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  • Life and Medical Sciences  (7,332)
  • FLUID MECHANICS AND HEAT TRANSFER
  • 1995-1999  (4,160)
  • 1980-1984  (4,906)
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Year
  • 1
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    The coefficient of restitution of ice particles in glancing collisions: Experimental results for unfrosted surfaces (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Both Saturn's rings and planetesimal disks are made up of particles in Keplerian orbits. Inelastic collisions between these particles regulate their dynamical evolution and possible aggregation. We present an experiment to simulate glancing collisions in Saturn's rings and in planetesimal disks and thus measure contributions to the energy loss for both normal and tangential velocity components. In this experiment, a spherical iceball mounted on a long-period, two dimensional pendulum is made to impact a flat ice surface in a low-temperature environment. This paper describes the experimental apparatus in detail and presents results for smooth unfrosted surfaces. The energy loss for tangential motion is suprisingly low, indicating that very little friction is present at low impact speeds for relatively smooth ice surfaces and temperatures near 100 K. We have also investigated room-temperature collisions of a rubber ball on a rough surface to understand the energy loss in situations where the tangential friction force is not small. In this analogous case, the energy loss is maximum for impact angles in the range 45 deg-60 deg.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Icarus (ISSN 0019-1035); 113; 1; p. 188-199
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Implementation of a 3D mixing layer code on parallel computers (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: This paper summarizes our progress and experience in the development of a Computational-Fluid-Dynamics code on parallel computers to simulate three-dimensional spatially-developing mixing layers. In this initial study, the three-dimensional time-dependent Euler equations are solved using a finite-volume explicit time-marching algorithm. The code was first programmed in Fortran 77 for sequential computers. The code was then converted for use on parallel computers using the conventional message-passing technique, while we have not been able to compile the code with the present version of HPF compilers.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 95-6111 , ; 9 p.|AIAA, Aerospace Planes and Hypersonics Technologies Conference; Apr 03, 1995 - Apr 07, 1995; Chattanooga, TN; United States
    Format: text
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  • 3
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    Determination of the transition point in a boundary layer by the measurement of pressure fluctuation (1981)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A method is developed for determining the laminar-to-turbulent transition point in a boundary layer. The method involves the measurement of pressure on the surface of the body and the computation of pressure fluctuations. This method of determining the transition point is suitable when visualization methods cannot be used.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-76639
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  • 4
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    On the electrical heating of wires in rarefied gases by an electric current (1981)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Experimental work to determine the temperature dependence of the heat loss of thin wires in hydrogen is described. An explanation for the peculiar form of the current voltage curve is provided.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-76597
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  • 5
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    The influence of a local wall deformation on the development of natural instabilities in a laminar boundary layer (1981)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The natural instabilities which propagate in the laminar boundary layer of a flat plate composed of intermittent wave trains are described. A spectral analysis determines the frequency range and gives a frequency and the harmonic 2 only if there is a wall deformation. This analysis provides the amplitude modulation spectrum of the instabilities. Plots of the evolution of power spectral density are compared with the numerical results obtained from the resolve of the Orr-Sommerfeld equation, while the harmonic is related to a micro-recirculating flow near the wall deformation.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-76558
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  • 6
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    The hydrodynamic role of fish squamosal integument as an analog of surfaces directly formed by turbulent flow. Report 1: Similarity between irregularities in squamosal integument and those on surfaces formed by river bed flow (1980)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The distribution of squamae on the fish body and that of the deposits in the bed of the river can be described by the same equation. The curves reflecting the relative elongation and stability of the body shape of the fish continue the curves showing the elongation of bank spit and stability of the bed of the river.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-75390
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  • 7
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    Experimental investigation of turbulent flow in smooth and longitudinal grooved tubes (1984)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Turbulent flow in tubes with and without longitudinal grooves is examined. The discovery of fine grooves forming a sort of streamline pattern on the body of sharks led to the expectation that the grooves on a surface reduce the momentum change, and thus the drag. To test this thesis, drag law, velocity profile and the profile of the velocity fluctuation were determined. Results show that for moderate Reynolds numbers the drag coefficient for grooved tubes is about 3 percent smaller than that of the smooth tubes. At higher Reynolds numbers, however, the drag coefficient for grooved tubes becomes larger than that for smooth tubes. No significant differences in the velocity profiles between grooved tubes and smooth tubes are found.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-77480 , NAS 1.15:77480
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  • 8
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    Existence of a natural instability not predicted by theory and connected to a wall deformation in a laminar boundary layer (1981)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Natural instability related to negative wall deformation was studied. It was shown that natural instabilities which propagate in a laminar boundary layer of a flat plate are in agreement with stability theory. It is found that if a wall has a deformation, a second frequency does exist, which is not predicted and is twice the first frequency. This second instable frequency only appears if there is a negative velocity gradient. The phenomenon is located very closely to the wall and drops off rapidly when moved away from it.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-76559
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  • 9
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    An experimental investigation on the subcritical instability in plane Poieseuille flow (1981)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The relationship between the three dimensional properties of the fundamental flow of a plane Poieseuille flow and subcritical stability was studied. An S-T wave was introduced into the flow and the three dimensional development of the wave observed. Results indicate that: (1) the T-S wave has three dimensional properties which are synchronous with the fundamental flow, but there is damping at microamplitude; (2) when the amplitude reaches a certain threshold, subcritical instability and peak valley bifurcation occur simultaneously and a peak valley structure is formed; (3) this threshold depends to a great extent on the frequency; and (4) after the peak valley bifurcation there is a transition to a turbulent flow by the process of laminar flow collapse identical to that in Blasius flow.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-75885
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  • 10
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    Turbulent boundary layers with secondary flow (1984)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: An experimental analysis of the boundary layer on a plane wall, along which the flow occurs, whose potential flow lines are curved in plane parallel to the wall is discussed. According to the equation frequently applied to boundary layers in a plane flow, which is usually obtained by using the pulse law, a generalization is derived which is valid for boundary layers with spatial flow. The wall shear stresses were calculated with this equation.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-77494 , NAS 1.15:77494
    Format: application/pdf
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