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  • GEOPHYSICS  (2,542)
  • Fluid Mechanics and Thermodynamics
  • 2005-2009  (710)
  • 1975-1979  (2,238)
  • 1960-1964  (367)
  • 1950-1954  (31)
  • 1935-1939  (3)
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Year
  • 1
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    Unbalanced-flow, fluid-mixing plug with metering capabilities (2009)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A fluid mixer plug has holes formed therethrough such that a remaining portion is closed to fluid flow. The plug's inlet face defines a central circuit region and a ring-shaped region with the ring-shaped region including at least some of the plug's remaining portion so-closed to fluid flow. This remaining portion or closed region at each radius R of the ring shaped region satisfies a radius independent, flow-based relationship. Entry openings are defined in the plug's inlet face in correspondence with the holes. The entry openings define an open flow area at each radius of the ring-shaped region. The open flow area at each such radius satisfies the inverse of the flow-based relationship defining the closed regions of the plug.
    Keywords: Fluid Mechanics and Thermodynamics
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Unitized regenerative fuel cell system (2008)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A Unitized Regenerative Fuel Cell system uses heat pipes to convey waste heat from the fuel cell stack to the reactant storage tanks. The storage tanks act as heat sinks/sources and as passive radiators of the waste heat from the fuel cell stack. During charge up, i.e., the electrolytic process, gases are conveyed to the reactant storage tanks by way of tubes that include dryers. Reactant gases moving through the dryers give up energy to the cold tanks, causing water vapor in with the gases to condense and freeze on the internal surfaces of the dryer. During operation in its fuel cell mode, the heat pipes convey waste heat from the fuel cell stack to the respective reactant storage tanks, thereby heating them such that the reactant gases, as they pass though the respective dryers on their way to the fuel cell stacks retrieve the water previously removed.
    Keywords: Fluid Mechanics and Thermodynamics
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    System for controlling child safety seat environment (2008)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A system is provided to control the environment experienced by a child in a child safety seat. Each of a plurality of thermoelectric elements is individually controllable to be one of heated and cooled relative to an ambient temperature. A first portion of the thermoelectric elements are positioned on the child safety seat such that a child sitting therein is positioned thereover. A ventilator coupled to the child safety seat moves air past a second portion of the thermoelectric elements and filters the air moved therepast. One or more jets coupled to the ventilator receive the filtered air. Each jet is coupled to the child safety seat and can be positioned to direct the heated/cooled filtered air to the vicinity of the head of the child sitting in the child safety seat.
    Keywords: Fluid Mechanics and Thermodynamics
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    NASA TECHNICAL REPORTS
  • 4
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    System and method for determining velocity of electrically conductive fluid (2008)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A flowing electrically-conductive fluid is controlled between an upstream and downstream location thereof to insure that a convection timescale of the flowing fluid is less than a thermal diffusion timescale of the flowing fluid. First and second nodes of a current-carrying circuit are coupled to the fluid at the upstream location. A current pulse is applied to the current-carrying circuit so that the current pulse travels through the flowing fluid to thereby generate a thermal feature therein at the upstream location. The thermal feature is convected to the downstream location where it is monitored to detect a peak associated with the thermal feature so-convected. The velocity of the fluid flow is determined using a time-of-flight analysis.
    Keywords: Fluid Mechanics and Thermodynamics
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    NASA TECHNICAL REPORTS
  • 5
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    Fluid valve with wide temperature range (1976)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A fluid valve suitable for either metering or pressure regulating fluids at various temperatures is provided for a fuel system as may be utilized in an aircraft gas turbine engine. The valve includes a ceramic or carbon pad which cooperates with a window in a valve plate to provide a variable area orifice which remains operational during large and sometimes rapid variations in temperature incurred from the use of different fuels.
    Keywords: Fluid Mechanics and Thermodynamics
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Overview - Electric fields (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The electric fields session is designed to review progress in observation, theory, and modeling of magnetospheric electric fields, and to expose important new results. The present report comments on the state and prospects of electric field research, with particular emphasis on relevance to quantitative modeling of the magnetospheric processes. Attention is given to underlying theories and models. Modeling philosophy is discussed relative to explanatory models and representative models. Modeling of magnetospheric electric fields, while in its infancy, is developing rapidly on many fronts employing a variety of approaches. The general topic of magnetospheric electric fields is becoming of prime importance in understanding space plasmas.
    Keywords: GEOPHYSICS
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Lightning apparent source of environmentally important gases (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Keywords: GEOPHYSICS
    Type: NASA-NEWS-RELEASE-79-131 , P79-10129
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    NASA TECHNICAL REPORTS
  • 8
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    Application of space technology to crustal dynamics and earthquake research (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: In cooperation with other Federal government agencies, and the governments of other countries, NASA is undertaking a program of research in geodynamics. The present program activities and plans for extension of these activities in the time period 1979-1985 are described. The program includes operation of observatories for laser ranging to the Moon and to artificial satellites, and radio observatories for very long baseline microwave interferometry (VLBI). These observatories are used to measure polar motion, earth rotation, and tectonic plate movement, and serve as base stations for mobile facilities. The mobile laser ranging and VLBI facilities are used to measure crustal deformation in tectonically active areas.
    Keywords: GEOPHYSICS
    Type: NASA-TP-1464
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Lightning as an indication of storm severity (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: There is a substantial case for the theory that cloud electrification is related primarily to strong convection and the sizeable relative air motion that it implies; therefore, the electrification and subsequent discharge rates can be related to the air motion environment of thunderstorms. The isoceraunic contour map used by the WMO for observing and measuring thunderstorm occurrence contains no information on flash rates, flash density, flash relationship to storm severity, or flash variation with meteorological environment. A constant-view geosynchronous lightning mapper would permit simultaneous studies of the lightning discharge patterns and the meteorological environment of storms, thus establishing whether or not there is a reliable enough relationship to use the observed flash rates and characteristics as supplemental guidance for storm forecast refinement.
    Keywords: GEOPHYSICS
    Type: NASA. Marshall Space Flight Center Proc.: Workshop on the Need for Lightning Observations from Space; p 153-155
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    The effect of errors in the assignment of the transmission functions on the accuracy of the thermal sounding of the atmosphere (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: In order to test the error of calculation in assumed values of the transmission function for Soviet and American radiometers sounding the atmosphere thermally from orbiting satellites, the assumptions of the transmission calculation is varied with respect to atmospheric CO2 content, transmission frequency, and atmospheric absorption. The error arising from variations of the assumptions from the standard basic model is calculated.
    Keywords: GEOPHYSICS
    Type: NASA-TM-75654 , Conf. of the Soviet-Am. Working Group on Space Meteorol.; Nov 10, 1976 - Nov 22, 1976; Moscow
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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