are performed. The resulting flow fields are analyzed visually for the effect of rotation on the wake and numerically for the effect on lift/drag forces as well as vortex shedding rates. Simulations are run where either the large or small-diameter cylinder was rotating while the other cylinder was held stationary. Simulations were performed with end plates to minimize end effects. Results show with increasing the velocity ratio when the large cylinder rotates, vortex shedding is suppressed across the entire wake span. Comparatively, an increase in velocity ratio for the small-diameter cylinder during rotation results in increased wake activity and a larger drag force.
Gilham, S. "Theoretical study of self-induced flow in a rotating tube." Thesis, University of Sussex, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308065.
Full textLavrich, Philip Lewis. "Time resolved measurements of rotating stall in axial flow compressors." Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/14567.
Full textDozier, Kahlil A. "Characterizing ferrofluid spin-up flow in rotating uniform magnetic fields." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/91442.
Full text6
Cataloged from PDF version of thesis.
Includes bibliographical references (page 85).
A ferrofluid is a collection of nanoscale ferromagnetic particles with a stabilizing surfactant in a liquid to form a colloid. The dynamic behavior of ferrofluids in the presence of magnetic fields has long been an area of research interest. A particular area of interest deals with the "spin-up" mechanisms of ferrofluids, which describe how a container of ferrofluid comes to a steady state of bulk flow when subjected to a uniform rotating external magnetic field. There are two prevailing theories that attempt to explain the spin-up mechanisms of ferrofluids: spin diffusion theory, and the presence of non-uniformities in the magnetic field, due to "demagnetizing factors" introduced by the shape of the container. This research attempts to confirm previous measurements indicating that non-uniformities in the magnetic field are the primary cause of ferrofluid bulk flow. Partial spheres and cylindrical containers of different volumes -- and thus different demagnetizing factors -- were filled with Ferrotec EFH1 oil-based ferrofluid and subjected to an external uniform rotating magnetic field for various parameters of rotation direction and magnetic field. Ferrofluid bulk flow was measured using ultrasound velocimetry, and the magnitudes and shapes of the velocity profiles were compared. Despite the complicated flows observed within the containers, enough of a trend was established to safely conclude that demagnetizing factors are often the primary cause of ferrofluid bulk flow.
by Kahlil A. Dozier.
M. Eng.
Rhodes, Scott E. (Scott Edward) 1981. "Magnetic fluid flow phenomena in DC and rotating magnetic fields." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/17670.
Full textIncludes bibliographical references (p. 299-301).
An investigation of magnetic fluid experiments and analysis is presented in three parts: a study of magnetic field induced torques in magnetorheological fluids, a characterization and quantitative measurement of properties relating to the transition of a ferrofluid drop from a continuous phase into a discrete phase and also into a spiral flow, and a study of magnetic field induced ferrofluid flow reversals. The torque exerted on a spindle filled with magnetorheological fluid (MR fluid) and placed inside a uniform rotating magnetic field is measured with varying rotating magnetic field amplitude and frequency, total fluid volume, and MR fluid volume ratio. When compared to similar ferrofluid torque measurements where the torque increased with rotating magnetic field frequency, the torque frequency dependence of the MR fluid decreases with increasing magnetic field frequency. A simple analysis determines the dependence of the magnetic body torque on particle size to describe the different behavior between the ferrofluid and MR fluid. When a fluorocarbon based ferrofluid is contained between two glass plates separated by a small gap (Hele-Shaw cell) and excited by an applied uniform rotating magnetic field first and then a DC axial magnetic field, a phase like transition occurs that transforms the ferrofluid drop from a continuous phase to a discrete phase. Considering the dominant energy in the configuration to be contributed from the magnetostatic energy of the DC magnetic field and interfacial surface energy, a calculus of minimization of free energy is performed to determine the number of smaller ferrofluid drops that will result from the transition and the threshold axial magnetic field for the transition to occur.
