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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 45 for “"turbulent jet"”.
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Turbulent Jet of a Charged Suspension
Made available in DSpace on 2014-12-09T17:13:49Z (GMT). No. of bitstreams: 1 7013389.pdf: 2814255 bytes, checksum: ba014ff8a8c7437a7c95a89e5580a245 (MD5) Previous issue date: 1969
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Adjoint-based control of turbulent jet noise
… with much of the emphasis focused on lower jet-noise emission. Previous passive and active noise-reduction strategies required parametric experiments or cut-and-try approaches, a fact largely attributed to the complexity of turbulence as a source of sound and to the subtlety of the …
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The entrainment and mixing of a round buoyant turbulent jet in cross-flow
… behavior and physics of the round buoyant turbulent jet in crossflow. In particular, the study centers on the physics associated with entrainment and mixing phenomena of the jet with the goal of better understanding the trends of trajectory and dilution behavior.
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Hot-wire measurements of statistical and spectral evolution of an axisymmetric turbulent jet
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1991.
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Modeling the Effect of Particle Diameter and Density on Dispersion in an Axisymmetric Turbulent Jet
… entrainment behavior within axisymmetric turbulent jets is of significant interest to many areas of study. Research into multiphase flows within turbulent structures has primarily focused on specific geometries for a target application, with little interest in generalized cases. In this …
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The Non-Isoenergetic Turbulent Jet Mixing of a Two-Dimensional Supersonicjet With Consideration of Its Influence on The Base Pressure Problem
Made available in DSpace on 2014-12-05T19:15:51Z (GMT). No. of bitstreams: 1 0013542.pdf: 2446937 bytes, checksum: 1ad23c458f116f75349fc30ffd504036 (MD5) Previous issue date: 1955
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Analysis of the injection of a heated, turbulent jet into a moving mainstream, with emphasis on a thermal discharge in a waterway
… velocities and temperatures. The discharge of a turbulent effluent into a waterway was mathematically modeled as a submerged jet injection process by using an integral method which accounts for natural fluid mechanisms such as turbulence, entrainment, buoyancy, and heat transfer. The analytical …
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Detection of Floating Grains in DC Aluminum Casting
… cast microstructures and by recent work using a turbulent jet to suspend solute-poor grains and minimize macrosegregation.1,2 Experiments in this study were designed to sample grains from the mushy region of two ingots, one cast by the standard method and another stirred with a turbulent jet. …
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The numerical analysis of turbulent free jet flows.
… or Finite Element, method of analysis to free turbulent jet flows.This problem was considered to be appropriate for several reasons. First, a jet of fluid entrains and mixes with another fluid in a number of important engineering applications. Examples of these are legion and include their …
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Jet processing of direct chill cast aluminum ingots
… preferential settling, we propose the use of a turbulent jet to re-suspend the avalanching grains. An analytical expression is derived in order to optimize the dimension of the jet with the goal of minimizing centerline segregation. We then performed a series of experiments in order to validate …
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Chebyshev spectral method for incompressible viscous flow with boundary layer control via suction or blowing
… parameters of a multi-deck representation of a turbulent jet based on Coles' law of the wake was formulated. The appearance of spurious singularities in the Jacobian matrices associated with the system of equations and the vector of unknowns prevented this method from being implemented. Second, …
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Numerical Investigation using RANS Equations of Two-dimensional Turbulent Jets and Bubbly Mixing layers
… investigations of two-dimensional single-phase turbulent jets and bubbly mixing layers using Reynolds-Averaged Navier-Stokes (RANS) equations. The behavior of a turbulent jet confined in a channel depends on the Reynolds number and geometry of the channel which is given by the expansion ratio …
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Spinning modes in orderly jet structure and jet noise
The structural response of a subsonic turbulent jet to controlled forcing has been investigated both theoretically and experimentally. An experimental study has been carried out in which a model jet was subjected to acoustic excitation in the form of circumferential modes of azimuthal wavenumber …
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Geração de ruído por jatos turbulentos
… properties of the flow and sound fields of a turbulent jet are commented. It is shown that, to obbey energy conservation, the shear noise/self noise model requires interference between the two types of terms to occur. The importance of source coherence in the sound field is discussed, and some …
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A statistical jet-noise model based on the acoustic analogy and a RANS solution
We introduce a hybrid model for the evaluation of jet noise. The model uses the information from a solution of the Reynolds-averaged Navier-Stokes equations (RANS). It evaluates the jet-noise power spectral density (PSD) in the quiescent region outside the turbulent jet. It includes the following …
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Numerical Modeling of a Turbulent Plane Jet Impingement on a Solid Wall
Turbulent jet flows constitute a common problem for engineers. Owing to self-preservation in nature, a submerged jet has been well solved by the zero-equation turbulence model. However, in practice, the flow field is often confined by side walls or normal walls. Near those solid boundaries, flow …
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Studies of Turbulent Round Jets Through Experimentation, Simulation, and Modeling
This thesis studies the physics of the turbulent round jet. In particular, it focuses on three different problems that have the turbulent round jet as their base flow. The first part of this thesis examines a compressible turbulent round jet at its sonic condition. We investigate the shearing …
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Spray generation
… generated at the free surface of liquid wall jets and liquid axisymmetric jets flowing over sand and polystyrene (beads) roughed surfaces. Experiments were conducted with freshwater and Eulerian and Lagrangian methods of description were used in the analysis. Measurements were made with three …
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Characterization of mixing in a coaxial jet mixer for nanoparticle fabrication
Mixing in a micro-scale coaxial turbulent jet mixer for the fabrication of nanoparticles for drug delivery was experimentally characterized. Rapid mixing due to turbulence offers improved control of nanoparticle production over conventional bulk nanoprecipitation methods. Mixing time was determined …
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