Cooldown time for simple cryogenic pipelines.
Cooldown time for cryogenic pipelines, discussing analytical model based on enthalpy, density and velocity of sound in warm gas
Brennan, J. A.↗
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Results for “Enthalpy”
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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High pressure real gas effects for helium and nitrogen
Critical flow factor is calculated that permits the isentropic mass-flow rate of the gases through critical flow nozzles to be calculated from plenum conditions. Results include nozzle throat velocity, compressibility factor, entropy, enthalpy, specific heat, and ratios of throat to plenum pressure, density, and temperature.
Johnson, R. C.↗
An Analog Computer Study of the Low-Frequency Flow Dynamics of Two Nuclear-Rocket Cold-Flow Engine Systems
An analog computer study is made of the low-frequency flow dynamics observed with liquid hydrogen flowing in two different nuclear-rocket cold-flow (unfueled) engine systems. The prediction of the low-frequency response depends largely upon the generation of the proper mass-flow storage in the system. This is achieved by relating, in the model lumping, the average values of fluid enthalpy and a certain thermodynamic fluid property. A two-phase state equation is derived for thermodynamic equilibrium between the gas and liquid phases. Parametric studies are made which demonstrate the effect of the pump characteristics on the flow damping.
Fox, Harry W., Jr.↗
Research on the combustion mechanism of hybrid rockets
Investigations of the turbulent boundary layer with heat transfer, mass transfer, and chemical reactions are reviewed, with emphasis on recent studies motivated by the hybrid combustion problem. Relatively high mass injection rates and rapidly changing composition and enthalpy boundary conditions along the boundary layer edge are inherent to the hybrid problem, and earlier treatments are somewhat inconsistent with this situation. To account for these aspects, a more recent analysis reviewed here differs from earlier ones in the way the mass transfer number B, or thermochemical driving force, is related to the thermodynamic parameters of the propellants and flow and in the treatment of the heat transfer blocking effect caused by wall mass injection. It is shown that the present boundary layer analysis is applicable up to B 100, while the maximum thermochemical driving force available from any possible combination of propellants is less than 40. This analysis is used to predict the regression rate performance of several typical propellant combinations with good accuracy.
G A Marxman↗
Effect of shock precursor absorption on superorbital entry heating.
Quantitative determination of reentry shock precursor absorption level and effect on surface radiation heating, calculating radiative flux from shock layer enthalpy distribution
Lasher, L. E.↗
Dynamics of an explosive hot spot.
Gas dynamics effects of hot spot in explosive gas mixture using kinetic rate equations, discussing composition, enthalpy and time dependence
Oppenheim, A. K.↗
Donor abilities of sulfoxides, sulfinamides, and thionylamides.
Enthalpies determination of adduct formation of sulfoxides, sulfanimides and thionylamides with trimethylalane, noting replacement effect on electron donating ability of oxygen
Eyman, D. P.↗
Lightweight, high-thermal-capacity force models for use in arc tunnels.
Refractory cone models made of copper and Co coated Be for force tests in high enthalpy hypersonic arc tunnels at high simulated attitudes
Fowke, J. G.↗
Heat transfer and laminar boundary-layer distributions in an internal subsonic gas stream at temperatures up to 13,900 deg R.
Velocity, enthalpy and mass flux radial distributions in laminar boundary layer from calorimetry of argon subsonic flow
Back, L. H.↗
Complex defects in CoO.
CoO complex defects indicated by negative enthalpy of formation, considering isobaric electrical conductivity measurements at various temperatures and oxygen pressures
Hed, A. Z.↗
Some numerical results on viscous low-density nozzle flows in the slender-channel approximation.
Viscous convergent-divergent nozzle flow slender channel approximations, discussing roles of nozzle geometry, Reynolds number and wall temperature, calculating velocity, enthalpy, etc
Rae, W. J.↗
Stagnation-point heat transfer in arc-heated helium and argon.
He and Ar arc-heated flows into reservoir and expansion in converging-diverging supersonic nozzles, considering flow equilibrium effect on heat transfer and enthalpy
Pope, R. B.↗
The computation of partition functions and thermochemistry data for atomic, ionic, diatomic, and polyatomic species
Computation of specific free energy and enthalpy for atomic, diatomic, and polyatomic species from partition functions
Horton, T. E.↗
Determination of the well depth for weak intermolecular potentials
Well depth determination for weak intermolecular potentials based on dimerization enthalpy measurement of rare gas atoms by mass spectrometry
Mason, E. A.↗
Stagnation-point heat-transfer rate in nitrogen plasma flows - Theory and experiment
Heat transfer rates to stagnation point of hemisphere in supersonic high enthalpy low density nitrogen plasma flow
Okuno, A. F.↗
Thermodynamics of vaporization of GeF2, SnF2 and PbF2 and bond dissociation energies of group IVA fluorides
Group 4A difluorides vaporization thermodynamics and bond dissociation energies, tabulating mass spectra, vapor composition, reaction enthalpies, heats of polymerization and thermodynamic functions
Hastie, J. W.↗
Acceleration and cooling effects in laminar boundary layers - Subsonic, transonic, and supersonic speeds
Subsonic, transonic and supersonic laminar boundary layers acceleration and cooling effects, discussing heat transfer and gas enthalpy
Back, L. H.↗
Flow in a cylindrical shock tube with radiative energy loss
Multiband radiative cooling effect on enthalpy distribution behind incident wave in cylindrical shock tube for air, using differential approximation
Chien, K.-Y.↗