(cont.) When the order of the applied magnetic fields is reversed, the DC axial magnetic field is applied first causing the ferrofluid droplet to form the labyrinth instability. The rotating magnetic field is then applied creating a spiral formation. Experiments are conducted for varying Hele-Shaw cell separation gap, and rotating magnetic field amplitude and frequency. Measurements were consistent with our model. A cylindrical vessel is filled with a water-based ferrofluid and excited by a uniform rotating magnetic field that induces a counter-rotating circular flow in the vessel. A DC axial magnetic field is slowly raised to change the curvature of the fluid surface and results in a change in the ferrofluid flow direction to co-rotating with the applied magnetic field. Measurements are taken of the threshold axial magnetic field that results in the change of flow direction for varying rotating magnetic field direction, amplitude, and frequency. An analysis is included that describes the change in flow direction due to surface curvature.
by Scott E. Rhodes.
S.M.
Appelquist, Ellinor. "The rotating-disk boundary-layer flow studied through numerical simulations." Doctoral thesis, KTH, Mekanik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-200827.
Full textQC 20170203
Begum, Assma. "Numerical Investigations of Flow Around a Wire-wrapped Rotating Cylinder." Thesis, California State University, Long Beach, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10786676.
Full textNumerical investigations of flow past rotating circular cylinders with and without wires wrapped on the surface of the cylinder were studied using Computational Fluid Dynamics (CFD). The flow characteristics such as flow separation, shedding of the primary and secondary vortices, and drag coefficients were investigated. The software STAR CCM+ from Siemens PLM was used in all investigations. Three-dimensional Unsteady Reynolds Average Navier Stokes (URANS) equations were utilized. The free stream mean velocity was constant at 10 m/sec, which corresponded to an approximate Reynolds number based on cylinder’s diameter of 32,000. The results are presented for cylinders with and without wires at varying rotation rates α of 0, 0.5, and 1. This is represented by α, the ratio of the tangential velocity at the cylinder to that of the free stream velocity of the flow. As the rotation rate increased from 0 to 1, the drag coefficient for the smooth rotating cylinder reduced, while the drag coefficient for the wire-wrapped cylinder increased. The wire-wrapped cylinder produced significantly higher lift when compared with the corresponding value for the smooth cylinder. Increasing the rotation rate increases the lift and lift to drag ratio.
Recktenwald, Ingo. "Experimental investigation of channel flow rotating about the streamwise axis /." Aachen : Shaker, 2008. http://d-nb.info/990141799/04.
Full textAppelquist, Ellinor. "Direct numerical simulations of the rotating-disk boundary-layer flow." Licentiate thesis, KTH, Mekanik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-146087.
Full textQC 20140708
Tham, K. M. "Flow and heat transfer in a H.P. compressor drive cone cavity." Thesis, University of Sussex, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.270356.
Full textShankare, Gowda Vrishank Raghav. "Radial flow effects on a retreating rotor blade." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/53403.
Full textAhlberg, Charlotte. "An experimental study of fiber suspensions between counter-rotating discs." Licentiate thesis, Stockholm : Kungliga Tekniska högskolan, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-11644.
Full textLygren, Magne. "Simulations of Turbulent Flow between a Rotating and a Stationary Disk." Doctoral thesis, Norwegian University of Science and Technology, Faculty of Engineering Science and Technology, 2001. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-409.
Full textThe main focus of this thesis is turbulent flow between a rotating and a stationary disk. The extension of the disks is assumed to be large enough to prevent the outer boundary conditions to influence the flow of the region of interest. This flow is driven by the shear between the disks, but an imbalance between centrifugal and pressure forces in the radial direction induce a radial cross-flow. The result is a complex three-dimensional flow where the direction of the mean flow varies with the axial position. Direct numerical simulations (DNS) and large eddy simulations (LES) have been used to investigate the flow. The simulations utilized a special set of quasi-periodic boundary conditions which allowed the use of a computational domain which captured only a section of the flow.
Torriano, Federico. "Investigation of the 3D flow characteristics in a rotating channel setup." Thesis, Université Laval, 2006. http://www.theses.ulaval.ca/2006/23957/23957.pdf.
Full textOng, C.-L. "Computation of fluid flow and heat transfer in rotating disc-systems." Thesis, University of Sussex, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233697.
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