<i>Fluid Flow</i>

Sabersky, Rolf H.; Acosta, Allen J.; Liebhafsky, H. A.

doi:10.1063/1.3047179

Cited by 24 publications

(34 citation statements)

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“…This is due to the increase in gas velocity obtained with the lower molecular weight gas. Increasing the temperature of the main gas flow also allows higher gas velocities to be achieved for a given pressure (Ref 7,10). This increase in gas velocity outweighs the corresponding decrease in gas density, so the drag on the particles increases.…”

Section: In-flight Particle Velocitiesmentioning

confidence: 99%

Particle Velocity and Deposition Efficiency in the Cold Spray Process

Gilmore

Dykhuizen

Neiser

et al. 1999

Journal of Thermal Spray Technology

411

149

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Copper powder was sprayed by the cold-gas dynamic method. In-flight particle velocities were measured with a laser-two-focus system as a function of process parameters such as gas temperature, gas pressure, and powder feed rate. Particle velocities were uniform in a relatively large volume within the plume and agreed with theoretical predictions. The presence of the substrate was found to have no significant effect on particle velocities. Cold-spray deposition efficiencies were measured on aluminum substrates as a function of particle velocity and incident angle of the plume. Deposition efficiencies of up to 95% were achieved. The critical velocity for deposition was determined to be about 640 meters per second.

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Section: In-flight Particle Velocitiesmentioning

confidence: 99%

Particle Velocity and Deposition Efficiency in the Cold Spray Process

Gilmore

Dykhuizen

Neiser

et al. 1999

Journal of Thermal Spray Technology

411

149

View full text Add to dashboard Cite

show abstract

“…Similarly, the Hagen-Poiseulle law from Navier-Stokes equation for steady laminar fluid flow in a pipe is given by: (2) where is a specific discharge across the pipe, r is a radius of a pipe, is dynamic viscosity of the fluid, p is fluid pressure [Sabersky et al, 1971]. If , then…”

Section: Hydraulic Conductivity Permeability and Relative Permeabilitymentioning

confidence: 99%

The response of two-phase hydrothermal systems to changing magmatic heat input at mid-ocean ridges

Choi

Lowell

2015

Deep Sea Research Part II: Topical Studies in Oceanography

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Hydrothermal processes at oceanic spreading centers are largely influenced by changing magmatic heat input. I use the NaCl-H 2 O FISHES code to investigate the evolution of surface temperature and salinity as a function of time-varying heat flux at the base of a two-phase, vaporbrine hydrothermal system. I consider a two-dimensional rectangular box that is 1.5 km deep and 4 km long with homogeneous permeability of 10 -13 m 2 . Temperature and pressure at top boundary correspond to seafloor conditions of 10C, 25MPa respectively. Impermeable,

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“…Efficiency of the pump is calculated based on the following procedure. The theoretical head coefficient is expressed as 16) …”

Section: Resultsmentioning

confidence: 99%

Conceptual Study of Throttled Operation of Rocket Engine Turbopump

Kanda

2013

Trans. Japan Soc. Aero. S Sci.

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Throttled operation of turbopumps of liquid rocket engines is studied analytically. Two types of pressure drops in the propellant injector are examined, that is, the drop of gas injection and that of liquid injection. Circulation is examined in relation to throttling to operate the pump in the vicinity of the design condition. An enthalpy increase at the pump entrance is derived analytically in the circulation system. With the derived analytical relationships, throttled operating conditions are examined for imaginary LH 2 and LOX turbopumps with a LH 2 /LOX property calculation code. The circulation causes gasification at the entrance of the high-pressure LH 2 pump. This does not occur in the mid-pressure LH 2 pump or the LOX pump. In the liquid propellant injection system, the unstable region becomes narrower than in the gas propellant injection. The ratio of the turbine flow rate to the pump flow rate decreases in line with throttling. Throttling does not degrade the engine specific impulse from the viewpoint of the turbine bleed ratio.

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Fluid Flow

Cited by 24 publications

References 0 publications

Particle Velocity and Deposition Efficiency in the Cold Spray Process

Particle Velocity and Deposition Efficiency in the Cold Spray Process

The response of two-phase hydrothermal systems to changing magmatic heat input at mid-ocean ridges

Conceptual Study of Throttled Operation of Rocket Engine Turbopump

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