Two Single Radioactive Particle Tracking (RPT) Techniques
The laboratory is equipped with two single radioactive particle tracking techniques with up-to-date, fast, and high precision electronics (up to 500 Hz sampling rate). The RPT technique measures the phase (solids or liquid) dynamic trajectory and from which the three-dimensional (3D) full flow field, velocity, turbulent parameters, residence time distributions, etc. are computed in a non-invasive manner. The instantaneous particle position is identified by monitoring simultaneously the radiation intensities at a set of sodium iodide detectors (16-32) located strategically around the column.
Recently, the resolution of the technique has been improved to be within 1-2mm.In-house developed algorithms are used to estimate the position of the particle at a given sampling instant in time. The method is capable of yielding instantaneous and time-averaged velocities which can then be used to determine various turbulence parameters such as Reynolds stresses, turbulent kinetic energy, turbulent eddy diffusivities, etc.
Recently, a novel hybrid dynamic calibration device has been developed to enhance the accuracy of the calibration which can be done simultaneously with the actual measurements.
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