Browsing by Author "Price, J"

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    A method for measuring the fluid flow distribution at exit from a right cylindrical, randomly packed bed
    (Australian Atomic Energy Commission, 1966-10) Price, J; Stevens, JR
    A method for measuring the fluid flow distribution at exit from a right cylindrical, randomly packed bed of spheres has been investigated using a flow separator to prevent redistribution of the flow between the exit face of the bed and the plane of measurement. Three designs of separator were tested, for each of which steady fluid velocities were measured with a pitot static tube in the exit plane of the separator, and unsteady velocities with a hot wire anemometer. A separator with contracting flow passages was developed which facilitated measurement and reduced turbulence intensities without causing any significant flow redistribution within the bed. Measurements are presented for a loosely packed bed of glass spheres which show that the velocity profile is reasonably uniform over the bed except for a region within a half sphere diameter of the vessel wall. This differs substantially from the profiles measured by most previous investigators.
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    Review of burnout studies in Freon and description of a Freon loop
    (Australian Atomic Energy Commission, 1968-02) Price, J
    The need for simulation in studies of burnout or critical heat flux for application to nuclear reactor design is outlined. The available literature on the suitability of Freon as a model fluid for water is reviewed and discussed. A brief description is given of a Freon loop currently under construction at the A.A.E.C. Research Establishment.
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    Review of fluid flow distribution through randomly packed beds
    (Australian Atomic Energy Commission, 1966-01) Price, J
    The literature on fluid flow distribution through randomly packed beds is reviewed in relation to a feasibility study of a pebble bed reactor. The methods of measurement used are briefly discussed and existing theoretical solutions are appraised. The experimental data of different observers are in poor agreement. Existing theoretical derivations are found to be inadequate for general application. An alternative theory is proposed which relies upon experiment to specify a boundary condition. The existing superficial velocity profiles can be reasonably predicted in terms of the centre line velocity provided this boundary condition is allowed to vary.
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    Velocity distribution and pressure losses through randomly packed beds of spheres
    (Australian Atomic Energy Commission., 1967-06) Price, J
    Measurements were made of fluid velocity distributions for a number of randomly packed beds of spheres using a flow separator between the exit face of the bed and the plane of measurement. The results for right cylindrical beds show that the departures from uniformity were small, except for a region within one half sphere diameter from the walls of the containing vessel where a marked increase in velocity occurred. The distribution was found to be independent of Reynolds number (1470 < NR < 4350) and bed length (9< L/d < 36). It was only slightly affected by the method of loading the bed, the density and tolerance of the spheres, and sphere diameter (12 < D/d < 48). A marked change was found for a bed which was peaked at exit. Measurements of the pressure losses across the beds were also made. The resulting friction factors for the right cylindrical beds were correlated using the general pressure loss correlation in its normal form and also in a modified form which took the measured velocity distributions into consideration. Both catered adequately for different packing methods and sphere diameter, but not for different bed lengths. Results are presented for the additional pressure losses caused by a peak at exit.