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 49 for “"Surface Heat Flux"”.
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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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The simultaneous measurement of time-resolved surface heat flux and freestream turbulence at a stagnation point
Two rapid-response thin-film heat flux gage systems have been used to measure time-resolved unsteady heat transfer signals. The Heat Flux Microsensor is a passive gage which measures the temperature difference across a thin thermal resistance. The second sensor, an actively powered gage operated by …
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Near-wall reaction effects on film-cooled surface heat transfer
… ratios, there exists a potential for significant heat release to occur in the turbine if energetic species emitted from the combustor are further oxidized during interaction with film-cooling flows. Currently there is little basis for understanding the effects on aero-performance and durability …
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A frequency domain analysis of surface heat transfer/free-stream turbulence interactions in a transonic turbine cascade
The relationship of time-resolved surface heat flux to the turbulent free-stream flow over a turbine blade is investigated. Measurements are made in a transonic linear cascade with a modem high pressure turbine blade profile. Time-resolved direct heat transfer measurements are made with Heat Flux …
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Time-resolved heat flux measurements of the turbulent junction vortex system
A rapid-response thin-film heat flux sensor was used to measure time-resolved unsteady heat flux in a complex junction vortex flow. This sensor, called the Heat Flux Microsensor, was used with a hot-wire anemometer to make simultaneous measurements of velocity and surface heat flux. The results …
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The upper ocean response to the monsoon in the Arabian Sea
Estimation of the upper ocean heat budget from one year of observations at a moored array in the north central Arabian Sea shows a rough balance between the horizontal advection and time change in heat when the one-dimensional balance between the surface heat flux and oceanic heat content breaks …
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The upper ocean response to the monsoon in the Arabian Sea
Estimation of the upper ocean heat budget from one year of observations at a moored array in the north central Arabian Sea shows a rough balance between the horizontal advection and time change in heat when the one-dimensional balance between the surface heat flux and oceanic heat content breaks …
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Understanding the role of stochastic atmospheric forcing in tropical Pacific decadal variability and ENSO modulation
… is conducted with small time-invariant surface heat flux anomalies associated with the leading atmospheric modes in the extratropical South and North Pacific. The results show that subtropical ocean-atmosphere anomalies driven by the surface heat flux forcing propagate into the tropical …
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Computational Analysis to Enhance Laminar Flow Convective Heat Transfer Rate in an Enclosure Using Aerosol Nanofluids
… a starting point to effectively model aerosol heat transfer in a narrow, enclosed body. This research can lead to future modeling of nano fluids including their heat transfer characteristics and erosion effects on the walls of an enclosure. The model was developed using ICEM CFD for the mesh …
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Design of a supersonic shock tunnel and experimental surface measurements
… the maximum temperature attained in the flow. Surface heat flux measurements were made at the exit of the nozzle and compared with previous skin friction measurements. The measured pressures and temperatures compared well with the predicted values for the air driver. In the case of the test …
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Wind-driven circulation on a shallow, stratified shelf
… atmospheric forcing characteristics and the heat balance of the inner shelf, and are used as motivation for a numerical study of inner shelf circulation during upwelling and downwelling. Variation in meteorological forcing on the North Carolina Inner shelf is shown to be dominated by synoptic …
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The Development of Novel Apparatus, Systems, and Methods for Non-Invasive Thermal Interrogation (NITI)
… that uses simultaneous measurements of object surface heat flux and object surface temperature. When these measurements are combined with signal processing algorithms, such as parameter estimation routines or other techniques, they can be used to non-invasively determine the internal …
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A Generalized Model for Wall Flame Heat Flux During Upward Flame Spread on Polymers
A current model accurately predicts flame to surface heat flux during upward flame spread on PMMA based on a single input parameter, the mass loss rate. In this study, the model was generalized to predict the heat flux for a broad range of polymers by adding the heat of combustion as a second input …
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A Numerical Study of the Flow and Heat Transfer in the Near Field of a Cylindrical Bubble Moving in a Narrow Channel
… in a pressure-driven flow of Novec-649 in a heated channel. The upper wall is an electrically heated metal foil, and the bubble diameter is on the order of the channel spacing. Phase change is not included to isolate the contribution of the liquid motion to the heat transfer. The simulation …
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Quantification of the Fire Thermal Boundary Condition
The thermal boundary condition to a fire exposed surface was quantified with a hybrid heat flux gage. Methods were developed to determine the net heat flux through the gage, incident heat flux, cold surface heat flux, convective heat transfer coefficient, adiabatic surface temperature, and the …
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The effect of stratification on wind-driven, cross-shelf circulation and transport on the inner continental shelf
… of stratification, wind stress magnitude, surface heat flux, cross-shelf density gradient, and wind direction on the inner shelf response to the cross-shelf component of the wind stress. In well mixed and weakly stratified conditions, the cross-shelf density gradient can be used to predict …
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The effect of stratification on wind-driven, cross-shelf circulation and transport on the inner continental shelf
… of stratification, wind stress magnitude, surface heat flux, cross-shelf density gradient, and wind direction on the inner shelf response to the cross-shelf component of the wind stress. In well mixed and weakly stratified conditions, the cross-shelf density gradient can be used to predict …
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The flow structure under mixed convection in a uniformly heated vertical pipe
For decay heat removal systems in the conceptual Gas-cooled Fast Reactor (GFR) currently under development, passive emergency cooling using natural circulation of a gas at an elevated pressure is being considered. Since GFR cores have high power density and low thermal inertia, relative to the high …
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