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  • FLUID MECHANICS AND HEAT TRANSFER
  • GENERAL
  • 1975-1979  (24)
  • 1955-1959
  • 1979  (24)
  • 1
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    Investigations on transparent liquid-miscibility gap systems (1979)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Sedimentation and phase separation is a well known occurrence in monotectic or miscibility gap alloys. Previous investigations indicate that it may be possible to prepare such alloys in a low-gravity space environment but recent experiments indicate that there may be nongravity dependent phase separation processes which can hinder the formation of such alloys. Such phase separation processes are studied using transparent liquid systems and holography. By reconstructing holograms into a commercial-particle-analysis system, real time computer analysis can be performed on emulsions with diameters in the range of 5 micrometers or greater. Thus dynamic effects associated with particle migration and coalescence can be studied. Characterization studies on two selected immiscible systems including an accurate determination of phase diagrams, surface and interfacial tension measurements, surface excess and wetting behavior near critical solution temperatures completed.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Alabama Univ. UAH(NASA Workshop on Fluids Expt. System; p 21-35
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  • 2
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    Flow friction of the turbulent coolant flow in cryogenic porous cables (1979)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Considered are cryogenic power transmission cables with porous cores. Calculations of the turbulent coolant flow with injection or suction through the porous wall are presented within the framework of a two-layer model. Universal velocity profiles were obtained for the viscous sublayer and flow core. Integrating the velocity profile, the law of flow friction in the pipe with injection has been derived for the case when there is a tangential injection velocity component. The effect of tangential velocity on the relative law of flow friction is analyzed. The applicability of the Prandtl model to the problem under study is discussed. It is shown that the error due to the acceptance of the model increases with the injection parameter and at lower Reynolds numbers; under these circumstances, the influence of convective terms in the turbulent energy equation on the mechanism of turbulent transport should be taken into account.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-79052 , DOE/NASA/0207-79/1 , Intern. Congr. on Refrigeration; Sep 23, 1979 - Sep 29, 1979; Venice; Italy
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  • 3
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    Solitary waves in stratified shear flows (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: An analysis is described of long, finite-amplitude internal waves in a stratified shear flow. Both regular and singular modes are considered with a nonlinear critical layer employed in the latter case. A three-layer model is used to develop the theory and closed-form expressions are obtained relating the phase speed to the Richardson number, the latter quantity being taken as O(1). The amplitude evolution equation is found to be either the Korteweg-de Vries equation or the Benjamin-Davis-Ono equation depending upon the distance of the more remote boundary from the edge of the shear layer.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Geophysical and Astrophysical Fluid Dynamics; 13; 1-3,; 1979
    Format: text
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  • 4
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    Velocity field near the jet orifice of a round jet in a crossflow (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Experimentally determined velocities at selected locations near the jet orifice are presented and analyzed for a round jet in crossflow. Jet-to-crossflow velocity ratios of four and eight were studied experimentally for a round subsonic jet of air exhausting perpendicularly through a flat plate into a subsonic crosswind of the same temperature. Velocity measurements were made in cross sections to the jet plume located from one to four jet diameters from the orifice. Jet centerline and vortex properties are presented and utilized to extend the results of a previous study into the region close to the jet orifice.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-CR-152293
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  • 5
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    Experimental investigation of flow and heating in a resonance tube (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Experiments have been performed to determine the basic mechanism of heating in resonance tubes of square section with constant area excited by underexpanded jet flows. The jet flow between the nozzle exit and the tube inlet plays a key role in the performance of a resonance tube. A detailed and systematic investigation of the unsteady complex shock structure in this part of the flow region has led to a better understanding of the fundamental mechanisms associated with the gas heating in such tubes. A study of the effects of tube location in relation to free-jet shock location (without the presence of the resonance tube) has shed further light on the underlying mechanism of sustained oscillations of the flow in a resonance tube.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Journal of Fluid Mechanics; 94; Oct. 29
    Format: text
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  • 6
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    Fiscal year 1979 scientific and technical reports, articles, papers and presentations (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: This bibliography lists approximately 590 formal NASA technical reports, papers published in technical journals, presentations by MSFC personnel, and reports of MSFC contractors introduced into the NASA scientific and technical information system in 1979.
    Keywords: GENERAL
    Type: NASA-TM-78250
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  • 7
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    GIM code user's manual for the STAR-100 computer (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The General Interpolants Method (GIM), a three dimensional, time dependent, hybrid procedure for generating numerical analogs of the conversion laws, is described. The Navier-Stokes equations written for an Eulerian system are considered. The conversion of the GIM code to the STAR-100 computer, and the implementation of 'GIM-ON-STAR' is discussed.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-CR-3157 , LMSC-HREC-0568850
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  • 8
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    Marangoni bubble motion in zero gravity (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: It is shown experimentally that the Marangoni phenomenon is a primary mechanism for the movement of a gas bubble in a nonisothermal liquid in a low-gravity environment. In such two-phase flow systems, local variations in bubble surface tension are caused by a temperature gradient in the liquid. Shearing stresses thus generated at the bubble surface lead to convection in both media, as a result of which the bubble begins to move. A mathematical model consisting of the Navier-Stokes equations and the thermal energy equations, along with the appropriate boundary conditions for both media, is proposed.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Annual Meeting; Nov 25, 1979 - Nov 29, 1979; San Francisco, CA
    Format: text
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  • 9
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    Measurements of flow phenomena induced by suction through perforated and partially plugged surfaces (1979)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Efforts were directed towards completing construction of the windtunnel test section, assembling instrumentation, programming the data acquisition and reduction system, adjusting the streamwise pressure gradient of the test section, calibrating the hot-wire anemometer probe, and constructing and testing a smoke generator. The test section was installed in the wind tunnel and is completely operational. The streamwise pressure gradient was adjusted to be nominally zero at a free-stream velocity of 3.05 m/s (10 ft/s). This was accomplished by adjusting the upper wall of the test section to be slightly divergent. The change in static pressure between any two streamwise locations in the test section was less than one percent of the free-stream dynamic pressure. A suitable means was found for accurately calibrating the hot-wire probe which is used to measure boundary-layer velocity profiles and fluctuating velocities.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-CR-158001
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  • 10
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    Application of a velocity-split Navier-Stokes solution technique to external flow problems (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A method for solving the Navier-Stokes equations based on splitting the velocity vector into its rotational and irrotational parts has recently been applied successfully to internal flow computations. In this paper, the applicability of the method to external flows is examined by studying two model problems; laminar incompressible flow over semiinfinite and finite flat plates. For these problems the procedure accurately reproduces the known solutions and is computationally very efficient even at high Reynolds numbers. Computational aspects of the method are discussed along with the possibility of using the procedure to retrofit a viscous capability into existing transonic potential flow codes.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 79-1449 , In: Computational Fluid Dynamics Conference; Jul 23, 1979 - Jul 25, 1979; Williamsburg, VA
    Format: text
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