Fluidization dynamics of cohesive Geldart B particles. Part II: Pressure fluctuation analysis

Ma, Jiliang; Ommen, J. Ruud van; Liu, Daoyin; Mudde, Robert F.; Chen, Xiaoping; Pan, Suyang; Liang, Cai

doi:10.1016/j.cej.2019.02.187

Cited by 23 publications

(6 citation statements)

References 66 publications

(99 reference statements)

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“…The results showed that the Reynolds number of 370 was a critical value, which meant that the fluid flow entered into the turbulent flow region. Some other relevant studies were also reported in the literature [13,14].…”

Section: Introductionmentioning

confidence: 92%

“…The experimental data of the particle friction factor for the whole flow, the Forchheimer flow, and the turbulent flow in a sinter bed layer, as shown in Figures 3 and 5, are brought into Equation (14) for regression analysis using the least square method, and the specific values of the fitting parameters k, a 1 , and a 2 are listed in Table 3. In this case, the specific equations of the particle friction factor for different flow regions in a packed bed with sinter particles are determined below.…”

Section: Determination Of the Particle Friction Factormentioning

confidence: 99%

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An Experimental Study of Gas Flow Regime and Pressure Drop in a Random Packed Bed with Sinter Particles

et al. 2021

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The gas flow regime and pressure drop in a gas–solid packed bed with irregularly shaped sinter particles were experimentally investigated. Using a self-made experimental facility for data measurement, the gas flow pressure drop in a sinter bed layer was determined for various experimental conditions. According to the changes in the modified coefficients, α and β, for different flow regimes, the flow transitions from one regime to another in packed beds with different particle diameters were described. Furthermore, the pressure drop correlations for different flow regimes were determined, and the reliabilities of the obtained correlations were contrastively analyzed. The results show that, when the particle diameter is constant, the modified pressure drop per unit height, ΔP/Hu, increases linearly with the increasing gas superficial velocity. When the gas superficial velocity is larger than 1.15 m/s under atmospheric conditions, the gas flow regime in the sinter bed layer is the turbulent flow. Compared with the experimental correlation of the whole flow, the pressure drop correlations obtained by the piecewise fitting method provided a better prediction of the experimental values, and the average deviations of the obtained correlations for the Forchheimer flow and the turbulent flow were 5.31% and 4.07%, respectively.

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Section: Introductionmentioning

confidence: 92%

Section: Determination Of the Particle Friction Factormentioning

confidence: 99%

An Experimental Study of Gas Flow Regime and Pressure Drop in a Random Packed Bed with Sinter Particles

et al. 2021

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“…The increase of dominant frequency in the PSD function demonstrates the transition from bubbling to the turbulent regime. Therefore, the decrease of static bed height facilitates the explosion of bubbles, which reduces the diameter of bubbles, raises the number of bubbles, and improves the fluidization quality [42,43].…”

Section: Effect Of Static Bed Height On Bubble Behaviormentioning

confidence: 99%

Bubble Behaviors in a Dense Gas‐Solids Fluidized Bed: Analysis of Pressure Fluctuation

Qian

et al. 2022

Chem Eng & Technol

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The pressure signals were analyzed by time‐domain and frequency‐domain methods, including standard deviation, autocorrelation function, and power spectral density function, to investigate the bubble behavior and determine the regime transition. Results indicated that the autocorrelation function of pressure signals derived from bubbles was periodic fluctuation. The periodic nature of the autocorrelation function disappeared and the dominant frequency increased when the transition from bubbling to the turbulent regime occurred. The decrease of static bed height facilitated the explosion of bubbles, which accelerated the transition from the bubbling to the turbulent regime. The fluidization index was used as an indicator for the bubble state in the dense fluidized bed.

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“…The fluidization state at different periods of time can be obtained by observing the pressure distribution in various zones of the bed. If the pressure fluctuation keeps at a low level, it can be considered that fluidization of the particular zone is relatively stable [30]. Figs.…”

Section: Characterization Of Pressure Dropmentioning

confidence: 99%

Effect of Liquid Addition on Gas‐Solid Fluidization

Zhao

Liu

et al. 2021

Chem Eng & Technol

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The flow characteristics within a gas‐solid fluidized‐bed reactor can be intensified by adding liquid. Knowledge on the effect of liquid addition on flow characteristics is important to scale‐up and operation of fluidized beds. In the experiments, a cold‐mode fluidized bed loaded with rutile particles is constructed. The effect of addition position and quantity of liquid on the evolution rule of parameters in the fluidized bed is investigated using numerical simulation. The simulation and experimental pressure fluctuations agree well, and numerical results indicate that the insertion depth has a significant influence on the bed central pressure and radial concentration distribution. The agitating effect of liquid on a fluidized bed increases with the insertion depth and liquid‐solid volume ratio.

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Fluidization dynamics of cohesive Geldart B particles. Part II: Pressure fluctuation analysis

Cited by 23 publications

References 66 publications

An Experimental Study of Gas Flow Regime and Pressure Drop in a Random Packed Bed with Sinter Particles

An Experimental Study of Gas Flow Regime and Pressure Drop in a Random Packed Bed with Sinter Particles

Bubble Behaviors in a Dense Gas‐Solids Fluidized Bed: Analysis of Pressure Fluctuation

Effect of Liquid Addition on Gas‐Solid Fluidization

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