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  • Inorganic Chemistry  (658)
  • FLUID MECHANICS AND HEAT TRANSFER  (580)
  • 1985-1989  (1,238)
  • 1987  (1,238)
Collection
Keywords
Publisher
Years
  • 1985-1989  (1,238)
Year
  • 1
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    Characteristic features of the operation of high-temperature heat pipes with a noncondesable gas (1987)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The principal concepts related to the nature of the processes occurring in high-temperature heat pipes with a noncondensable gas are examined, and guidelines for the development of such heat pipes are presented. The discussion is illustrated by experimental results obtained for a horizontal sodium heat pipe (diameter, 18/1 mm; length, 710 mm). In particular, attention is given to the starting dynamics and mechanisms, the shape of the vapor-gas front, and the vapor-gas front velocity.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TT-20015 , NAS 1.77:20015
    Format: text
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  • 2
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    Heat transfer during the boiling of liquids in heat pipe wicks (1987)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Data in the literature on heat transfer in the case of nucleate boiling of various liquids in the wicks of heat pipes are reviewed. It is shown that none of the known analytical relationships can be used to generalize, with sufficient accuracy, the experimental data found in the literature. It is further shown that the exponent of the specific heat flux in the heat transfer law changes as a function of the liquid and wick properties. A relationship is obtained which generalizes experimental data for heat transfer agents of moderate temperatures (water, acetone, ethanol, and R-11 and R-113 coolants) and ammonia.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TT-20108 , NAS 1.77:20108
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  • 3
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    Transitional Boundary Layers Under the Influence of High Free Stream Turbulence, Intensive Wall Cooling and High Pressure Gradients in Hot Gas Circulation (1987)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The requirements for fundamental experimental studies of the influence of free stream turbulence, pressure gradients and wall cooling are discussed. Under turbine-like free stream conditions, comprehensive tests of transitional boundary layers with laminar, reversing and turbulent flow increments were performed to decouple the effects of the parameters and to determine the effects during mutual interaction.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-88524 , NAS 1.15:88524
    Format: application/pdf
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  • 4
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    Experimental studies on the stability and transition of 3-dimensional boundary layers (1987)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: Three-dimensional unstable boundary layers were investigated as to their characteristic instabilities, leading to turbulence. Standing cross-flow instabilities and traveling waves preceding the transition were visualized with the hydrogen bubble technique in the boundary layer above the wall of a swept cylinder. With the sublimation method and hot film technique, a model consisting of a swept flat plate with a pressure-inducing displacement body in the 1 m wind tunnel was studied. Standing waves and traveling waves in a broad frequency are observed. The boundary layer of this model is close to the assumptions of the theory.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-88539 , NAS 1.15:88539 , DFVLR-FB-86-24
    Format: application/pdf
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  • 5
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    Spacelab 3 Mission Science Review (1987)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: Papers and abstracts of the presentations made at the symposium are given as the scientific report for the Spacelab 3 mission. Spacelab 3, the second flight of the National Aeronautics and Space Administration's (NASA) orbital laboratory, signified a new era of research in space. The primary objective of the mission was to conduct applications, science, and technology experiments requiring the low-gravity environment of Earth orbit and stable vehicle attitude over an extended period (e.g., 6 days) with emphasis on materials processing. The mission was launched on April 29, 1985, aboard the Space Shuttle Challenger which landed a week later on May 6. The multidisciplinary payload included 15 investigations in five scientific fields: material science, fluid dynamics, life sciences, astrophysics, and atmospheric science.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-CP-2429 , M-547 , NAS 1.55:2429
    Format: application/pdf
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  • 6
