Effect of particles on hydrodynamics and mass transfer in a slurry bubble column: Correlation of experimental data

Abstract

The effects of particle concentration and size on hydrodynamics and mass transport in an air–water slurry bubble column were experimentally studied. When the particle concentration αs increased from 0% to 20%, the averaged gas holdup decreased by ~30%, gas holdup of small bubbles and gas–liquid volumetric mass transfer coefficient decreased by up to 50%, while the gas holdup of large bubbles increased slightly. The overall effect of particle size was insignificant. A liquid turbulence attenuation model which could quantitatively describe the effects of particle concentration and size was first proposed. Semi‐empirical correlations were obtained based on extensive experimental data in a wide range of operating conditions and corrected liquid properties. The gas holdup and mass transfer coefficient calculated by the correlations agreed with the experimental data from both two‐phase and three‐phase bubble columns, with a maximum error <25%.

Numerical Simulation of Mass Transfer Characteristics of Gas–Liquid Bubble Columns and an Improved Mass Transfer Model

“…The simulation results agree well with the experimental results of Guan and Yang using the probe method, with an AD of 4.3%. However, the simulation results are basically a bit lower than the data of Guan and Yang employing the pressure method and the results of Zhang et al, with ADs of 14.7 and 15.4%, respectively. This difference may be owing to the different height-to-diameter ratios in our study and their experiments.…”

“…As shown in Figure 5a, the relationship can be concluded by eq 8 with R 2 of 0.9892. (8) In general, Figure 5b,c present that the simulation data agrees well with the experimental data of Zhang et al 29 (AD = 9.7%). This level of accuracy surpasses those achieved by other models.…”

“…The models are categorized into three groups: those based on the Higbie model, those founded on the eddy cell model, and the empirical correlations. The simulation using these models is compared with the experimental data obtained from Zhang et al, 29 and the resulting ADs are tabulated in Table 4.…”

“…To achieve this goal, first, the appropriate interphase force models that can efficiently improve the accuracy of CFD simulations are proposed. Second, models for aspect ratio and mass transfer coefficient are discussed and compared with the experimental data of Grund 7 and Zhang et al 29 Third, a new mass transfer coefficient model that considers the deformation of the bubble and the effect of bubble swarm is proposed. Furthermore, the new model is applied to conduct a comprehensive investigation of the mass transfer characteristics across different zones of bubble columns operated at various regimes.…”

Numerical Analysis of Particle Injection Effect on Gas-Liquid Two-Phase Flow in Horizontal Pipelines

“…11b, by injecting particles, void fraction increases by 13.7%. This increasing trend is valid as Zhang et al [38] acknowledged that injecting particles increases the void fraction of large bubbles (including slug and plug patterns). While void fraction increases in every case, pressure drop shows more oscillatory behavior and deviates on average by 18%.…”