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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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Machine-learning-based real-time, high-fidelity neutron source identification via cavitation acoustic shock spectra in centrifugally tensioned metastable fluid detectors
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Influence of Atherosclerotic Risk Factors on the Effectiveness of Therapeutic Ultrasound Cavitation for Flow Augmentation
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Liquid-metal cavitation-erosion research investigation status report, oct. 1, 1961 - apr. 1, 1962
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Cavitation in mechanical face seals.
Gas cavities in mechanical face seals operating with hydrodynamic films, obtaining solutions to Reynolds equation for hydrodynamic lubrication
Cavitation performance of 80.6 deg helical inducer in liquid hydrogen
Net positive suction head requirements for helical inducer in liquid hydrogen under varied flow and temperature conditions
Mod-C program, turbine visco seal cavitation tests
Testing designs of seal-to-space system for SNAP 8 turbine
Role of physical properties of liquids in cavitation erosion
The dependence of erosion rates on the ambient temperature of water is discussed. The assumption that the gas inside the bubble is compressed adiabatically during collapse gives better agreement with experiments than the assumption that the gas is isothermally compressed. Acoustic impedance is an important liquid parameter that governs the erosion intensity in vibratory devices. The investigation reveals that the major physical properties of liquids governing the intensity of erosion include density, sound speed, surface tension, vapor pressure, gas content, and nuclei distribution.
Asperity lubrication and cavitation in face seals
The basic aspect of parallel-surface lubrication that distinguishes it from other areas of lubrication technology is that classical lubrication theory does not predict the existence of a stable hydrodynamic film for steady-state, isothermal, incompressible flow between smooth, parallel surfaces. Hydrodynamic films between apparently parallel surfaces have been observed in practice and are often essential for the reliable performance of thrust bearings and seals. In order to account for this fortunate discrepancy between classical theory and experiment, load-support mechanisms relating to accidential features characteristic of seal performance, which relax one or more of the assumptions in the classical theory and permit the theoretical prediction of load support are proposed. Some of the features that have been analyzed are vibratory effects such as wobble and bounce, surface waviness, nonsymmetric rotation resulting from various types of misalignment, lubricant density change, non-Newtonian lubricant effects, and surface roughness.
An experimental and theoretical investigation of thermodynamic effects on developed cavitation
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High-speed motion picture camera experiments of cavitation in dynamically loaded journal bearings
(Previously announced in STAR as N82-20543)
The initial stages of cavitation damage and erosion on copper and brass tested in a rotating disk device
(Previously announced in STAR as N83-13231)
Dynamics and mechanism of cavitation erosion on perspex and epoxy resin tested in a rotating disk device
(Previously announced in STAR as N83-11329)
A unified relation for cavitation erosion
A power-law relationship between the average erosion rate and cumulative erosion is presented. Data analyses from Venturi, magnetostriction, and liquid-impingement devices conform to this unified relation. A normalization technique is also suggested for prediction purposes.
Effects of Sweepback and Taper on the Force and Cavitation Characteristics of Aspect-ratio-4 Hydrofoils
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An Inducer CFD Solution and Effects Associated with Cavitation
This presentation describes a CFD analysis for an Alternate Turbopump Development (ATD) configuration. The analysis consists of a coupled configuration of the inducer and impeller. The work presented here is a joint collaboration of J. Garrett, J. Kuryla and myself.
MC-1 LOX Pump Rotating Cavitation: Issue and Investigation
Leading edge tip deformation was noted on the LOX inducer from the component test unit at disassembly. The damage was in a location similar to a previous Fastrac water flow inducer failure. A team was formed to investigate the anomaly.
Dynamic Nucleation of Ice Induced by a Single Stable Cavitation Bubble
Dynamic nucleation of ice induced by caviation bubble in undercooled water is observed using an acoustic levitation technique. The observation indicates that a high pressure pulse associated with a collapsing bubble is indeed responsible for the nucleation of a high pressure phase of ice.