Oxygen requirements and circulation
Arterial pressure gradients and oxygen requirement in blood circulation and respiratory control
Shik, L. L.↗
SEARCH · Engineering Papers
Results for “pressure gradient”
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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A solution of the inviscid-viscid equations with applications to bounded and unbounded multicomponent reacting flows.
Viscid-inviscid equations solution, describing flows with coupled mixing, combustion and lateral pressure gradients
Edelman, R. B.↗
The warming of the upper stratosphere in February 1966 and the associated structure of the mesosphere.
Upper stratosphere warming and associated structure of mesosphere from rocket sounding, discussing high winds related to pressure gradient, upward vertical motion, etc
Quiroz, R. S.↗
Unsteady MHD flow in arbitrary ducts by point-matching method.
Unsteady MHD conducting fluid flow in arbitrary ducts under transverse magnetic field, studying effects of pressure gradient impulsive change
Jeng, D. R.↗
Use of nonwettable membranes for water transfer
Transfer of water through nonwettable vinyl fluoride membranes has two unique features - /1/ very low water transfer rates can be held constant by holding temperature and solute concentrations constant, /2/ the pressure gradient against which water is transported is limited only by solution breakthrough or membrane strength.
Hausch, H. G.↗
Compressible Turbulent Boundary Layers
Compressibility of turbulent boundary layers - skin friction, heat transfer, flow velocity, temperature distribution, pressure gradients, and aerodynamic drag prediction methods
Source record↗
Power-law velocity-profile-exponent variations with Reynolds number, wall cooling, and Mach number in a turbulent boundary layer
Turbulent boundary layer velocity profiles with favorable pressure gradients
Bushnell, D. M.↗
Nonsimilar nature of the laminar boundary layer
Nonsimilar laminar boundary layer solutions with negative pressure gradient compared to experimental boundary layer velocity profiles, momentum and displacement thicknesses
Gallo, W. F.↗
A three-fluid model of solar winds
Solar wind model with electrons, protons and alpha particles coupled by electric field and expanding due to pressure gradient and solar gravitation
Yeh, T.↗
Crossflow effects on compressible turbulent boundary layer over bodies of revolution
Compressible turbulent boundary layer with adverse pressure gradients and crossflow over revolving bodies, integrating numerically three dimensional compressible integral equations
Calarese, W.↗
Preliminary experimental results from a one- wavelength MHD induction generator
One wavelength MHD induction generator, discussing field pressure gradients, fluid velocities, excitation and electrical output power
Pierson, E. S.↗
Study aids accuracy of turbopump axial thrust analysis
Test program to verify theory used in calculating axial thrust uses turbopump instrumented with /a/ proximity transducers for measuring shaft position, /b/ a strain gage thrust bearing carrier to measure axial thrust, and /c/ internal pressure taps to define component pressure gradients used in thrust calculations.
Nielson, C. E.↗
Near-field characteristics of a high subsonic jet
High subsonic jet near-field acoustic energy flux distribution calculation from pressure gradient measurements
Maestrello, L.↗
Laminar or turbulent boundary-layer flows of perfect gases or reacting gas mixtures in chemical equilibrium
Turbulent boundary layer flows of non-reacting gases are predicted for both interal (nozzle) and external flows. Effects of favorable pressure gradients on two eddy viscosity models were studied in rocket and hypervelocity wind tunnel flows. Nozzle flows of equilibrium air with stagnation temperatures up to 10,000 K were computed. Predictions of equilibrium nitrogen flows through hypervelocity nozzles were compared with experimental data. A slender spherically blunted cone was studied at 70,000 ft altitude and 19,000 ft/sec. in the earth's atmosphere. Comparisons with available experimental data showed good agreement. A computer program was developed and fully documented during this investigation for use by interested individuals.
Anderson, E. C.↗
The pressure and deformation profile between two colliding lubricated cylinders
The pressure and deformation profiles between two colliding lubricated cylinders are obtained by solving the coupled, time-dependent elastohydrodynamic equations with an iterative procedure. The analysis includes effects which were not considered in a previous solution, namely, the effect of the lubricant compressibility and the effect of a lubricant with composite pressure-viscosity coefficients. It is found that the local approach velocity plays an important role during final stages of normal approach. It causes the lubricant to be entrapped within the contact region; neither the pressure nor the deformation profile converges to the Hertzian profile for a dry contact. The use of a smaller pressure-viscosity coefficient at high pressures reduces the sharp pressure gradient at the center of the contact and produces a much milder variation of load with respect to the film thickness. The effect of compressibility of the lubricant is found to be relatively small.
Lee, K.↗
Two phase flow and heat transfer in porous beds under variable body forces, part 2
Analytical and experimental investigations of a pilot model of a channel for the study of two-phase flow under low or zero gravity are presented. The formulation of dimensionless parameters to indicate the relative magnitude of the effects of capillarity, gravity, pressure gradient, viscosity, and inertia is described. The investigation is based on the principal equations of fluid mechanics and thermodynamics. Techniques were investigated by using a laser velocimeter for measuring point velocities of the fluid within the porous material without disturbing the flow.
Evers, J. L.↗
Investigation of rotor blade tip-vortex aerodynamics
Several aspects of the aerodynamics of rotor blade tip vortices are examined. Two particular categories are dealt with; (1) dynamic loads on a blade passing close to or intersecting a trailing vortex, and (2) the response of the trailing vortex core to changes in the flow. Results for both categories are in reasonable agreement with existing data, although lower pressure gradients were obtained than anticipated for category one. A correlation between trailing edge sweep angle at the tip and vortex core size was noted for category two.
Lewellen, W. S.↗
A computer program for the calculation of laminar and turbulent boundary layer flows
The results are presented of a study to produce a computer program to calculate laminar and turbulent boundary layer flows. The program is capable of calculating the following types of flow: (1) incompressible or compressible, (2) two dimensional or axisymmetric, and (3) flows with significant transverse curvature. Also, the program can handle a large variety of boundary conditions, such as blowing or suction, arbitrary temperature distributions and arbitrary wall heat fluxes. The program has been specialized to the calculation of equilibrium air flows and all of the thermodynamic and transport properties used are for air. For the turbulent transport properties, the eddy viscosity approach has been used. Although the eddy viscosity models are semi-empirical, the model employed in the program has corrections for pressure gradients, suction and blowing and compressibility. The basic method of approach is to put the equations of motion into a finite difference form and then solve them by use of a digital computer. The program is written in FORTRAN 4 and requires small amounts of computer time on most scientific machines. For example, most laminar flows can be calculated in less than one minute of machine time, while turbulent flows usually require three or four minutes.
Dwyer, H. A.↗