Modelling of Diffusion in Random Packings of Core-Shell Particles

2017-04-01
Hatipoğlu, Emre
Koku, Harun
Core-Shell particles are commonly used materials in chromatography. In this study, a mathematical model that mimics diffusion around Core-Shell particles was developed. A random-walk based algorithm was implemented to simulate diffusion and a Core-Shell particle geometry was computationally formed, based on simple geometric constructs and relations. Diffusion simulations were carried out on a randomly packed geometry formed from these particles. The behavior of time-dependent diffusivity data obtained from the model was found to be consistent with prior literature data from nuclear magnetic resonance experiments where transient diffusivity of a self-diffusing substance was measured in porous media.
Hacettepe Journal of Biology and Chemistry

Suggestions

Modeling of spherulite microstructures in semicrystalline polymers
Oktay, H. Emre; Gürses, Ercan (2015-11-01)
Semicrystalline polymers are composed of crystalline structures together with amorphous polymer chain networks and therefore they exhibit deformation mechanisms of both crystalline materials and amorphous polymers. One of the most common microstructures observed in semicrystalline polymers is the spherulite microstructure in which crystalline lamellae are embedded in a matrix of amorphous material and grow out from a common central nucleus in radial directions. The mechanical behavior of semicrystalline pol...
Diffusion and reaction in catalyst pellets with bidisperse pore size distribution
Doğu, Timur (1998-06-01)
Catalysts with bidisperse pore structures are extensively used in chemical industries. In such catalysts, diffusion and reaction in the microporous particles are preceded by diffusion in the macropores. The relative significance of macro-and micropore diffusion resistances on the observed reaction rates with Linear and nonlinear rate forms, heat effects, catalyst deactivation and selectivity problems in bidisperse catalysts are investigated in number of published works. In this article, a review of the mode...
Theoretical and experimental investigation of aqueous liquids contained in carbon nanotubes
Yarin, AL; Güvenç Yazıcıoğlu, Almıla; Megaridis, CM; Rossi, MP; Gogotsi, Y (2005-06-01)
The dynamic response-as caused by different means of thermal stimulation or pressurization-of aqueous liquid attoliter volumes contained inside carbon nanotubes is investigated theoretically and experimentally. The experiments indicate an energetically driven mechanism responsible for the dynamic multiphase fluid behavior visualized in real time with high spatial resolution using electron microscopy. The theoretical model is formulated using a continuum approach, which combines temperature-dependent mass di...
Applicability of the power model to mixed slurries with non-spherical particles and networking effect
Kutukcu, Basak; Ayrancı Tansık, İnci (Elsevier BV, 2018-10-01)
Industrial applications of solids suspension generally consist of mixed slurries that contain many solid phases with irregularly shaped particles at high concentrations. Since solid-liquid mixing is a power intensive operation it is critical to predict the just suspended speed, N-j(s), accurately. There is only one model available for mixed slurry N-js predictions: the power model. This model was developed for spherical particles. In this study, suspension behaviour of mixed slurries with non-spherical part...
3-dimensional measurements of morphological properties of particles
Hicyilmaz, C; Bilgen, S (1996-09-26)
Morphological properties of particles are important in mineral processing. Flotation recoveries are affected by surface roughness and acuteness of particles. A novel technique was developed to measure the morphological properties of particles 3- dimensionally. Pyrite sample ground in autogeneous and ball mill to differentiate the surface properties was used in this study.
Citation Formats
E. Hatipoğlu and H. Koku, “Modelling of Diffusion in Random Packings of Core-Shell Particles,” Hacettepe Journal of Biology and Chemistry, pp. 269–275, 2017, Accessed: 00, 2021. [Online]. Available: http://www.hjbc.hacettepe.edu.tr/journal/volume-45/issue-2/modelling-of-diffusion-in-random-packings-of-core-shell-particles/index.html.