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  • FLUID MECHANICS AND HEAT TRANSFER  (73)
  • 1995-1999
  • 1985-1989  (73)
  • 1975-1979
  • 1989  (73)
  • 1
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    Primary zone dynamics in a gas turbine combustor (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Fluid mechanical investigations simulating the flow in the primary zone of a gas turbine combustor are presented using three generic test rigs: (1) rotating pipe yielding a swirling jet of air; (2) primary zone model with a single swirler and various primary jet configurations, operated with air; and (3) two rectangular models of a (stretched-out) annular combustor with five swirlers in the backwall and with various primary jet configurations, one operated with air and the other with water. Concentration measurements are obtained using laser sheet imaging techniques and velocity measurements using a laser Doppler velocimeter. The results show recirculation zones, intense mixing, instabilities of the interacting jets and the presence of large random vortical motions. The flowfields are shown to exhibit bimodal behavior, have asymmetries despite symmetrical geometry and inlet conditions and display strong jet/swirler and swirler/swirler interactions.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 89-0489
    Format: text
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  • 2
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    Godunov computational fluid dynamics method for extreme flow velocities and any equation of state (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA Journal (ISSN 0001-1452); 27; 909-917
    Format: text
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  • 3
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    Near-wall, three-dimensional turbulence measurements: A challenge for laser velocimetry (1989)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A new laser velocimeter approach is presented, which has distinct advantages in near-wall, two- and three-dimensional turbulence measurement applications. The approach does require placing a probe into the flow; but in return, there are some important benefits, such as, the direct measurement of the crossflow velocity, w, at a grazing incidence, and the ability to size optical components for the scale of the flow rather than the size of the facility. Promising resuls were obtained with this approach for a two-dimensional turbulent boundary layer.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-102252 , A-89261 , NAS 1.15:102252 , International Congress on Applications of Laser and Electro-Optics; Oct 15, 1989 - Oct 20, 1989; Orlando, FL; United States
    Format: application/pdf
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  • 4
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    Physical analysis and second-order modelling of an unsteady turbulent flow - The oscillating boundary layer on a flat plate (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The turbulent boundary layer under a freestream whose velocity varies sinusoidally in time around a zero mean is computed using two second order turbulence closure models. The time or phase dependent behavior of the Reynolds stresses are analyzed and results are compared to those of a previous SPALART-BALDWIN direct simulation. Comparisons show that the second order modeling is quite satisfactory for almost all phase angles, except in the relaminarization period where the computations lead to a relatively high wall shear stress.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Symposium on Turbulent Shear Flows; Aug 21, 1989 - Aug 23, 1989; Stanford, CA; United States
    Format: text
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  • 5
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    Variable conductance heat pipe technology for precise temperature control of the NASA/DDLT transmitter (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The application of variable conductance heat pipe technology for achieving precise temperature control to + or - 0.1 C for a space-based laser diode transmitter is described. Heat pipe theory of operation and test data are presented along with a discussion of its applicability for NASA's Direct Detection Laser Transceiver (DDLT) program. This design for the DDLT transmitter features a reduction in space radiator size and up to 42 percent reduction in prime power requirements.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Optomechanical Design of Laser Transmitters and Receivers; Jan 16, 1989 - Jan 17, 1989; Los Angeles, CA; United States
    Format: text
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  • 6
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    Critical transport parameters for porous media subjected to counterflow (1989)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: Experimental and theoretical studies have been conducted to determine critical parameters at the onset of nonlinear counterflow in He II below the lambda point of He-4. Critical temperature differences have been measured in porous media for zero net mass flow and for Darcy permeabilities in the order of magnitude range from 10 to the -10th to 10 to the -8th sq cm. The normalized critical temperature gradients, which covered the liquid temperature range of 1.5 K to the lambda temperature, are found to vary with T proportional to the ratio of the superfluid density to the normal fluid density. This liquid temperature dependence appears to be consistent with duct data which are limited at low temperature by a Reynolds number criterion.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Cryogenics (ISSN 0011-2275); 29; 498-502
    Format: text
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  • 7
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    The effects of particle loading on turbulence structure and modelling (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The objective of the present research was to extend the Direct Numerical Simulation (DNS) approach to particle-laden turbulent flows using a simple model of particle/flow interaction. The program addressed the simplest type of flow, homogeneous, isotropic turbulence, and examined interactions between the particles and gas phase turbulence. The specific range of problems examined include those in which the particle is much smaller than the smallest length scales of the turbulence yet heavy enough to slip relative to the flow. The particle mass loading is large enough to have a significant impact on the turbulence, while the volume loading was small enough such that particle-particle interactions could be neglected. Therefore, these simulations are relevant to practical problems involving small, dense particles conveyed by turbulent gas flows at moderate loadings. A sample of the results illustrating modifications of the particle concentration field caused by the turbulence structure is presented and attenuation of turbulence by the particle cloud is also illustrated.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Annual Research Briefs, 1988; p 55-61
    Format: application/pdf
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  • 8
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    Monte Carlo simulation of an expanding gas (1989)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: By application of simple computer graphics techniques, the statistical performance of two Monte Carlo methods used in the simulation of rarefied gas flows are assessed. Specifically, two direct simulation Monte Carlo (DSMC) methods developed by Bird and Nanbu are considered. The graphics techniques are found to be of great benefit in the reduction and interpretation of the large volume of data generated, thus enabling important conclusions to be drawn about the simulation results. Hence, it is discovered that the method of Nanbu suffers from increased statistical fluctuations, thereby prohibiting its use in the solution of practical problems.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Computers in Physics (ISSN 0894-1866); 3; 73-76
    Format: text
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  • 9
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    On the secondary instability in plane Poiseuille flow (1989)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: Numerical experiments were performed to clarify apparent differences between experimental observations and a theoretical prediction of the secondary instability in plane Poiseuille flow. It is shown that subharmonic breakdown is unlikely in natural transition as a result of the initial growth of what we call the 'minus' modes and consequent forcing of Orr-Sommerfeld modes present in the background noise. Subharmonic breakdown was achieved only when these minus modes were continuously suppressed.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Physics of Fluids A (ISSN 0899-8213); 1; 775-777
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  • 10
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    Characteristic-eddy decomposition of turbulence in a channel (1989)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: Lumley's proper orthogonal decomposition technique is applied to the turbulent flow in a channel. Coherent structures are extracted by decomposing the velocity field into characteristic eddies with random coefficients. A generalization of the shot-noise expansion is used to determine the characteristic eddies in homogeneous spatial directions. Three different techniques are used to determine the phases of the Fourier coefficients in the expansion: (1) one based on the bispectrum, (2) a spatial compactness requirement, and (3) a functional continuity argument. Similar results are found from each of these techniques.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Journal of Fluid Mechanics (ISSN 0022-1120); 200; 471-509
    Format: text
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