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  • Life and Medical Sciences  (479)
  • FLUID MECHANICS AND HEAT TRANSFER
  • 1990-1994
  • 1975-1979  (683)
  • 1915-1919
  • 1979  (683)
Collection
Keywords
Publisher
Years
  • 1990-1994
  • 1975-1979  (683)
  • 1915-1919
Year
  • 1
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    First results of a study on turbulent boundary layers in oscillating flow with a mean adverse pressure gradient (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The development of a turbulent unsteady boundary layer with a mean pressure gradient strong enough to induce separation, in order to complete the extend results obtained for the flat plate configuration is presented. The longitudinal component of the velocity is measured using constant temperature hot wire anemometer. The region where negative velocities exist is investigated with a laser Doppler velocimeter system with BRAGG cells. The boundary layer responds by forced pulsation to the perturbation of potential flow. The unsteady effects observed are very important. The average location of the zero skin friction point moves periodically at the perturbation frequency. Average velocity profiles from different instants in the cycle are compared. The existence of a logarithmic region enables a simple calculation of the maximum phase shift of the velocity in the boundary layer. An attempt of calculation by an integral method of boundary layer development is presented, up to the point where reverse flow starts appearing.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-75799 , Colloq. d''Aerodyn. Appl.; Nov 07, 1978 - Nov 09, 1978; Marseille
    Format: application/pdf
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  • 2
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    Nonlinear Fourier algorithm applied to solving equations of gravitational gas dynamics (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Two dimensional gas flow problems were reduced to an approximating system of common differential equations, which were solved by a standard procedure of the Runge-Kutta type. A theorem of the existence of stationary conical shock waves with the cone vertex in the gravitating center was proved.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-75627 , PR-423
    Format: application/pdf
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  • 3
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    Thermal analysis of turbulent flow of a supercritical fluid (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The influence of the large variation of thermodynamics and transport properties near the pseudocritical temperature on the heat transfer coefficient of supercritical fluid in turbulent flow was studied. The formation of the characteristics peak in the heat transfer coefficient vs. bulk temperature curve is described, and the necessity of the fluid element at pseudocritical temperature located in the buffer layer is discussed.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-75406 , COBEM 75: The 3d Brazilian Congr. on Mech. Eng.; Dec 09, 1975 - Dec 11, 1975; Rio de Janeiro; Brazil
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  • 4
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    Memory effects in turbulence (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: Experimental investigations of the wake flow of a hemisphere and cylinder show that such memory effects can be substantial and have a significant influence on momentum transport. Memory effects are described in terms of suitable memory functions.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-75516
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  • 5
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    Outline of research on oscillating boundary layers (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: The state of the art in the field of unsteady boundary layers is outlined with emphasis on turbulent boundary layers. The unsteady flows considered are mainly periodic with the external velocity varying around a zero or nonzero mean time value. The principal results obtained on laminar boundary layers are also presented.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-75806 , Colloq. on Appl. Aerodyn.; Nov 07, 1978 - Nov 09, 1978; Marseille
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  • 6
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    Fundamentals of heat measurement (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: Various methods and devices for obtaining experimental data on heat flux density over wide ranges of temperature and pressure are examined. Laboratory tests and device fabrication details are supplemented by theoretical analyses of heat-conduction and thermoelectric effects, providing design guidelines and information relevant to further research and development. A theory defining the measure of correspondence between transducer signal and the measured heat flux is established for individual (isolated) heat flux transducers subject to space and time-dependent loading. An analysis of the properties of stacked (series-connected) transducers of various types (sandwich-type, plane, and spiral) is used to derive a similarity theory providing general governing relationships. The transducers examined are used in 36 types of derivative devices involving direct heat loss measurements, heat conduction studies, radiation pyrometry, calorimetry in medicine and industry and nuclear reactor dosimetry.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-75490
    Format: application/pdf
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  • 7
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    Contribution to the study of turbulence spectra (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: An apparatus suitable for turbulence measurement between ranges of 1 to 5000 cps and from 6 to 16,000 cps was developed and is described. Turbulence spectra downstream of the grills were examined with reference to their general characteristics, their LF qualities, and the effects of periodic turbulence. Medium and HF are discussed. Turbulence spectra in the boundary layers are similarly examined, with reference to their fluctuations at right angles to the wall, and to lateral fluctuations. Turbulence spectra in a boundary layer with suction to the wall is discussed. Induced turbulence, and turbulence spectra at high Reynolds numbers. Calculations are presented relating to the effect of filtering on the value of the correlations in time and space.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-75420
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  • 8
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    Application of numerical solutions to non-linear problems of fluid mechanics obtained by the method of least squares and the finite element method to unsteady Navier-Stokes equations (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: A method of calculating viscous fluid flows having an average Reynolds number is presented.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-75727 , Colloq. d''Aerodyn. Appl.; Nov 07, 1978 - Nov 09, 1978; Marseille
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  • 9
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    Application of the principle of similarity fluid mechanics (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: Possible applications of the principle of similarity to fluid mechanics is described and illustrated. In correlating thermophysical properties of fluids, the similarity principle transcends the traditional corresponding states principle. In fluid mechanics the similarity principle is useful in correlating flow processes that can be modeled adequately with one independent variable (i.e., one-dimensional flows). In this paper we explore the concept of transforming the conservation equations by combining similarity principles for thermophysical properties with those for fluid flow. We illustrate the usefulness of the procedure by applying such a transformation to calculate two phase critical mass flow through a nozzle.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: International Conference on the Properties of Steam; Sept. 8-14, 1979; Munich
    Format: text
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  • 10
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    Critical mass flux through short Borda type inlets of various cross sections (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: Mass flux measurements associated with choked flows through four Borda-type inlet geometries: circular, square, triangular, and rectangular (two-dimensional) and two sharp-edged geometries are discussed for a wide range of inlet stagnation conditions. The results obtained indicate that the mass flux is independent of the inlet cross-section geometry, while it is dependent on the inlet stagnation conditions. The results also suggest that parallel surfaces as found in seals, dampers, bearings, and heat exchanger tubes of rectangular cross section with Borda-type inlet configurations are subject to large forces. It is noted that the reduced mass flux is independent of working fluid.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: International Congress of Refrigeration; Sept. 23-29, 1979; Venice; Italy
    Format: text
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