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EnglishWe report on a first-principles numerical study explaining the potential advantage of core-shell particles with strictly radially-oriented mesopores. Comparing the efficiency of these particles with fully porous and core-shell particles with a conventional (i.e., randomly oriented) mesopore network, the present numerical study shows a similar strong reduction in minimal reduced plate height (h(min)) as was very recently observed in an experimental study by Wei et al. (respectively a h(min)-reduction on the order of about 1 and 0.5 reduced plate height-units). As such, the present work provides a theoretical basis to understand and confirm their experimental findings and quantifies the general advantage of "radial-diffusion-only" particles. Determining the effective longitudinal diffusion (B-term contribution) in a series of dedicated, independent simulations, it was found that this contribution can be described by a very simple, yet fully exact mathematical expression for the case of "radial- diffusion-only" particles. Using this expression, the significant increase in efficiency of these particles can be fully attributed to their much smaller B-term band broadening, while their C-term band broadening (representing the mass transfer resistance) remains unaffected.
| Data di pubblicazione: | 2016 | |
| Titolo: | A theoretical study on the advantage of core-shell particles with radially-oriented mesopores | |
| Autori: | Deridder, S; Catani, Martina; Cavazzini, Alberto; Desmet, G. | |
| Rivista: | JOURNAL OF CHROMATOGRAPHY A | |
| Keywords: | Computational fluid dynamics; Diffusion; Efficiency; Mass transfer, Band-broadening; Core shell particles; General plates; Radially oriented pores; Simulations, Shells (structures); B-term band broadening; Computational fluid dynamics; Core-shell particles; General plate height model; Radially oriented pores; Simulations | |
| Abstract in inglese: | We report on a first-principles numerical study explaining the potential advantage of core-shell particles with strictly radially-oriented mesopores. Comparing the efficiency of these particles with fully porous and core-shell particles with a conventional (i.e., randomly oriented) mesopore network, the present numerical study shows a similar strong reduction in minimal reduced plate height (h(min)) as was very recently observed in an experimental study by Wei et al. (respectively a h(min)-reduction on the order of about 1 and 0.5 reduced plate height-units). As such, the present work provides a theoretical basis to understand and confirm their experimental findings and quantifies the general advantage of "radial-diffusion-only" particles. Determining the effective longitudinal diffusion (B-term contribution) in a series of dedicated, independent simulations, it was found that this contribution can be described by a very simple, yet fully exact mathematical expression for the case of "radial- diffusion-only" particles. Using this expression, the significant increase in efficiency of these particles can be fully attributed to their much smaller B-term band broadening, while their C-term band broadening (representing the mass transfer resistance) remains unaffected. | |
| Digital Object Identifier (DOI): | 10.1016/j.chroma.2016.05.062 | |
| Handle: | http://hdl.handle.net/11392/2351257 | |
| Appare nelle tipologie: | 03.1 Articolo su rivista |
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| 11392-2351257_preprint_Catani_Martina.pdf | Pre print | Pre-print | PUBBLICO - Pubblico con Copyright | Open Access Visualizza/Apri |
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