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  • FLUID MECHANICS AND HEAT TRANSFER  (6)
  • Launch Vehicles and Launch Operations
  • 2005-2009
  • 1990-1994  (6)
  • 1991  (6)
  • 1
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    The linear stability of plane stagnation-point flow against general disturbances (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The linear-stability theory of plane stagnation-point flow against an infinite flat plate is re-examined. Disturbances are generalized from those of Goertler type to include other types of variations along the plate. It is shown that Hiemenz flow is linearly stable and that the Goertler-type modes are those that decay slowest. This work then rationalizes the use of such self-similar disturbances on Hiemenz flow and shows how questions of disturbance structure can be approached on other self-similar flows.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Quarterly Journal of Mechanics and Applied Mathematics (ISSN 0033-5614); 44; 135-146
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Atmospheric pressure flow reactor: Gas phase chemical kinetics under tropospheric conditions without wall effects (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A flow reactor for simulating the interaction in the troposphere is set forth. A first reactant mixed with a carrier gas is delivered from a pump and flows through a duct having louvers therein. The louvers straighten out the flow, reduce turbulence and provide laminar flow discharge from the duct. A second reactant delivered from a source through a pump is input into the flowing stream, the second reactant being diffused through a plurality of small diffusion tubes to avoid disturbing the laminar flow. The commingled first and second reactants in the carrier gas are then directed along an elongated duct where the walls are spaced away from the flow of reactants to avoid wall interference, disturbance or turbulence arising from the walls. A probe connected with a measuring device can be inserted through various sampling ports in the second duct to complete measurements of the first and second reactants and the product of their reaction at selected XYZ locations relative to the flowing system.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Format: application/pdf
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  • 3
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    A new parameter for predicting crossflow instability (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Instability of boundary-layer over a concave wall and a rotating disk which were thought to be essentially different in instability sources, are compared in order to investigate whether or not a single crossflow parameter can be defined. Using a newly defined crossflow parameter, prediction was attempted on a yawed cylinder boundary-layer transition. By comparing the calculation with experiment, it was found out that this parameter can document fairly well the onset condition of the crossflow instability.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: ASME and JSME Joint Fluids Engineering Conference; Jun 23, 1991 - Jun 27, 1991; Portland, OR; United States
    Format: text
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  • 4
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    Time-accurate finite difference solutions to the incompressible Navier-Stokes/energy equations (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Two new algorithms for solving coupled Navier-Stokes and energy equations are presented. The algorithms are compared with available Navier-Stokes solutions for the model problem of a driven-cavity-flow over a range of Reynolds numbers. It is noted that the algorithms represent two different implementations of the fractional step approach to the solution of the coupled Navier-Stokes and energy equations using the Boussinesq approximation.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA Computational Fluid Dynamics Conference; Jun 24, 1991 - Jun 27, 1991; Honolulu, HI; United States
    Format: text
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  • 5
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    Sensible heat receiver for solar dynamic space power system (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A sensible heat receiver is considered which uses a vapor grown carbon fiber-carbon (VGCF/C) composite as the thermal storage medium and which was designed for a 7-kW Brayton engine. This heat receiver stores the required energy to power the system during eclipse in the VGCF/C composite. The heat receiver thermal analysis was conducted through the Systems Improved Numerical Differencing Analyzer and Fluid Integrator (SINDA) software package. The sensible heat receiver compares well with other latent and advanced sensible heat receivers analyzed in other studies, while avoiding the problems associated with latent heat storage salts and liquid metal heat pipes. The concept also satisfies the design requirements for a 7-kW Brayton engine system. The weight and size of the system can be optimized by changes in geometry and technology advances for this new material.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: IECEC ''91: Intersociety Energy Conversion Engineering Conference; Aug 04, 1991 - Aug 09, 1991; Boston, MA; United States
    Format: text
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  • 6
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    The rate of collisions due to Brownian or gravitational motion of small drops (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Quantitative predictions of the collision rate of two spherical drops undergoing Brownian diffusion or gravitational sedimentation are presented. The diffusion equation for relative Brownian motion of two drops is derived, and the relative motion of pairs of drops in gravitational sedimentation is traced via a trajectory analysis in order to develop theoretical models to determine the collision efficiencies, both with and without interparticle forces applied between the drops. It is concluded that finite collision rates between nondeforming fluid drops are possible for Brownian diffusion or gravitational sedimentation in the absence of attractive forces, in stark contrast to the prediction that lubrication forces prevent rigid spheres from contacting each other unless an attractive force that becomes infinite as the separation approaches zero is applied. Collision rates are shown to increase as the viscosity of the drop-phase decreases. In general, hydrodynamic interactions reduce the collision rates more for gravitational collisions than for Brownian collisions.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Journal of Fluid Mechanics (ISSN 0022-1120); 230; 479-504
    Format: text
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