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 72 for “"plenum"”.
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Plenum-to-plenum heat transfer characteristics under natural circulation in a scaled-down prismatic modular reactor
<p>“Gas-cooled reactor (GCR) is being developed under the Next Generation Nuclear Plant Program (NGNP) in nuclear engineering studies. As the world searches for an energy source with high energy density, clean, abundant, and storable nature to avoid global warming issues, GCR seems to be a …
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Heat loss in MHTGR upper plenum
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1991.
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Two dimensional diffusers with plenum and tailpipe discharge.
Two dimensional diffusers, both with and without tailpipes, have been tested with different inlet boundary layer conditions and various diffuser geometries. The effect on the developing boundary layer parameters within the diffuser and tailpipe are investigated for the various conditions. The …
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The numerical investogation of a bank of delta plenum air-cooled heat exchangers
Word processed copy. Includes bibliographical references (p. 102-105)
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Swirling jets for the mitigation of hot spots and thermal Sstratification in the VHTR lower plenum
… stratification and hot spot issues in the lower plenum (LP). This research hypothesizes that the complex thermalhydraulic phenomena in the LP requires a sophisticated computational fluid dynamics (CFD) code with state-of-the-art turbulence models and advanced swirling jet technology to mitigate …
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Unique airflow visualization techniques for the design and validation of above-plenum data center CFD models
… fluid dynamics (CFD) model. Most above-plenum data center CFD models are only validated using temperature data. Although a temperature-only validation method can be useful, it does not confirm that the airflow patterns predicted by the CFD model are accurate. Since the airflow patterns …
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Economic performance of modularized hot-aisle contained datacenter PODs utilizing horizontal airflow cooling
… Traditional data centers employ a raised floor plenum structure to deliver cooling via perforated floor tiles as the primary delivery system for component cooling. Heated exhaust air exits the equipment and travels upward to warm return plenum structures for subsequent capture and re-cooling. …
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Experimental investigations of natural circulation in a separate-and-mixed effects test facility mimicking prismatic modular reactor (PMR) core
… PMRs. To address this need, a separate effects Plenum-to-Plenum Facility (P2PF) was designed and developed with dual channels and plena for experimental investigations of naturally driven gas thermal and velocity fields under different circulation intensities. Thermal and velocity measurements …
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Effects on Heat Transfer Coefficient and Adiabatic Effectiveness in Combined Backside and Film Cooling with Short-Hole Geometry
… The results are compared to a conventional plenum fed case. Data were collected up to X/D =23 where X=0 at the holes, an S/D = 1.65 and L/D=1,2. Testing was done at low L/D ratios since short holes are normally found in double wall cooling applications in turbine components. A DR of 2 was …
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Modelling of the degradation of mechanical properties of glass fiber reinforced composites (GFRP) due to environmental aging
… Pack (ACP) of ECS, and more specifically on the plenum component of ACP. Plenum is a critical component of ACP, a diffuser-outflow chamber for the ram air and is heavily exposed to hydrothermal ageing in the presence of mechanical loading. The proposed methodology is based initially on the …
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Fiber Optic Sensing of Strain and Temperature for Structures in a Hypersonic Flow
… panel surface, which formed the boundary of a plenum cavity. This thin panel is subjected to a shock wave generated by a finned flat plate structure at certain flow speeds and specific orientations of this finned structure. FBG sensors were used to collect the resulting strain and temperature …
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CFD Modeling and Simulation of Natural Circulation in Helium- Cooled Very High Temperature Reactors
… College of New York. The setup consists of a plenum-to-plenum flow loop with four riser and four downcomer tubes, each equipped with heating coils, thermocouples, and pressure sensors. Natural circulation is driven by density gradients induced by asymmetric heating of the riser and downcomer …
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Air Ingress and Heat-Driven Flow Relaminarization in a Very High Temperature Reactor (VHTR)
… nitrogen and helium concentrations in the lower plenum and upper plenum. The changes in the nitrogen concentration in the upper plenum were used to calculate the time required for the transport of nitrogen from the lower plenum to upper plenum through a riser flow channel made of graphite. The …
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Preliminary experiment and analysis of supersonic inlet buzz
… was suggested. A basic theoretical shock-plenum system was developed to simulate the inlet buzz behavior and identify its controlling mechanisms. This nonlinear model was governed by the non-stationary shock wave relation, the plenum chamber mass balance, and the entrance blocking effect, …
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Oil flow from compressor valve to discharge tube
… shows the how oil enters into the compressor plenum. High speed videos are taken to look at the valve and the discharge tube in order to get the oil droplet size and velocity. Due to the difficulty of flow visualization in the plenum space, computational fluid dynamics (CFD) is used to …
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A theoretical study of the performance of resistojet nozzles
… are presented for H2, CH4, CO2 and NH3 for plenum temperatures extending from 300 to 3000°K and plenum pressures from 200 to 10 kNm-2. A wide variety of nozzle geometries is also considered. The results are compared with the predictions of the slender channel model of Rae and with …
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Experimental investigation of mist flow generated by reed valves in compressor discharge
… Between the discharge port and the discharge plenum or volume in compressors there is usually a valve. The most common type of discharge valve in AC&R compressors is a reed type valve. The mist flow characteristics such as droplet size, drop velocity are determined by obtaining high speed …
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Study of Skin Friction and Surface Regression Interaction via the Naphthalene Sublimation Technique
… runs at Mach 2.31. This process was repeated at plenum pressures of 0.35 MPa and 0.69 MPa, which correspond to Reynolds Numbers of 1.4x10^7/m and 2.8x10^7/m. Between the first and final run, a -4.7% and -3.7% percent change in the coefficient of friction was seen at the 0.35 MPa and 0.69 MPa …
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Experimental study of natural convection heat transfer and gaseous dynamics from dual-channel circulation loop
… very high-temperature reactor (VHTR) such as plenum-to-plenum heat transfer and gaseous dynamics during natural circulation. Natural circulation of the coolant is the leading capability for VHTR to transport the decay heat from the core to the reactor vessel during accident scenarios. To …
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Design and construction of test apparatus for SO₂ adsorption research
… design. The apparatus consists of an air-drying plenum, centrifugal fan, heat exchanger, mixing/adsorbing column, exhaust unit, and devices for pressure, temperature, SO₂-concentration, and flow measurement. A detailed description of the apparatus is included. The initial system start-up …
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