Prediction of friction and heat-transfer coefficients with large variations in fluid properties
Prediction of friction and heat transfer coefficients with large variations in fluid properties
Taylor, M. F.↗
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Results for “heat transfer coefficient”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Measurement of local heat transfer coefficients for flow of hydrogen and helium in a smooth tube at high surface-to-fluid bulk temperature ratios.
Heat transfer coefficients for helium and hydrogen gas flowing through electrically heated Inconel tube
HYDROGEN↗
The Effect of Baffles on the Temperature Distribution and Heat-transfer Coefficients of Finned Cylinders
This report presents the results of an investigation to determine the effect of baffles on the temperature distribution and the heat-transfer coefficient of finned cylinders. The tests were conducted in a 30-inch wind tunnel on electrically heated cylinders with fins of 0.25 and 0.31 inch pitch. The results of these tests showed that the use of integral baffles gave a reduction of 31.9 percent in the rear wall temperatures and an increase of 54.2 percent in the heat transfer coefficient as compared with a cylinder without baffles.
Schey, Oscar W↗
Local heat-transfer coefficients for condensation of steam in vertical downflow within a 5/8-inch-diameter tube
Heat transfer coefficients of steam condensation in vertical downflow with liquid-vapor interface inside small tube-type condenser
CONDENSER↗
A new interpretation of internal heat transfer coefficients of porous media
The results of laser anemometer and flow visualization based fluid mechanics studies of porous media are used to obtain heat transfer coefficients for porous materials. Average pore flow Re ranging from 0.16-700 were examined. Darcy, inertial steady laminar, unsteady laminar and turbulent flow regimes were detected. A passage length model was devised to derive the heat transfer coefficient. Sample data from flows through porous metals composed of powders and fibers validated the passage length for Darcy and inertial flow regimes. Unsteady laminar and turbulent flow coefficients require the identification of new parameters.
Dybbs, A.↗
Average outside surface heat-transfer coefficients and velocity distributions for heated and cooled impulse turbine blades in static cascades
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Hubbartt, James E↗
Determination of Average Heat-transfer Coefficients for a Cascade of Symmetrical Impulse Turbine Blades I : Heat Transfer from Blades to Cold Air
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Meyer, Gene L↗
Laser Measurement Of Convective-Heat-Transfer Coefficient
Coefficient of convective transfer of heat at spot on surface of wind-tunnel model computed from measurements acquired by developmental laser-induced-heat-flux technique. Enables non-intrusive measurements of convective-heat-transfer coefficients at many points across surfaces of models in complicated, three-dimensional, high-speed flows. Measurement spot scanned across surface of model. Apparatus includes argon-ion laser, attenuator/beam splitter electronic shutter infrared camera, and subsystem.
Porro, A. Robert↗
Boiling heat transfer coefficients, interface behavior, and vapor quality in rotating boiler operating to 475 G's
Boiling heat transfer coefficients, interface behavior, and vapor quality in heated wall rotating boilers with continuous through-flow of water as test fluid
Gray, V. H.↗
A method of predicting heat transfer coefficients in the cooling passages of NERVA and Phoebus-2 rocket nozzles.
Heat transfer coefficients in rocket nozzle cooling passages predicted by equation developed from hydrogen flow experiments
Taylor, M. F.↗
Determination of Local Experimental Heat-Transfer Coefficients on Combustion Side of an Ammonia-Oxygen Rocket
Local experimental heat-transfer coefficients were measured in the chamber and throat of a 2400-pound-thrust ammonia-oxygen rocket engine with a nominal chamber pressure of 600 pounds per square inch absolute. Three injector configurations were used. The rocket engine was run over a range of oxidant-fuel ratio and chamber pressure. The injector that achieved the best performance also produced the highest rates of heat flux at design conditions. The heat-transfer data from the best-performing injector agreed well with the simplified equation developed by Bartz at the throat region. A large spread of data was observed for the chamber. This spread was attributed generally to the variations of combustion processes. The spread was least evident, however, with the best-performing injector.
