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 44 for “"Radiation Heat Transfer"”.
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A zonal model for radiation heat transfer in coal-fired boiler furnaces
… is a key indicator of the combustion and heat transfer processes taking place and has a profound impact on the operation of the heat exchangers downstream of the furnace. Having a model that can predict the furnace exit temperature and heat flux distributions may enable furnace performance …
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The use of small cells to reduce radiation heat transfer in foam insulation
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1990.
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The use of coated micropowders to reduce radiation heat transfer in foam insulation
… of polyurethane foam insulation. Radiative heat transfer, which accounts for approximately 25% of the total heat transfer through foams, is inversely proportionate to the extinction coefficient. Foam cell walls presently have a transmissivity of about 80% to infrared radiation. The …
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Advances in Radiation Heat Transfer and Applied Optics, Including Application of Machine Learning
… This dissertation applies ANNs in the field of radiation heat transfer and applied optics. The topics of interest in this dissertation include both forward and inverse problems. Forward problems involve applications in which numerical simulation is expensive in terms of time consummation and …
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Estimation of thermal properties in a medium with conduction and radiation heat transfer
The simultaneous estimation of multi-mode heat transfer properties, conductive and radiative, is investigated for materials that include significant heat transfer by radiation. The focus is on insulative type materials with a relatively large optical thickness. Two basic models were developed for …
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Utilizing radiation heat transfer to increase the power density in a gas-cooled reactor
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1991.
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Uncertainty and Confidence Intervals of the Monte Carlo Ray-Trace Method in Radiation Heat Transfer
… to predict the uncertainty associated with radiation heat transfer problems solved using the Monte Carlo ray-trace method (MCRT). Four equations are developed to predict the uncertainty of the distribution factor from one surface to another, the global uncertainty of all the distribution …
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Near-field radiation in nanoscale gaps
The theoretical calculations for near-field radiation heat transfer based on a local dielectric constant approach indicate that the heat transfer will go to infinity as the gap becomes very small. To correct this anomaly, it has been proposed that the heat transfer through very small gaps will …
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Development of a quasi-dimensional diesel engine simulation for energy and availability analysis
… multi-zone combustion model and a radiation heat transfer model are developed for the study of turbocharged diesel engine performance and energy and availability balance. The quasi-dimensional multi-zone combustion model is based on the air and fuel mixing process with a temperature …
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Laminar burning velocity measurements of stabilized aluminum dust flames
… are thicker and brighter, may be influenced by radiation heat transfer, respond differently to heat losses, and are influenced by the particular flow configuration due to the particle's inertia. With the apparent sensitivity to a specific experimental apparatus, the introduction of a fundamental …
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A Scoping Study to Develop a Computational Fluid Dynamics Based Model to Predict Radiological Materials Packaging Temperatures within a Generic Staging Building
… building contains 640 drum-packages containing heat-generating, radiological material supported on four racks that are eight levels tall. Additionally, there is a forced ventilation system, lighting, and insulated walls. Computational models were constructed that included or excluded (a) …
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Preventing fuel failure for a beyond design basis accident in a fluoride salt cooled high temperature reactor
… by a liquid salt buffer; these salts limit core heatup while decay heat drops. The vessel insulation is designed to fail during a BDBA. The silo contains a frozen BDBA salt designed to melt and surround the reactor vessel during a major accident to accelerate heat transfer from the vessel. These …
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Characterisation of the effective thermal conductivity in the near wall region of a packed pebble bed
… parameter that is representative of the overall heat transfer in a packed bed of spheres. An accurate prediction of the effective thermal conductivity is necessary for the design and analysis of packed pebble bed gas-cooled reactors, especially when considering the safety case. The wall effect …
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Separação de misturas líquidas em escoamento pelicular por meio de radiação térmica
… the surface of a liquid film that flows over a heated inclined plate. The vapor condenses in contact with a cold plate, parallel to and on top of the first one, fornling also a liquid film. In the maciel are analysed a) the process of heat transfer through the films and the change of phase, as …
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A Monte-Carlo optical workbench for radiometric imaging system design
… engineering and to combine this knowledge with radiation heat transfer analysis to create a radiometric imaging design tool. In particular, the tool is aimed at design of reflective radiometric imaging telescopes, capable of highly accurate heat flux measurements, to be used in space-borne …
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Evaluation of zero-dimensional furnace models for biomass-fired boilers with the aid of CFD and plant measurements
… key challenge is accurately predicting waterwall heat uptake, furnace exit gas temperature (FEGT), and direct radiation impinging on downstream heat exchangers under varying operational conditions. Although radiation heat transfer is highly dependent on three-dimensional geometry, one-dimensional …
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Design and Simulation of Passive Thermal Management System for Lithium-Ion Battery Packs on an Unmanned Ground Vehicle
… ground vehicle was simulated with ANSYS Fluent. Heat generation rates and specific heat capacity of a single cell were experimentally measured and used as input to the thermal model. A heat generation load was applied to each battery and natural convection film boundary conditions were applied to …
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Numerical Modelling of LOX Droplet Combustion in Hydrogen under Micro-gravity Conditions
… with liquid droplet evaporation. The rate of heat transfer at the droplet is studied in both cases to couple them as a single numerical solution of droplet combustion. Radiation heat transfer is also considered, as an addition to the flame model to match the rate of heat transfer for droplet …
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Electrically-tunable near-field heat transfer with ferroelectric materials
Radiative heat transfer at small separations can be enhanced by orders of magnitude via the use of surface phonon polariton or plasmon polariton waves. This enhancement has potential applications in different devices, such as thermal emitters, thermal rectifiers, thermophotovoltaic and …
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1D and 3D simulation of a water cooled reactor cavity cooling system experimental facility
… (RCCS). This system is intended to remove decay heat from the reactor cavity. Designs exist for both air-cooled and water-cooled configurations. It operates completely passively and is designed to operate without external inputs. The accurate simulation of the phenomena in a reactor cavity …
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