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 264 for “"Microchannel"”.
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An experimental facility for microchannel research and evaporating R134a in microchannel tube
Microchannel research is important for heat exchanger design. Heat transfer coefficient and pressure drop are the two most important parameters to be measured in an experimental facility. A featured design of heat transfer behavior and pressure drop testing facility for both evaporating and …
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Performance and optimization of microchannel condensers
… heat transfer performance of small diameter, microchannel tubes in crossflow heat exchange, and this study provides the first systematic evaluation of the effect of port shape on microchannel tube performance. Furthermore, this study is the first to suggest methods for improving microchannel …
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Periodic reverse flow in microchannel evaporators
… scale heat removal applications, for instance, microchannel heat sinks for cooling of electronics. Due to the industry’s strict requirement for thermal stability, previous research on flow instabilities in microchannels has been largely focused on heat sinks for electronic cooling. There is a …
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Development of a microchannel reactor model
… hydrogen in an on-board fuel processing system. Microchannel reactors have reduced mass and heat transfer limitations and are able to exploit fast intrinsic kinetics. Also, their high surface area to volume ratio reduces their size for a constant throughput, increasing their potential for …
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Suspended microchannel resonators for biomolecular detection
… and frequency resolution of the suspended microchannel resonator is not degraded by the presence of the fluid. Our device differs from a vibrating tube densitometer in that the channel is very thin, and only molecules that bind to the walls can build up enough mass to be detected; this …
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Forced-convection, liquid-cooled, microchannel heat sinks
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1987.
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Bubble dynamics on structured surface in microchannel
… to improve the performance of flow boiling in microchannels, which is considered to be one of the most promising cooling methods to solve thermal management challenges faced by future semiconductor products. Considerable research has been done on examining the functions of engineered surfaces. …
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Pressure drop in headers of microchannel heat exchangers
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-05-01
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Microchannel flow fields for polymer electrolyte fuel cells
… range. This study investigated the use of a microchannel flow field design (channel hydraulic diameters of less than or equal to 200 ìm) for a low temperature PEFC. Specifically it focused on the effect of using a microchannel design on overall fuel cell performance, pressure drop and the …
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Suspended microchannel resonators for ultralow volume universal detection
… the unique scaling properties of the suspended microchannel resonator (SMR) are exploited to show universal detection in a 10 pL analysis volume with a density detection limit of ~1 ([mu]g/cm³ (10 Hz bandwidth) and a linear dynamic range of six decades. Analytes with low UV extinction …
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MERLIN : a multiprocessor design for a MicroChannel architecture
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1989.
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Al/Al2O3 microchannel plasma chemical reactor for ozone synthesis
… and generated within alumina (Al2O3) microchannels. The array of microchannels device is fabricated from aluminum foil by chemical processing and mechanical ablation with photolithographic steps. Channels with 3 cm in length and 250 μm in width at the aperture of the channel produce …
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The void fraction in headers of microchannel heat exchangers
In HVAC&R systems, microchannel heat exchangers (MCHEs) are commonly used with the advantages of compactness, the potential for reduction of charge, and improvement of heat transfer performance compared to other traditional heat exchangers. The void fraction in the headers affects the thermal …
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Development of a zeolite washcoating technique for microchannel reactors
Microreactor technology is becoming an increasingly active research field in terms of chemical reaction engineering and process intensification. An important feature of microreactor technology is the requirement of a catalyst layer.
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Design of a microbreather for two-phase microchannel devices
Multiphase flows in microchannels are encountered in a variety of microfluidic applications. Two-phase microchannel heat sinks leverage the latent heat of vaporization to offer an efficient method of dissipating large heat fluxes in a compact device. In microscale methanol-based fuel cells, the …
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Label-free buoyant mass assays with suspended microchannel resonators
… the potential for such applications. Suspended microchannel resonators (SMRs) are highly sensitive, batch-fabricated microcantilevers with embedded microchannels that can measure mass with femtogram precision. Biomolecules such as proteins and nucleic acids are denser than water, and their …
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Measuring single-cell density using serial suspended microchannel resonators
… density at the single-cell level using suspended microchannel resonators by weighing the same cell in fluids of different densities. Here we describe a high-throughput version of this approach, in which cells are weighed sequentially in three cantilevers containing fluids of different densities. …
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Piezoelectric flexing and output voltage of a microchannel heat engine
… a piezoelectric membrane and fluid motion in a microchannel heat engine. A new slug flow model is developed for droplet motion in a circular cross-section channel. The model includes friction, pressure, viscous and thermocapillary forces on the droplet. This thesis examines the concept of a …
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Disinfection of wastewater for reuse using microchannel plasma ozone generator
… performance of an energy efficient and compact microchannel plasma-based ozone generator to inactivate L. pneumophila for safer water reuse. Inactivation kinetics study quantified the inactivation. More than four Log10 of L. pneumophila inactivation was achieved within 1 minute at low energy …
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