Longitudinal mixing of the liquid phase in bubble columns
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2021, Chemical Engineering Research and DesignCitation Excerpt :Fig. 3 illustrates gas holdup according to orifice size at (a) Psys = 0.1 MPa and (b) Psys = 3.5 MPa with ϕo = 0.128%. Previous studies have reported that hole size is a major parameter affecting gas holdup under the same type and opening fraction and that hole size reduction can increase gas holdup (Bouaifi et al., 2001; Jia et al., 2007; Ohki and Inoue, 1970; Parasu Veera and Joshi, 2000). These findings are due to facts that the pore size determines the initial bubble size and that gas holdup decreases as larger bubbles form and diffuse rapidly through the liquid.
Bubble rising velocity and bubble size distribution in columns at high pressure and temperature: From lab scale experiments to design parameters
2021, Chemical Engineering Research and DesignA recirculation cell approach for hydrodynamic and mass transfer modeling in bubble columns with and without internals
2020, Chemical Engineering JournalCitation Excerpt :Schlüter [11] categorized the available BCR models into reactor models and hydrodynamic models, whereas the latter can be turned into rector models accounting for chemical species through considering their specific reaction kinetics. Hydrodynamic models comprise axial and radial dispersion models [21,23,24], circulation flow models [25–27], compartment and bubble class models [28–31] as well as cell models [32]. CFD approaches involve highest hydrodynamic complexity [33,34], however, shall not be further addressed here as the computational afford is too high.
Hydrodynamics, mixing and mass transfer in a pilot-scale bubble column with dense internals
2019, Chemical Engineering Science