Aerodynamic shattering of liquid drops.
High velocity gas stream induced shattering of liquid drops, disintegration rate and breakup time
Nicholls, J. A.↗
SEARCH · Search NASA
Results for “GAS STREAM”
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.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
Quantitative conversion of water to carbon dioxide
Method quantitatively converts water vapor to carbon dioxide permitting direct and rapid analysis of mixed-gas streams for water content.
Warf, J. C.↗
Liquid-gas separator for zero gravity environment Patent
Absorbent apparatus for separating gas from liquid-gas stream used in environmental control under zero gravity conditions
Samonski, F. H., Jr.↗
Atomization characteristics of gas/liquid injectors.
Rocket engines gas/liquid injectors atomization characteristics using molten wax technique, considering drop sizes and gas streams velocity, density and pressure
Campbell, D. T.↗
Gaseous contaminant removal by adsorption. II
Breakthrough curve shape prediction during adsorption from gas stream in fixed bed adsorbers for trace contaminant control applied to activated charcoal
Merrill, R. P.↗
High-speed rarefied gas flow near a stagnation point with application to sphere drag
Hypersonic rarefied gas flow near stagnation point investigated to predict drag on sphere in high speed gas stream with densities in transition regime
Liu, C. Y.↗
The absorption of carbon dioxide by weak base ion exchange resins
Carbon dioxide absorption from gas streams by weak base ion exchange resins
Gregor, H. P.↗
Turbulent mixing film cooling correlation
Film cooling effectiveness correlation predicts air flow requirement for cooling gas turbine combustors. Turbulent mixing model accounts for mixing rate between cooling film and hot gas stream. Resulting equation correlates data within plus or minus 20 percent.
Juhasz, A. J.↗
Oscillating hot-wire anemometer
Performance analysis was made of oscillating hot-wire anemometer electrical output in gas stream. Advantages include no calibration and measurement of fluid direction as well as fluid speed.
Conley, J. M.↗
A multielement probe for coincident temperature and pressure measurements
Small, multielement probes are described which measure total pressure and temperature coincidentally at one or several points in gas stream.
Glawe, G. E.↗
Mach 1 oxidation of thoriated nickel chromium at 1204 C (2200 F)
TD NiCr was exposed to a Mach 1, 1-atmosphere gas stream at 1204 C for times up to 50 hours. Weight change, metal thickness loss, X-ray diffraction, metallographic, and electron microprobe analyses were made. Neither surface preparation nor thermal cycling had an appreciable effect on the results. Initially, Cr2O3 formed and volatilized, allowing a rapid metal loss rate of 40 microns per hour. After about 1 hour the Cr2O3 broke down, resulting in an NiO overgrowth. The metal loss rate then slowed to 2.5 microns per hour and remained constant to 50 hours.
Lowell, C. E.↗
Thin film oxygen partial pressure sensor
The development is described of a laboratory model oxygen partial pressure sensor using a sputtered zinc oxide thin film. The film is operated at about 400 C through the use of a miniature silicon bar. Because of the unique resistance versus temperature relation of the silicon bar, control of the operational temperature is achieved by controlling the resistance. A circuit for accomplishing this is described. The response of sputtered zinc oxide films of various thicknesses to oxygen, nitrogen, argon, carbon dioxide, and water vapor caused a change in the film resistance. Over a large range, film conductance varied approximately as the square root of the oxygen partial pressure. The presence of water vapor in the gas stream caused a shift in the film conductance at a given oxygen partial pressure. A theoretical model is presented to explain the characteristic features of the zinc oxide response to oxygen.
Wortman, J. J.↗
Influence of porous-wall thermal effectiveness on turbulent-boundary-layer heat transfer
In view of the interest in employing porous wall materials for which the wall thermal effectiveness is less than unity, the influence of the effectiveness on the convective heat-transfer coefficient is examined. A Couette-flow model of the turbulent boundary layer shows that the familiar expression for the Stanton number with mass transfer at the boundary is modified by a correction factor that accounts for the wall thermal effectiveness and the effectiveness of the film layer in protecting the surface from the hot gas stream. The correction term is found be of considerable importance for low values of blowing rate and wall thermal effectiveness.
Lecuyer, M. R.↗
Practical application of computer programs for supersonic combustion
Experimental data were interpreted using two supersonic combustion computer programs. The P1 program is based on a conventional boundary layer treatment of the mixing of concentric gas streams and complete combustion chemistry. The H1 program is based on a modified boundary layer approach which accounts for radial pressure gradients in the flow and also incorporates a finite rate chemistry calculation. The objective of the investigation was to compare the experimental data with theoretical predictions of the two programs with special emphasis on the prediction of radial pressure gradients by the H1 program. A test of the H1 program was also desired through comparison with the experimental data and with the P1 program.
Groves, F. R., Jr.↗
Status of power generation experiments in the NASA Lewis closed-cycle MHD facility.
In this paper the design and operation of the closed-cycle MHD facility is discussed and results obtained in recent experiments are presented. The main components of the facility are a compressor, recuperative heat exchanger (preheater), heater, nozzle, MHD channel with 28 pairs of thoriated tungsten electrodes, cesium condenser, and an argon cooler. The heater can supply 1.1 MW of thermal power to a 2.27 kg/sec gas stream. The facility has been operated at temperatures up to 2100 K with a cesium-seeded argon working fluid. At low magnetic field strengths (B = 0.2 T), the open circuit voltage, Hall voltage and short circuit current obtained are 90, 69, and 47 percent of the theoretical equilibrium values, respectively. The Hall voltage and short circuit current decrease sharply with increasing magnetic field strength, however. Comparison of these data with a wall and boundary layer leakage theory indicates that the generator has shorting paths in the Hall direction.
Sovie, R. J.↗
Short-time oxidation of zirconium.
Study of zirconium oxidation kinetics for maximum exposure times of 3 min and in the temperature range 440 to 850 C. 'Discontinuous' oxidation runs were employed whereby a specimen was inserted into the gas stream for a predetermined time, removed and weighed, and reinserted into the oxidation atmosphere. It is considered that the increase in the observed activation energy for the early stage parabolic oxidation is a manifestation of a change from an n-type oxide to a predominantly p-type oxide, in agreement with the authors' earlier conclusion (1971) based on pressure effects.
Srivastava, L. P.↗
Further development and testing of the metabolic gas analyzer
Continued development of a metabolic monitor utilizing a mass spectrometer and digital computer to perform measurements and data reduction, is reported. The device prints-out breath-by-breath values for 02 consumption, C02 production, minute volume and tidal volume. The flow is measured by introduction of a tracer gas to the expired gas stream. Design modifications to reduce pressure drop in the flow splitter to one inch of water at 600 liters/min flow and to extend the range of linear flow measurement to 1000 liters/min are discussed.
Source record↗
Spectroscopic observations of the Cygnus X-1 optical candidate.
Data from nine high-dispersion spectra of HDE 226868, the optical candidate for Cyg X-1, are presented. The line profiles at He II (4686 A) show marked changes from night to night. Our data are not compatible with models where the emission line arises from the unseen secondary component of the system, as has been suggested by other observers. We propose that the emission originates in a gas stream falling toward the secondary; this provides observational evidence that the X-ray source is powered by accretion. We also see changes in spectral type and luminosity class with phase, further complicating attempts to make mass estimates for the system.
Smith, H. E.↗