Liebert, Curt H.↗
Experimental Technique and Assessment for Measuring the Convective Heat Transfer Coefficient from Natural Ice Accretions
A technique was developed to cast frozen ice shapes that had been grown on a metal surface. This technique was applied to a series of ice shapes that were grown in the NASA Lewis Icing Research Tunnel on flat plates. Nine flat plates, 18 inches square, were obtained from which aluminum castings were made that gave good ice shape characterizations. Test strips taken from these plates were outfitted with heat flux gages, such that when placed in a dry wind tunnel, can be used to experimentally map out the convective heat transfer coefficient in the direction of flow from the roughened surfaces. The effects on the heat transfer coefficient for both parallel and accelerating flow will be studied. The smooth plate model verification baseline data as well as one ice roughened test case are presented.
Masiulaniec, K. Cyril↗
Remote noncontacting measurements of heat transfer coefficients for detection of boundary layer transition in wind tunnel tests
An infrared measurement system is used that consists of a laser heating source, an infrared camera for data acquisition, and a video recorder for data storage. A laser beam is scanned over an airfoil, heating its surface to a few degrees above ambient. An infrared camera then measures the temperature of the airfoil over a two-dimensional field, and these temperatures are stored as a function of time on a video recorder. The resulting temperature pictures are digitized and an iterative approximation algorithm is used to extract the heat transfer coefficient. The resulting values are normalized to the natural convection condition. The technique has been applied in low-speed wind tunnel tests and compared to well-established hot-film measurements which were made simultaneously to confirm the flow conditions. Heat transfer coefficients were determined using a linear scanning pattern, to indicate the position of natural and of artificially induced transition on an airfoil, at various wind speeds. The technique is shown to be sensitive to transition at low Mach numbers. The advantages of the technique are discussed.
Heath, D. Michele↗
Determination of blade-to-coolant heat-transfer coefficients on a forced-convection, water-cooled, single-stage turbine
Blade-to-coolant convective heat-transfer coefficients were obtained on a forced-convection water-cooled single-stage turbine over a large laminar flow range and over a portion of the transition range between laminar and turbulent flow. The convective coefficients were correlated by the general relation for forced-convection heat transfer with laminar flow. Natural-convection heat transfer was negligible for this turbine over the Grashof number range investigated. Comparison of turbine data with stationary tube data for the laminar flow of heated liquids showed good agreement. Calculated average midspan blade temperatures using theoretical gas-to-blade coefficients and blade-to-coolant coefficients from stationary-tube data resulted in close agreement with experimental data.
COOLING - GAS TURBINE SYSTEMS↗
A method of predicting heat transfer coefficients in the cooling passages of NERVA and Phoebus-2 rocket nozzles
Predicting heat transfer coefficients in cooling passages of Nerva and Phoebus-2 rocket nozzles
Taylor, M. F.↗
Heat-transfer coefficients of pin-finned cylinders
Pin-finned cylinder can increase heat-transfer rate to more than 4 times that of plain cylinder, depending on pin diameter and spacing. Smallest diameter, closest spacing, and largest pin length-to-diameter ratio gives highest average effective heat-transfer coefficients.
Van Fossen, G. J., Jr.↗
Surface heat-transfer coefficients of finned cylinders
An investigation to determine and correlate the experimental surface heat-transfer coefficients of finned cylinders with different air-stream cooling arrangements was conducted at the Langley Memorial Aeronautical Laboratory from 1932 to 1938. The investigation covered the determination of the effect of fin width, fin space, fin thickness, and cylinder diameter on the heat transfer. Wind-tunnel tests were made in the free air stream with and without baffles and also with various devices for creating a turbulent air stream. Tests were also made with blower.
Ellerbrock, Herman H , Jr↗
Periodic steamwise variations of heat transfer coefficients for incline and staggered arrays of circular jets with crossflow of spent air
Heat transfer characteristics were measured for inline and staggered arrays of circular jets impinging on a surface parallel to the jet orifice plate. The impinging flow was constrained to exit in a single direction along the channel formed by the jet plate and the heat transfer surface. In this configuration the air discharged from upstream transverse rows of jet holes imposes a crossflow of increasing magnitude on the succeeding downstream jet rows. Streamwise heat transfer coefficient profiles were determined for a streamwise resolution of one-third the streamwise hole spacing, utilizing a specially constructed test surface.
Florschuetz, L. W.↗