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Showing 1 to 20 of 31 for “"Hydrodynamic Stability"”.
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Hydrodynamic Stability of Periodically Unsteady Axisymmetric and Swirling Jets
… have resulted in a high level of interest in the stability of axisymmetric and swirling jets. To date, the majority of studies on stability of axisymmetric and swirling jets have been completed under the assumption of steady flow in both axial and azimuthal (swirl) directions. Yet, flows such as …
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Hydrodynamic Stability of the boundary layer beneath a Stokes wave
This study aims to refine the linear stability analysis of the laminar boundary layer beneath a Stokes wave in deep waters, drawing on Fedele’s earlier findings. Fedele’s analysis focused on two-dimensional perturbations and employed a ”momentary” stability criterion. Here, we adopt a comprehensive …
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Effects of viscous dissipation on hydrodynamic stability of viscoelastic fluids
… viscoelastic fluids are examined in linearized hydrodynamic stability analysis for the effects of viscous dissipation, in plane Couette flow heated from below. All physical properties are assumed constant except the density in the body-force term of the momentum equation. Critical and marginal …
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Hydrodynamic stability of a premixed flame subjected to transverse shear
… of engineering devices. The primary intrinsic instability of premixed combustion is caused by thermal gas-expansion, known as the hydrodynamic or the Darrieus-Landau (DL) instability. Consequently, a premixed flame is susceptible to disturbances. The flame tends to develop a wrinkled or …
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Hydrodynamic Stability of Water and Its Effect on Melting and Freezing
Made available in DSpace on 2014-12-08T23:18:31Z (GMT). No. of bitstreams: 1 7020977.pdf: 6360768 bytes, checksum: 8aebd69d849ceaa1e7ee94e1473ed10d (MD5) Previous issue date: 1970
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Shape Optimisation for Hydrodynamic Stability and its Application to Cyclone Separators
… This can be described through a global stability analysis. This is an eigenvalue problem which gives a series of mode shapes (the eigenfunctions) and their growth rates and frequencies (the eigenvalues). This thesis calculates and interprets the shape sensitivity of the eigenvalue of a …
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Modeling Hydrodynamic Stability of Incline-Liquid Airblast Nozzle for Gas Turbine Combustion
… for varied spray angles.</p> <p>Two-dimensional stability analysis for laminar jet is performed numerically as a foundation for stability studies. An analytical investigation into the stability equation is also carried out using an asymptotic approach. This approach subdivides the jet into three …
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Natural and forced response measurement of hydrodynamic stability in an aircraft gas turbine engine
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1994.
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A parametric study of the hydrodynamic stability theory of 3-D compressible free shear flows
… and three-dimensional compressible hydrodynamic stability problem. A parametric study of free shear flows with two or more supersonic streams is performed. Flows examined included shear layers, jets/wakes, and various geometrical combinations of these flows. The effect of Mach number …
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The effect of polymer additives on the hydrodynamic stability and nonlinear evolution of thin liquid films
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1996.
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Hydrodynamic stability of liquid films adjacent to incompressible gas streams including effects of interface mass transfer
A theoretical study of linear stability of a gas/liquid interface with and without evaporation at the interface is presented. The zero mass transfer problem is solved for linear mean velocity profiles in both gas and liquid. The mass transfer problem is solved for small rates of evaporation, which …
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A numerical investigation of the linear hydrodynamic stability of Newtonian and weakly non-Newtonian channel flows as described by the Orr-Sommerfeld equation
The Orr-Sommerfeld equation describes the growth of infinitesimal disturbances to laminar solutions of the Newtonaian Navier-Stokes equations. In this dissertation we consides in part idealised flows between two parallel planes of infinite extent and a finite distance apart. They are referred to as …
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Lattice Boltzmann Methods for Diffuse and Mobile Interfaces
… the critical point. The first case pertains to hydrodynamic instabilities occurring in the canonical Taylor-Couette-Poiseuille problem, and the numerical study serves to demonstrate the existence of a Stationary Helical Vortex mode. In the second flow, the LB simulations allow the study of the …
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The development and stability of some non-planar boundary-layer flows.
… laminar flow internal to a square corner. The hydrodynamic stability of this flow is the subject of Chapter 3. For the special case of zero pressure gradient, our analysis suggests a critical Reynolds number of Re[subscript]c ≈ 44 000 (based on streamwise distance from the leading edge), …
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Engineering the Whirlwind
… suppression of turbulent mixing, arising from hydrodynamic stability and stable radial stratification of density in the vortex core, combined with sufficient lapse-rate divergence. Lapse-rate divergence describes a situation where the vortex core cools more slowly in rising than the surrounding …
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Analysis for Taylor vortex flow
… flow is one of the basic problems of nonlinear hydrodynamic stability. In contrast with the wide region of wavenumber predicted by the linear theory, experiments show that Taylor vortex flow only appears in a small region containing the critical wavenumber ß<sub>er</sub> This phenomenon is …
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Distribuição espacial dos moluscos bivalves na região da plataforma continental do Cabo Frio, Praia de Maçambaba, Estado do Rio de Janeiro, Brasil
… to a higher spatial heterogeneity and a higher hydrodynamic stability of the sediments at -'this depth. There was no sazonality in the occurrence or density of any species collected.
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The Effects of Variable Parameters on the Behavior of Initial Wind Waves
… waves is generally thought to be a viscous instability at the air-sea interface. The short, regular waves arising from a sudden wind on a still water surface have a dispersion relation which is characteristic of gravity-capillary waves. The effects of variable surface tension, viscosity and …
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An interferometric study of unsteady passing shock flow in a turbine cascade
… investigation was made into the application of hydrodynamic stability theory to turbine blade flows. The results of this evaluation were used in the determination of appropriate length scales for tailoring free stream turbulence to more effectively induce suction surface transition. Little …
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Instability of steady and quasi-steady detonations
The stability properties and dynamic behavior of steady and quasi-steady detonation theories are investigated through linear stability analysis and numerical simulation. A general, unsteady, three-dimensional formulation of the reactive Euler equations in a shock-fitted reference frame is derived. …
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