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- W2195060713 abstract "Abstract Mesoscale transport phenomena and mechanisms are essential to achieve a more fundamental understanding on the mass, momentum, and heat transfer in the classical study of transport phenomena and on the mixing, residence time distribution, and rate-limiting analysis in chemical reaction engineering, yet they are now beyond the scope of classical textbooks of chemical engineering. We highlight a heuristic mesoscale modeling approach starting from a conceptual energy-minimization multiscale (EMMS) model and ending at the stability-constrained multifluid computational fluid dynamics (CFD) model. While the stability condition determines the direction of system evolution, the stability-constrained CFD further describes the dynamics of structure evolution. We establish the dual-bubble-size model, an extended EMMS approach for gas–liquid systems. Stability condition is formulated as the minimization of the sum of two energy dissipations, reflecting the compromise of a liquid-dominant regime at which smaller bubbles prevail and a gas-dominant regime favoring the existence of larger bubbles. It supplies a mesoscale constraint for conservation equations and a mesoscale perspective to understand the macroscale regime transition. The model calculation for gas–liquid and gas–solid systems demonstrates the intrinsic similarity of the two systems; the system evolution at macroscale is driven by stability conditions. Theoretically stability condition may offer closure laws for CFD simulation, leading to the stability-constrained multifluid CFD model. While direct integration is difficult, we propose various simplified approaches to derive the closure models for drag, bubble-induced turbulence and correction factors for coalescence rate in population balance equations. The stability-constrained multifluid CFD model shows much advantage over traditional closure models." @default.
- W2195060713 created "2016-06-24" @default.
- W2195060713 creator A5089121880 @default.
- W2195060713 date "2015-01-01" @default.
- W2195060713 modified "2023-10-14" @default.
- W2195060713 title "Mesoscale Transport Phenomena and Mechanisms in Gas–Liquid Reaction Systems" @default.
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- W2195060713 doi "https://doi.org/10.1016/bs.ache.2015.10.007" @default.
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