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CFD modeling of droplet generation process for medical applications using the electrostatic impulse method

Cendrowski Piotr, Kramek-Romanowska Katarzyna, Lewińska Dorota, Grzeczkowicz Marcin, Korycka Paulina, Krzysztoforski Jan

Chemical and Process Engineering

2022

Vol. 43, nr 3

331-–355

The electrostatic impulse method is an established method for producing microbeads or capsules. Such particles have found application in biomedical engineering and biotechnology. The geometric properties of the droplets – constituting precursors of microbeads and capsules – can be precisely controlled by adjusting the geometry of the nozzle system, the physical properties and the flow rate of the fluids involved, as well as the parameters of the electrostatic impulse. In this work, a method of mathematical modeling of the droplet generation process using the electrostatic impulse method in a single nozzle system is presented. The developed mathematical model is an extension of the standard Volume of Fluid (VOF) model by addition of the effect of the electric field on the fluid flow. The model was implemented into the OpenFOAM toolkit for computational fluid dynamics (CFD). The performed CFD simulation results showed good agreement with experimental data. As a result, the influence of all process parameters on the droplet generation process was studied. The most significant change in droplet generation was caused by changing the electrostatic impulse strength. The presented modeling method can be used for optimization of process design and for studying the mechanisms of droplet generation. It can be extended to describe multi nozzle systems used for one-step microcapsule production.

Metody diagnostyczne przydatne podczas wykonywania przeglądów obiektów budowlanych

Hoła J., Schabowicz K.

Materiały Budowlane

2013

nr 2

53-57

The paper deals with diagnostic methods helpful in conducting surveys of building structures aimed at evaluating their usability. Attention is drawn to the fact that diagnostic methods need to be used as part of such surveys since they increase the reliability and quality of the evaluation made. A concise survey, classification and description of selected diagnostic methods are presented. The focus is on the state-of-the-art nondestructive methods highly suitable for the purpose. Examples of their practical application are provided. It is emphasized that the current development of test methods is oriented towards the evaluation of other than strength characteristics of members and structures. It is pointed out that this development clearly tends towards the design of equipment enabling one to obtain precise images of the “inside” of the investigated member. Owing to this the workmanship of the particularmembers of a building structure and of the whole structure can be more fully evaluated, which is great consequence for their durability.