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 10 of 10 for “"Gas film"”.
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Study of squeeze action damping of gas film
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1962.
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Investigation of signal shape effects on the gas film in spark-assisted chemical engraving
… intricate control requirements linked to the gas film surrounding the tool present a significant challenge in SACE. While several studies have explored the influence of SACE parameters on the gas film, there exists a literature gap regarding the impact of voltage signal shapes on this film. …
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The Impact Dynamics of Weakly Charged Droplets
… upon which a thin convex lens shape layer of the gas film is typically formed, I show that the delicate gas thin film can be fundamentally altered for even weakly charged droplets both experimentally and numerically. As the charge level is raised above a critical level of about 1% of the Rayleigh …
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Modeling, estimation and control of mechanical gas face seal systems
"The existing methods to study mechanical gas face seals are computationally intensive or have limitations due to linearized description of the gas film coefficients. This dissertation develops modeling, estimation and control methods for mechanical gas face seal systems that overcome the …
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Designing a Membrane Module for Determining the Permeance of High Fluxing Membranes and the Testing RTIL-Membranes for Dehumidification.
Membrane-based gas dehumidification can have technical energy, and economical advantages over other dehumidification technologies. Because, it is simple to install, ease to operate, and take low process cost. Removal of water vapor from gases constitutes a significant expenditure of energy in our …
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Mass transfer coefficients and effective area of packing
… mass transfer area (a [subscript e]), liquid film mass transfer coefficient (k [subscript L]), and gas film mass transfer coefficient (k [subscript G]) of eleven structured packings and three random packings were measured consistently in a 0.428 m packed column. Absorption of CO₂ with 0.1 …
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Macro-scale investigation of high speed gas bearings for MEMS devices
… test facility for investigating high-speed gas bearings for MEMS devices such as the MIT Micro-Engine is presented along with results from subsequent experiments. It is shown that the bearings required by such MEMS devices fall outside the usual range of design parameters for conventional …
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The morphology of spray-dried particles
… solutes were dependent on drying temperature. Gas-film heat and SDSS transfer coefficients of single pure liquid droplets were also measured over a temperature range of 50•C to 200•C under forced convection. Balanced transfer rates were obtained attributed to droplet instability or oscillation …
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Real-time process monitoring of Spark-Assisted Chemical Engraving (SACE) machine with data-driven techniques
… However, inherent uncertainties arising from gas film instability and the stochastic nature of the process lead to inconsistencies and reduced repeatability in machining quality. Addressing these challenges requires precise online control of the process to improve machining efficiency—an …
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Electrospun nanofibrous metal oxides as regenerable adsorbents for desulfurization of biomass-derived syngas
Gasification of biomass residue, a thermochemical conversion process, is fast becoming an attractive method of syngas production by extracting energy from the non-food based biomass feedstocks. Unlike the more popular biochemical processes, like fermentation of cellulosic biomass, it can operate …