![]() Due to the low value of the measurements, just 1% of the mean bed pressure drop, it seems possible that the data is in error. Specifically, the predicted time averaged standard deviation of the pressure drop is found to be over an order of magnitude larger than measured. Unfortunately, the good agreement of the solids-phase is overshadowed by significant disagreement in the gas-phase data. Although it is more difficult to determine the jet penetration depths in a straightforward manner as in the previous works using Froude number contours, the CFD-DEM results compare quite well to the PIV measurements, particularly for submodel flow Syam. ![]() Four model subvariants are considered using two methods of representing the jets and two drag models, both of which are calibrated to exactly match the experimentally measured minimum fluidization velocity. A CFD-DEM model of the bed is presented using the recently released MFIX-Exa code. Particle Image Velocimetry more ยป (PIV) is used to determine particle motion, characterized as a mean Froude number, from the high-speed video. ![]() Two primary measurements are taken: high-speed video recording of the front of the bed and bed pressure drop from a tap in the back of the bed. The bed is operated just at and slightly above and below the minimum fluidization velocity and additional fluidization is provided by two high-speed gas located on the sides of the bed near the flat, front face of the unit. In this work, the particles are (nominally) 1 mm ceramic beads. This work marks the third in a series of experiments that were in a semi-circular, gas-fluidized bed with side jets. In addition, the effect of different drag laws applied within the CFD simulation is examined and compared with experimental = , The comparison reveals good agreement with respect to system component pressure drop and inventory height in the standpipe. This paper reports a detailed and direct comparison between CFD-DEM results and experimental data for realistic gas-solid fluidization in a full-loop circulating fluidized bed system. Comparative numerical simulations are performed with a Computational Fluid Dynamics solver utilizing a Discrete Element Method (CFD-DEM). ![]() The bed height of the quasi-static region in the standpipe is also measured. The solids circulation rate is measured with an advanced Particle Image Velocimetry (PIV) technique. Experimental measurements of pressure drop are taken at different locations along the bed. Both experimental and computational studies of the fluidization of high-density polyethylene (HDPE) particles in a small-scale full-loop circulating fluidized bed are conducted. ![]()
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