Browsing by Author "Hooper, JD"

Now showing 1 - 5 of 5
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    The calculation of fully developed turbulent and laminar single phase flow in four-rod subchannels
    (Australian Atomic Energy Commission, 1975-09) Hooper, JD
    A numerical model of a turbulent single-phase coolant flowing in line through a reactor-type fuel bundle is described for the prediction of the turbulent heat transport characteristics of the fluid and the fuel element pressure drop. A modified two-dimensional form of the Buleev mixing length theory is used to solve the momentum equation for the subchannel average velocity distribution, and for the distribution of the radial and tangential eddy momentum diffusivity. The effect of the anisotropy of the eddy momentum diffusivity in the wall region- on the wall shear stress distribution is examined.
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    Data bank of developed single-phase flow through a square-pitch rod cluster for four Reynolds numbers
    (Australian Atomic Energy Commission, 1983-03) Hooper, JD; Wood, DH; Crawford, WJ
    Complete tabulated data of the mean velocity profiles wall shear stress distribution and all components of the Reynolds stresses are presented for developed single-phase flow through a square-pitch rod array (p/d = 1.107) at Reynolds numbers of 22.6 x 10 346.3 x 103 and 207.6 x 103.
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    Developed single-phase turbulent flow through a square-pitch rod cluster for an extended range of reynolds numbers.
    (Australian Atomic Energy Commission, 1983-06) Hooper, JD; Wood, DH; Crawford, WJ
    The mean velocity profiles wall shear stress distribution and all components of the Reynolds stress tensor have been determined from measurements for developed single-phase flow through a square-pitch rod cluster. For a rod pitch-to-diameter ratio of 1.107 four Reynolds numbers in the range 22.6 x 103 to 207.6 x 103 were investigated. The experimental technique which involved a rotatable inclined hot-wire anemometer probe allowed the measurement of secondary flow components of the order of 1 per cent of the local velocity. No evidence was found for secondary flows in the open rod gap area. The highly anisotropic nature of the turbulence particularly for the interconnecting rod gap region was shown by the level of the azimuthal turbulent shear stress. The mean velocity profiles were generally consistent with the logarithmic region of the universal velocity profile using the Patel values for the profile constants. The wall shear stress distribution measured by Preston tubes was shown to be symmetrical around the central rods of the array.
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    Flow recovery from a plate blockage element in a square-pitch rod array: data bank of the mean and turbulent flow structure.
    (Australian Atomic Energy Commission, 1984-02) Hooper, JD
    A data bank of the mean and turbulent flow structure downstream from an impervious plate blockage in a square-pitch rod array spaced at a p/d ratio of 1.107 is described. The test section represented two interior interconnected subchannels and the plate blockage element fully blocked one subchannel. Measurements were made of the wall shear stress mean axial velocity distribution turbulence intensity Reynolds shear stress and turbulent kinetic energy at distances of 49.7 51.0 65.1 89.3 and 90.6 hydraulic diameters downstream of the blockage at an asymptotic unperturbed Reynolds number of 4.8 x 10 4.
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    Hot-wire anemometry techniques for an automated turbulence measurement rig.
    (Australian Atomic Energy Commission, 1982-03) Hooper, JD; Harris, RW
    An automated rig has been constructed to allow continuous monitoring of the probe steady-state calibration during the measurement of the Reynolds stress tensor in turbulent single-phase flow using a two-channel hot-wire anemometer. The system consists of a signal switching and signal gain control unit, remote probe positioning along three coordinates, and a PDP11/10 computer for on-line data analysis. The system was calibrated using fully developed single-phase turbulent pipe flow; the results showed good agreement with published data. The calibrated system had been used to map the Reynolds stress field in three-dimensional duct flows having a similar turbulence level to developed pipe flow.