Explorations on the multi-scale flow structure and stability condition in bubble columns

CFD-PBM approach with modified drag model for the gas–liquid flow in a bubble column

“…On the basis of previous work by Yang et al (Chen et al, 2009;Yang et al, 2010;Yang et al, 2007;Yang et al, 2011) …”

“…(Schiller and Naumann, 1935) While for larger bubble size, a model was proposed by Ishii and Zuber,(Ishii and Zuber, 1979) which is suitable for various shapes of bubbles such as sphere, ellipse and cap shape. (Ishii and Zuber, 1979;Xu et al, 2013) Recently, Yang et al (Yang et al, 2011) suggested a dual-bubble size (DBS) model, (Chen et al, 2009;Yang et al, 2010;Yang et al, 2007) where the force balance equations of two bubble classes are closed via a stability condition. Afterwards, they developed a stability-constrained multi-fluid (SCMF) model for the CFD simulation of bubble columns.…”

Focusing on the meso-scales of multi-scale phenomena—In search for a new paradigm in chemical engineering

“…Similar compromise between dominant mechanisms at mesoscale also exists in gas-liquid systems such as bubble columns, and the extension of the multi-scale modeling strategy of EMMS to gas-liquid systems is therefore straightforward (Zhao, 2006;Ge et al, 2007a;Yang, Chen, Zhao, Ge, & Li, 2007;Yang, Chen, Ge, & Li, 2010). The total energy consumption N T can be decomposed into three portions.…”

Approaching virtual process engineering with exploring mesoscience

“…In addition, the prediction of drag by the EMMS model, EMMS drag, was integrated with commercial CFD codes to examine gas-solid two-phase flows [38,39] and gas-liquid systems [40], all resulting in better predictions. The EMMS drag model has now been applied widely because of its effectiveness at upgrading CFD.…”

“…The EMMS drag model has now been applied widely because of its effectiveness at upgrading CFD. Extensive studies has been carried out at our institute by validating the model via simulations of the various aspects of the hydrodynamics of lab and pilot scale CFB units [38,39,[41][42][43][44][45][46][47][48][49][50][51][52][53][54][55], studying its relationship with classical continuum models and therefore formulating structure-dependent continuum models [56][57][58][59][60], doing various industrial projects [61][62][63][64][65][66][67][68] and extending the model to (i) consider the effect of heat and mass transfer as well as chemical reaction [69][70][71][72][73], (ii) consider the effect of particle size distribution [74,75], (iii) simulate the hydrodynamics of bubbling and turbulent fluidization [76][77][78][79] and (iv) the gas-liquid and gas-liquid-solid systems [40,[80][81]…”