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 823 for “"Heat flux"”.
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Comparison of heat flux standards for calibrating heat flux gages at elevated temperatures and high heat flux levels
… a set of standards for use in calibrating heat flux gages at elevated temperatures in a radiant heat transfer environment by comparing several "trial" standards. Ideally, the same incident heat flux is derived from each standard when exposed to the same heat source. Three heat flux …
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The effect of nonuniform axial heat flux distribution on the critical heat flux.
Massachusetts Institute of Technology. Dept. of Nuclear Engineering. Thesis. 1966. Sc.D.
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Direct Measurement of Boiling Water Heat Flux for Predicting and Controlling Near Critical Heat Flux
A novel method for measuring heat flux of boiling water is designed and built to study critical heat flux (CHF) and observe the response of a heat flux sensor when CHF occurs. A high temperature heat flux sensor is embedded in the wall of a pipe to get a direct measurement of the surface heat flux …
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Post critical heat flux heat transfer.
Thesis. 1976. Sc.D.--Massachusetts Institute of Technology. Dept. of Mechanical Engineering.
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Critical heat flux in countercurrent flow.
Massachusetts Institute of Technology. Dept. of Mechanical Engineering. Thesis. 1974. M.S.
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Thermal hydraulics of high heat flux components
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1995.
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Unsteady surface heat flux and temperature measurements
A fast response thin-film heat flux sensor was used to measure the time-resolved surface heat flux and temperature from a turbulent combustion flame impinging on a surface. Using the analytical semi-infinite conduction model, the unsteady surface heat flux was calculated from the transient …
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Experimental surface heat flux measurement in hypervelocity flows
Prediction of heat transfer is integral to development of hypersonic vehicles. Underprediction of heat transfer rates can result in catastrophic failures during flight testing. An example which illustrates the importance of heat transfer during hypersonic flight is the destruction of the space …
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Feedforward temperature control using a heat flux microsensor
The concept of using heat flux measurements to provide the input for a feedforward temperature control loop is investigated. The feedforward loop is added to proportional and integral feedback control to increase the speed of the response to a disturbance. Comparison is made between the feedback …
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Development and calibration of a heat flux microsensor
… and calibration of a new type of layered heat flux gage is described. Using thin-film microfabrication techniques the gage design is able to combine many of the desirable characteristics of other previous gage designs to produce a gage that has a very small size, high frequency response, …
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Artificial Anisotropy for Transverse Thermoelectric Heat Flux Sensing
… describes the relationship between the flow of heat and electricity. Two main categories encompassed in thermoelectric theory are the Seebeck and Peltier effects. The Seebeck effect is the generation of a voltage in a device that consists of two different materials in the presence of a …
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Latent heat flux and South African summer rainfall variability
… if a relationship exists between oceanic latent heat flux and the summer rainfall of South Africa. Such a link would be useful for a better understanding and the prediction of monthly variability in the summer rainfall for South Africa. In order to investigate possible relationships between …
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Subcooled critical heat flux for water in round tubes,
Massachusetts Institute of Technology. Dept. of Naval Architecture and Marine Engineering. Thesis. 1965. Nav.E. (Also M.S. in Mechanical Engineering).
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Spectral correlation tests of an eddy heat flux parameterization
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Meteorology, 1979.
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Transverse Thermoelectric Effects for Cooling and Heat Flux Sensing
… thermoelectric effects for localized cooling and heat flux sensing. Thermoelectric cooling devices are useful when their advantages (small size, solid state, active temperature control) outweigh their relatively poor efficiency. Transverse heat flux sensors, which generate an electric field in a …
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Nanofluids and critical heat flux, an experimental and analytical study.
Nanofluids and critical heat flux, an experimental and analytical study.
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The unsteady combustion of radiant heat flux-driven energetic solids
… of energetic materials under dynamic radiant heating. Analysis has been carried out under the assumptions of quasi-steady gas and surface reaction, homogeneous propellant, and one-dimensional flame (QSHOD theory). Further, the assumption of a quasi-steady surface reaction was relaxed to …
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Determination of pool boiling Critical Heat Flux enhancement in nanofluids
… Using an electrically controlled wire heater, pool boiling Critical Heat Flux (CHF) of Alumina and Silica water-based nanofluids of concentration less than or equal to 0.1 percent by volume were measured. Silica nanofluids showed CHF enhancement up to 68% and there seems to be a …
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Evaporation from nanoporous membranes for high heat flux thermal management
Heat dissipation is a critical limitation in a range of electronic devices including microprocessors, solar cells, laser diodes and power amplifiers. The most demanding devices require dissipation of heat fluxes in excess of 1 kW/cm2 with heat transfer coefficients more than 30 W/cm 2K. Advanced …
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