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 146 for “"Hot-Wire"”.
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Hot-wire sensing of a micro-jet flow
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, February 2002.
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Hot-Wire Anemometer for the Boundary Layer Data System
<p>Hot-wire anemometry has been routinely employed for laboratory measurements of turbulence for decades. This thesis presents a hot-wire anemometer suitable for use with the Boundary Layer Data System (BLDS). BLDS provides a unique platform for in- flight measurements because of its small, …
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An oscillating hot wire for measurements in separated flows
An oscillating-hot-wire system is developed to allow mean-flow velocity measurements in separated flows. Disturbance velocities can also be measured in regions of interest. An oscillating-arm assembly provides a directional bias to the hot-wire probe, and a linear-step assembly steps the probe …
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Constant Voltage Hot-Wire Anemometry for the Boundary Layer Data System
… Layer Data System (BLDS), a constant voltage hot-wire anemometer (CVA) is implemented into the BLDS for flight-testing. The hot-wire anemometer was chosen as an alternative to the traditional pressure probe because of the ability to measure both average velocity and fluctuating velocity within …
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Kinetic Roughening During Hot-Wire Chemical Vapor Deposition of Hydrogenated Amorphous Silicon
… results from their action. In this dissertation, hot-wire chemical vapor deposition is used to deposit a-Si:H thin films. Both post-deposition atomic force microscopy (AFM) and in situ spectroscopic ellipsometry (SE) are used to characterize the surface morphology and its dynamics. Results of this …
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Unsteady hot-wire and hot-film wake measurements of automobile-like bluff bodies
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1990.
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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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Visualisation of dynamic flow processes using a novel pulsed multi-element hot-wire anemometer.
… the development of a novel Single-Element Pulsed Hot-Wire Anemometer (SEPWA) and its multi-element applications to fluid flow visualisation. Unlike previous pulsed anemometers which have separate heating and sensing wires, the methods described here utilise a single wire as both heater and sensor. …
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Electromagnetic modeling of hot-wire detonators using analytical and numerical methods with comparison to experiment
The electromagnetic (EM) characteristics of hot-wire detonators are determined in order to quantify more precisely their response to EM illumination. The analyses include a comprehensive study of detonators physical characteristics, which is then used to model detonators using transmission line …
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Synthesis and characterisation of doped silicon nanoparticles by hot wire thermal catalytic and spark pyrolysis
… bottom-up production processes were utilised: hot wire thermal catalytic pyrolysis and spark pyrolysis. The latter is a new process,developed as part of this research for silicon nanoparticle synthesis. In each method silicon nanoparticles were synthesised using mixtures of silane and phosphine …
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The use of hot-wire anemometry in studying supersonic slot injection into a supersonic flow
… air stream (M = 2.91) was studied with a dual hot wire probe. This probe was used to simultaneously determine total temperature and mass flux. Mean profiles across the entire flow field at three axial stations (x/h = 4, 10, 20) were obtained, as well as the temperature and mass flux turbulence …
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Hot-wire chemical vapour deposition of nanocrystalline silicon and silicon nitride : growth mechanisms and filament stability
… mechanisms and the filament stability during the hot-wire chemical vapour deposition (HWCVD) of nc-Si:H and SiNₓ thin films. During the HWCVD of nc-Si:H, electron backscatter diffraction (EBSD) revealed that the tantalum (Ta) filament aged to consists of a recrystallized Ta-core with Ta-rich …
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A study of hydrogenated nanocrystalline silicon thin films deposited by hot-wire chemical vapour deposition (HWCVD)
… application have been deposited by means of the hot – wire chemical vapour deposition (HWCVD) technique and have been characterised for their performance. It is noticed that hydrogenated nanocrystalline silicon is similar in some aspects (mainly optical) to its counterpart amorphous silicon …
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Determination of the gas-flow patterns inside the hot-wire chemical vapor deposition system, using computational fluids dynamics software (fluent)
… and Hydrogen gas (H2)) are delivered into the hot-wire chemical vapor deposition system (HWCVD) with the two deposited substrates (glass and Silicon). This process is performed by the solar cells group of the Physics department at the University of the Western Cape. In this thesis, the …
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Application of the Transient Hot-Wire Technique for Measurement of Effective Thermal Conductivity of Catalyzed Sodium Alanate for Hydrogen Storage
… A transient technique employing a platinum hot-wire is used to make the measurements. A cylindrical experimental apparatus was designed with the aide of a finite element model that was used to quantify the cylinder boundary effects. The apparatus dimensions were optimized based on the finite …
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Electrical characterisation of simple a-Si:H and nc-Si devices on paper substrates deposited by hot wire chemical vapour deposition and printing techniques
… amorphous silicon (a-Si:H) obtained by hot wire chemical vapour deposition (HWCVD), and printed nanocrystalline silicon (nc-Si), both deposited on a flexible, lightweight substrate of 80 g m-2 wood-free paper. For different devices such as field effect transistors and n-i-p solar cells, …
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Point Doppler velocimetry measurements in circular jets
… technique with capabilities that are similar to hot wire anemometry, but without inserting a probe into the flow. The insertion of a probe into a flow can affect the flow, resulting in inaccurate measurements.;PDV measurements for 1 inch diameter standard, swirling, and annular jets have been …
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