Effect of flow structure and colloidal forces on aggregation rate of small solid particles suspended in aqueous solutions

• Autorzy: Tyl Grzegorz , Kondracki Juliusz , Jasińska Magdalena

Identyfikatory

DOI

10.24425/cpe.2021.138936

• Języki publikacji: EN

Abstrakty

EN

In this paper aggregation of small solid particles in the perikinetic and orthokinetic regimes is considered. An aggregation kernel for colloidal particles is determined by solving the convection-diffusion equation for the pair probability function of the solid particles subject to simple shear and extensional flow patterns and DLVO potential field. Using the solution of the full model the applicability regions of simplified collision kernels from the literature are recognized and verified for a wide range of Péclet numbers. In the stable colloidal systems the assumption which considers only the flow pattern in a certain boundary layer around central particle results in a reasonable accuracy of the particle collision rate. However, when the influence of convective motion becomes more significant one should take into account the full flow field in a more rigorous manner and solve the convection-diffusion equation directly. Finally, the influence of flow pattern and process parameters on aggregation rate is discussed.

Słowa kluczowe

EN

aggregation; shear flow; DLVO; particles; colloidal forces; population balance

PL

zbiór; przepływ ścinający; DLVO; cząstki; siły koloidalne; bilans populacji

• Wydawca: Komitet Inżynierii Chemicznej i Procesowej Polskiej Akademii Nauk
• Czasopismo: Chemical and Process Engineering
• Rocznik: 2021
• Tom: Vol. 42, nr 4
• Strony: 369--–389
• Opis fizyczny: Bibliogr. 32 poz., rys., tab.

Twórcy

autor

Tyl Grzegorz

• Faculty of Chemical and Process Engineering, Warsaw University of Technology, ul. Warynskiego 1, 00-645 Warsaw, Poland

autor

Kondracki Juliusz

• Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy

autor

Jasińska Magdalena

• Faculty of Chemical and Process Engineering, Warsaw University of Technology, ul. Warynskiego 1, 00-645 Warsaw, Poland

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