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 25 for “"perforated plate"”.
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Potential energy gradient on a perforated plate
Thesis: B.S., Massachusetts Institute of Technology, Department of Chemical Engineering, 1960
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Hydraulic gradient and pressure drop on a perforated plate
Thesis (M.S.) Massachusetts Institute of Technology. Dept. of Chemical Engineering, 1951.
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Damping Parameter Study of a Perforated Plate with Bias Flow
… the sensitivity of acoustic properties of multi-perforated liners to the changes in the geometry and flow conditions and be used as a tool to design acoustic liners. The conducted research provides an insightful understanding about the contribution of different flow and geometry parameters such …
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Computational Investigation of Perforated Plate Film Cooling Utilizing Conjugate Heat Transfer
… in predicting the cooling effectiveness of a perforated plate film-cooling arrangement is evaluated in ANSYS Fluent. A numerical investigation is performed using the Reynolds Averaged Navier Stokes equations and compared to NASA Glenn’s available Turbulent Heat Flux 4 experimental measurements …
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Numerical simulations of perforated plate stabilized premixed flames with detailed chemistry
… reactive flow solver to investigate perforated-plate stabilized laminar premixed flames. The developed code is used to examine the impact of the operating conditions and the perforated plate design on the steady flame characteristics. It is also used to numerically investigate the …
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Developing a mechanistic model for flow through a perforated plate with application to screening of particulate materials
Screening in mineral processing is the practice of separating granulated ore materials into multiple particle size fractions, and is employed in most mineral processing plants. Models of screening performance have been developed previously with the aim of improving process efficiency. Different …
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Performance of mild steel perforated plates as a blast wave mitigation technique
… geometric parameters on the performance of perforated plates as a blast wave mitigation technique. Results of experimental and numerical simulations are reported. The main objective of this investigation was to determine the effects of the perforated plate hole size on the blast wave …
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Sound radiation from perforated plates
Perforated plates are quite often used as a means of engineering noise control to reduce the sound radiated by structures. However, there appears to be a lack of representative models to determine the sound radiation from a perforated plate. The aim of this thesis is to develop such a model that …
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High intensity sound in lined ducts
… material consisting of a porous sheet or of a perforated plate followed by honey-comb cavities and backed by the impervious walls of the ducts. The effect of the acoustic material is included either by characterizing the material by a semi-empirical nonlinear impedance or by coupling the waves …
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The effects of freestream turbulence on the drag of a sphere
… scale Λ were manipulated by using orificed perforated plates. The proper combination of orificed perforated plate hole diameter, sphere size, and sphere location enabled the independent variations of turbulence intensity and relative integral length scale (Λ/d) from 1.8% to 10.7% and from …
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Mechanisms of liquid extraction in a pilot plant sieve plate column
… to droplet hydrodynamics and mass transfer in perforated (sieve)plate liquid-liquid extractor columns has been reviewed. An experimental investigation was conducted in a 450 mm diameter perforated plate extractor with four plates using four different designs with holes of 1.588 mm, 3.175 mm, …
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Development of a multi-scale projection method with immersed boundaries for chemically reactive flows and its application to examine flame stabilization and blow-off mechanisms
… in two canonical configurations: bluff-body and perforated-plate, were investigated and the underlying physical mechanisms were elucidated. A significant departure from the conventional two-zone premixed flame-structure was observed in the anchoring region for both configurations. In the …
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An experimental study of lifting and moving forces in air conveying systems
… into a plenum with a top surface that is a flat perforated plate. Air escapes through the openings, creating a layer that supports and drives the articles along. This thesis provides information on the lifting and moving forces. It summarizes the results of both analytical and experimental …
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Development of Velocity Profile Generating Screens for Gas Turbine Components
… match real world conditions through the use of perforated plates. The velocity profile generating screen is an array of jets arranged in a manner to produce sections of different solidities, a ratio of area that obstructs fluid flow compared to that of the total area. In an effort to better …
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Physics-based flame dynamics modeling and thermoacoustic instability mitigation
… were the wake-stabilized flames and the perforated-plate stabilized flames. In order to investigate the wake-stabilized flames, experiments were performed in an atmospheric pressure, backward-facing step combustor. In this configuration, the dynamics are primarily governed by the …
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On-site testing of crop drying fans
… by measuring the pressure drop across calibrated perforated plate positioned between the two fans. Airflow through each of the trailer supply ports was determined in a similar manner by measuring the pressure drop across calibrated resistance plates. Measured airflow to the trailers from dryer …
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Jet impingement on porous surfaces
… of the surface. For the ?=0.31 mesh and ?=0.26 perforated plate, there are marked differences between the axisymmetric and planar cases. For the planar cases the flow is turned downstream of the porous surface away from the centreline such that on the centreline the axial velocity falls to zero, …
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Design of passive decay heat removal system for the lead cooled flexible conversion ratio fast reactor
… air. Enhancements such as axial fins, a perforated plate, and round indentations, or dimples, were considered as additions to the hot air riser to increase heat transfer. Other enhancements include a liquid metal bond between the reactor and guard vessels, and a dual-level design which …
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Acoustic Scattering by Gratings
… thesis considers the sound scattering by thin perforated plates, to further understand and develop analytic models for porous noise reduction metamaterials. The semi-analytic Fokas method is extended to periodic geometries, and the resulting integral equation, recognised as a generalised …
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Experiments and Impedance Modeling of Liners Including The Effect of Bias Flow
The study of normal impedance of perforated plate acoustic liners including the effect of bias flow was studied. Two impedance models were developed, by modeling the internal flows of perforate orifices as infinite tubes with the inclusion of end corrections to handle finite length effects. These …
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