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 25 for “"heat flux measurements"”.
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Condensation heat flux measurements in ambient conditions on superhydrophobic nanostructured surfaces
… be combined with non-wetting surfaces to enhance heat transfer, desalination, anti-icing and self-cleaning. Recently, superhydrophobic coatings have gathered attention with jumping droplets with the potential for self-cleaning applications and spot cooling on high powered applications. With new …
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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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Heat Flux Measurements from a Human Forearm under Natural Convection and Isothermal Jets
This work is an experimental study on heat transfer from a human arm and a model cylinder. Heat transfer from a human forearm to a large jet, representative of a building HVAC vent/outlet was studied using both an IR camera and a heat flux sensor. The isothermal jet was discharged horizontally from …
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The development of instrumentation for the support of skin friction and heat flux measurements
… of skin friction gages and a microfabricated heat flux gage. Design changes for the skin friction gages are presented which will improve the performance of the two transducers. The instrumentation is simple in design and use and has been designed to maximize the performance of the skin …
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Coupling of Fluid & Solid Thermal Models to Correct Heat Flux Measurements Taken on Launch Vehicles
<p>Knowledge of aerothermally induced convective heat transfer and plume induced radiative heat transfer loads is essential to the design of thermal protection systems (TPS) for launch vehicles. These loads are measured via the cylindrical heat flux gauges that are flush mounted with the outer …
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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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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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Natural convection heat transfer from a horizontal disk in a cylindrical enclosure
… in water from a horizontal mirror finished disk, heated in the center and surrounded by a cylindrical enclosure. The test section was designed to insure a one dimensional heat flux. Measurements were taken with power inputs varying from 25 to 5 watts. Fluid depth had a definite effect on the heat …
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A Generalized Model for Wall Flame Heat Flux During Upward Flame Spread on Polymers
… 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 Monte-Carlo optical workbench for radiometric imaging system design
… 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 satellite …
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Effects of freestream turbulence on turbine blade heat transfer in transonic flow
… grid generated freestream turbulence on surface heat transfer to turbine blades were measured experimentally. Time-resolved and unsteady heat flux measurements were made with Heat Flux Microsensors at two positions on the suction side of turbine blades. The experiments were conducted on a …
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Measurements of thermal properties and blood perfusion using the heat flux microsensor
A thin-film heat flux sensor was used in two transient conduction applications. First it was used in a device for simultaneously determining the thermal conductivity, κ, and the thermal diffusivity, α, of solid materials. The device was heated and then touched to metal samples at room temperature. …
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Effects of shock wave passing on turbine blade heat transfer in a transonic turbine cascade
… wave passing through a blade passage on surface heat transfer to turbine blades were measured experimentally. The experiments were performed in a transonic linear cascade which matched engine Reynolds number, Mach number, and shock strength. Unsteady heat flux measurements were made with Heat …
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Design of a supersonic shock tunnel and experimental surface measurements
… being ambient air. Pressure and temperature measurements were made to document the operating conditions of the tunnel. Total pressure measurements were made in the settling chamber of the nozzle where the flow Mach number is 0.14 (weakly subsonic). Static pressure measurements were made at …
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Computational and Experimental Modeling of the Bioheat Transfer Process of Perfusion in Tissue Applied to Burn Wounds
… estimation routine using surface temperature and heat flux measurements to estimate blood perfusion and thermal resistance in living tissue. Dynamic thermal measurements collected at the surface of the sensor before and after imposing a dynamic thermal cooling event are used with the model to …
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Low coronal signatures of coronal mass ejections: coronal “waves” and dimmings
… Sun being maintained as indicated by electron heat flux measurements at 1 AU.
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Implications of the Dense City Centre to Surface-Atmosphere Exchanges
… is on the controls on radiation, anthropogenic heat and the turbulent latent and sensible heat fluxes. The impact of the composition and three-dimensional structure of the urban surface, plus the associated anthropogenic activities, are investigated using remote sensing techniques, in-situ …
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Effects of stationary wake on turbine blade heat transfer in a transonic cascade
… by a stationary upstream strut on surface heat transfer to turbine blades were measured experimentally. Time-resolved and unsteady heat flux measurements were made with Heat Flux Microsensors (HFM) at three positions on the suction surface and one position on the pressure surface of a …
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The effect of flow structure on the combustion and heat transfer in a scramjet combustor
… operation characteristics, combustion, and heat transfer. Hydrogen was injected from the base of swept compression and expansion ramps in direct-connect tests that simulated flight at Mach 6.6. The experimental effort included combustor wall pressure and heat flux measurements with Gardon …
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Convective Heat Flux Sensor Validation, Qualification and Integration in Test Articles
… of this study is to quantify the effects of heat flux sensor design and interaction with both test article material choice and geometry on heat flux measurements. It is the public domain component of a larger study documenting issues inherent in heat flux measurement. Direct and indirect heat …
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