Measurement of jet angles in fluidized beds

A Model of Attrition in the Jetting Region of Fluidised Beds

“…There is, however, a certain overlap in the gas velocity range, where the trendlines for neighbouring jet sizes cross over each other, indicating a distinct effect of the orifice size, rather than just a velocity effect. Similar effects, but to a different extent, were observed in the three-dimensional set-up [25]. Measurements of the initial solids concentration in the jet have been made using the two-dimensional fluidised bed, shown in Figure 5, which was equipped with optical glass walls for the specific purpose of video recordings with a high resolution camera [23].…”

“…To establish these profiles for a given orifice size and velocity, several parameters, such as the jet angle and height, and the initial solids concentration at the jet exit need to be specified.All these parameters are difficult to measure, especially in a threedimensional bed. A number of measurements have been carried out in two-dimensional and three-dimensional (cylindrical) fluidised beds, using various measurement techniques [12][13][14][15][23][24][25]. The measurements with two-dimensional beds are only used for input in the two-dimensional version of the hydrodynamic model.…”

“…However, comparison of the model predictions with the experimental data from twodimensional configurations can be used to check the validity of the current approach. Measurements of jet angles in the cylindrical fluidised bed, described in section 3.2, have been carried out using an X-ray facility using salt, dp = 418 flm, and alumina particles, dp = 107 llm [25].…”

A comparison of magnetic resonance, X-ray and positron emission particle tracking measurements of a single jet of gas entering a bed of particles

“…These methods are easy to use in large-scale, opaque industrial systems, but require the use of probes that distort the jet flow. X-ray radiography has been used to image beds non-invasively but early work was limited to projections through the bed which did not allow local values of properties to be calculated in 3D beds (Cleaver et al, 1995, Rowe et al, 1979. Magnetic resonance imaging (MRI) allows non-invasive imaging of gas-solid fluidised beds to a high spatial resolution, hence making it suitable for geometrical studies of jets (Müller et al, 2009).…”

Research of thermomechanical proces during decomposition of high density liquid fuel in the fluidized bed

“…Postoje brojni radovi koji tretiraju tematiku uvoñenja gasa kroz mlaznice distributora za fluidizaciju ili pak vertikalne mlaznice sa dna sloja [68][69][70][71][72][73][74][75][76][77][78].…”