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    What happens to the large eddies when net drag reduction is achieved by outer flow manipulators? (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: The tandem-arranged parallel plate manipulator (TAPPM) presently used to generate a flow with net drag reduction is conditionally sampled and found to exhibit significant changes of the boundary layer's large-scale motions at 20 delta(0), where delta(0) is the boundary layer thickness at the upstream plate of the TAPPM. Flow fields in the 'valleys' are equally affected. Both turbulent and irrotational flows then reestablish themselves by 50 delta(0). Flow visualization indicates that the TAPPM wake is very coherent at 20 delta(0), and has not yet spread into the wall region, while large scale motions and the ambient response flow continue to exhibit dynamic changes. This indicates that the shielding effect of the TAPPM's wake prolongs suppression of large-scale motions, thereby reducing skin friction over a sufficiently long extent of the boundary layer to overcome device drag and yield net drag reductions.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Turbulent drag reduction by passive means; Sept. 15-17, 1987; London
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  • 7
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    Turbulence structure at high shear rate (1987)
    In:  Other Sources
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    Publication Date: 2019-07-27
    Description: The structure of homogeneous turbulence in the presence of a high shear rate is studied using results obtained from three-dimensional time-dependent numerical simulations of the Navier-Stokes equations on a grid of 512 x 128 x 128 node points. It is shown that high shear rate enhances the streamwise fluctuating motion to such an extent that a highly anisotropic turbulence state with a one-dimensional velocity field and two-dimensional small-scale turbulence develops asymptotically as total shear increases. Instantaneous velocity fields show that high shear rate in homogeneous turbulent shear flow produces structures which are similar to the streaks present in the viscous sublayer of turbulent boundary layers.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Symposium on Turbulent Shear Flows; Sept. 7-9, 1987; Toulouse; France
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  • 8
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    Rotordynamic forces on centrifugal pump impellers (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: The asymmetric flow around an impeller in a volute exerts a force upon the impeller. To study the rotordynamic force on an impeller which is vibrating around its machine axis of rotation, the impeller, mounted on a dynamometer, is made to whirl in a circular orbit within the volute. The measured force is expressed as the sum of a steady radial force and an unsteady force due to the eccentric motion of the impeller. These forces were measured in separate tests on a centrifugal pump with radically increased shroud clearance, a two-dimensional impeller, and an impeller with an inducer, the impeller of the HPOTP (High Pressure Oxygen Turbopump) of the SSME (Space Shuttle Main Engine). In each case, a destabilizing force was observed over a region of positive whirl.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Conference on Fluid Machinery; Sept. 1987; Budapest; Hungary
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  • 9
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    Near-wall k-epsilon turbulence modeling (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: The flow fields from a turbulent channel simulation are used to compute the budgets for the turbulent kinetic energy (k) and its dissipation rate (epsilon). Data from boundary layer simulations are used to analyze the dependence of the eddy-viscosity damping-function on the Reynolds number and the distance from the wall. The computed budgets are used to test existing near-wall turbulence models of the k-epsilon type. It was found that the turbulent transport models should be modified in the vicinity of the wall. It was also found that existing models for the different terms in the epsilon-budget are adequate in the region from the wall, but need modification near the wall. The channel flow is computed using a k-epsilon model with an eddy-viscosity damping function from the data and no damping functions in the epsilon-equation. These computations show that the k-profile can be adequately predicted, but to correctly predict the epsilon-profile, damping functions in the epsilon-equation are needed.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Symposium on Turbulent Shear Flows; Sept. 7-9, 1987; Toulouse; France
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  • 10
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    Stochastic estimation of organized structures in turbulent channel flow (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: Linear stochastic estimation is used to approximate the conditional vector fields associated with high Reynolds stress producing events in numerically simulated turbulent channel flow. Joint probability density distributions of u-v are presented for y(+) between 1.35 and 180, and at each position the u-v values that make the greatest contributions to the average uv3 are used to define conditional ejection- and sweep-type events. In the y-z plane the conditional fields appear to be pairs of counter-rotating vortices. When the conditional event defined by the weighted probability density function is specified at a point close to the wall, the spacing and size of these eddies are consistent with the accepted wall streak spacing. As this point moves outwards, the eddy size increases significantly. An abrupt change in the flow angle occurs in the buffer layer and may indicate transition from streamwise oriented wall layer structures to hairpin vortices characterizing the outer layer.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Symposium on Turbulent Shear Flows; Sept. 7-9, 1987; Toulouse; France
    Format: text
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