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 13 of 13 for “"Jet-Model"”.
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Wall jet model for ceiling fan applications in broiler houses
A model was developed to predict velocity profiles of radial wall jets produced by ceiling fans and flowing over broiler chickens. Broilers were modeled by balloons with paper cylinders simulating the necks. Wall jet data was recorded for 91.5, 83.8 and 71.1 cm radius fans that were rated at 220, …
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The rise and dilution of buoyant jets and their behaviour in an internal wave field
A new buoyant jet model is presented in this thesis to simulate the trajectory and dilution of a fluid from a single port or line source. The new features include: A generalised derivation of the governing equations so that buoyant jets discharged from a source of any shape can be modelled within …
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The effect of entrainment on jet impingement heat transfer
… transfer to a single, plane, turbulent impinging jet. Solutions to the momentum and energy equations were obtained with similarity and series analyses. The analytical model is compared with measured heat transfer rates to single air jets impinging normally on an isothermal heated surface. To …
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Optical variability of radio-luminous palomar-green quasars
The goal of this project is to test the shocked jet model for quasar variability at optical wavelengths. The ten quasars with the highest radio core luminosity at 5 GHz in the Palomar Bright Quasar Survey were selected for this monitoring program; Seven out of the ten radio-luminous quasars …
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Morphodynamics of Ebb-Tidal Deltas
… delta in the field. A semi-analytical ebb-jet model, which was coupled to an exploratory morphological model, was developed and used to explore the interactions between tidal currents, waves, and morphology, and to test the sensitivity of morphological development and response to changes in …
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Predicting eddy detachment from thin jets
Using a semi-geostrophic, reduced gravity thin jet model, we analytically study the evolution of initial meanders into pinched-off rings. The model used is similar to the path equation developed by Flierl and Robinson {1984) for vertically coherent meanders. However, in the present model, the …
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Determining the jet opening-angle of gamma-ray bursts
… GRBs? In this thesis, we use a phenomenological model to determine [theta], the opening angle of the beams of GRBs. Our basic underlying assumption is that objects like SN 1987A are hypernovae, i.e., that they produce certain GRBs. We calculate [theta] by deriving two expressions for the …
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Dynamics of the Antarctic circumpolar current : evidence for topographic effects from altimeter data and numerical model output
Geosat altimeter data and numerical model output are used to examine the circulation and dynamics of the Antarctic Circumpolar Current (ACC). The mean sea surface height across the ACC has been reconstructed from height variability measured by the Geosat altimeter, without assuming prior knowledge …
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The optical polarization variability of the blazar PKS 2155 304
… driven by the magnetic field of a relativistic jet. PKS 2155–304 is an archetypal blazar, located in the southern hemisphere. The source is bright and highly variable, displaying both active and quiescent states. In this thesis I make use of optical polarization and multiwavelength observations …
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A theoretical study of relativistic jets and accretion processes
… work explores different aspects of the disc:jet connection in X-ray binaries. There is a detailed description of a new jet model (iShocks) that is used, firstly, to address the re-energization problem in the conical jet geometries. The adiabatic energy losses suffered by conical jets are …
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Simulations of active galactic nucleus feedback in the cores of galaxy clusters
This thesis focuses on developing a new subgrid model and studying feedback from active galactic nuclei (AGN) using adaptive mesh refinement (AMR) hydrodynamics simulations of the cores of galaxy clusters. Modeling of feedback from AGN that consist of central super-massive black holes (SMBH) in …
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The complex interplay between AGN jet feedback and galaxy evolution
… the presence of collimated, relativistic jets as well as powerful, multiphase winds emanating from these active galactic nuclei (AGN). Whilst the clearest observational signatures of AGN jet feedback are found in galaxy clusters, there is growing evidence that these jets are, in fact, …
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Formation and extraction of a dense plasma jet from a helicon-plasma-injected inertial electrostatic confinement device
… its application to fusion, the asymmetric grid jet-mode has its own potential application for electric space propulsion. The jet-mode gets its name from the characteristic bright plasma jet emanating from the central grid. In this dissertation work, a full study was undertaken to provide an …