Using S-statistic for investigating the effect of temperature on hydrodynamics of gas–solid fluidization

Hydrodynamics of a gas–solid fluidized bed with thermally induced interparticle forces

“…The medium frequency structures belong to the meso-structures and reflect dynamic features of particle clusters. The high frequency components associated with micro-structures, which originate from the motion of a single particle and measured noises in the fluidized bed [53,55]. Johnsson et al [38] showed that the phenomena of different scales can be identified in a logarithmic scale of PSD of pressure signals.…”

Characterization of gas–liquid–solid fluidized beds by S statistics

“…These parameters are selected to maximize differences between two different hydrodynamic regimes and minimize differences between the same hydrodynamic conditions (Fraguío, Cassanello, Larachi, Limtrakul, & Dudukovic, 2007;Shiea et al, 2013;Tamadondar et al, 2013). This criterion was used to select optimal values of l and d. The S values for different combinations of time series were calculated at various l and d, and the l and d that give a maximum value of S (higher than 3) for time series of different hydrodynamic conditions were chosen for the remaining calculations.…”

“…Optimal parameters should provide maximum S values (greater than 3) for two pressure signals measured under different hydrodynamic conditions, and S values of less than 3 for two time series that arise from identical hydrodynamics (Fraguío et al, 2007;Shiea et al, 2013;Tamadondar et al, 2013).…”

“…van Ommen, Coppens, van den Bleek, and Schouten (2000) applied this method to detect agglomeration in gas-solid fluidized beds. Subsequently, Villa, van Ommen, and van den Bleek (2003), Chaplin (2005), Stienstra, Nijenhuis, Kroezen, van den Bleek, and van Ommen (2005), and Tamadondar et al (2013) used this test to monitor and detect early changes, such as foam formation in bubble columns, drying of pharmaceutical granulates, and the effect of temperature in gas-solid fluidized beds in the hydrodynamics of multiphase contactors. Recently, this attractor comparison test was conducted by Shiea, Sotudeh-Gharebagh, Azizpour, Mostoufi, (2013) on vibration signals of a gas-solid fluidized bed to predict the onset of a turbulent regime.…”

Investigation of Hydrodynamics of High‐Temperature Fluidized Beds by Pressure Fluctuations

“…Recently, a few researchers have observed a different trend in changes of the hydrodynamics of air fluidized beds of sand particles against temperature. Using the radioactive particle tracking technique, Sanaei et al 19, 20 and Tamadondar et al 21 reported increasing bubble size by raising the temperature up to 300 °C, followed by a decrease with further increasing the temperature.…”