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Overview of application options for vertical axis wind turbines

Kuczyński Waldemar, Michalska-Pożoga Iwona, Szczepanek Marcin, Chmiel Krzysztof

Archives of Thermodynamics

2023

Vol. 44, no 4

665--704

The article presents an analysis of the use of Savonius wind turbines with vertical axis of rotation. The first part presents an analysis of the literature with the dentification of the properties of the basic atmospheric parameters related to the air movement referred to as wind. Used mathematical descriptions used in the analysis of air movement and enabling the identification of basic thermodynamic parameters of wind turbines with a vertical axis of rotation were presented. Then, the historical background of the development of wind turbines with a vertical axis of rotation was presented, and constructions of this type currently used were described. Proposals for modification of the configuration and design of Savonius rotors and the impact of these activities on their efficiency were analyzed. These issues were presented in relation to the experimental work carried out in the international research centers. Obvious advantages and disadvantages of using this type of equipment in the field of wind energy were indicated.

Atomic force microscopy with fractal studies of temperature induced changes in the surface topography of polymeric materials

Rydzkowski Tomasz, Kulesza Sławomir, Bramowicz Mirosław, Michalska-Pożoga Iwona

Polimery

2020

T. 65, nr 1

25--32

Changes in the surface topography of polymeric materials can be analyzed to find the correspondence between observed surface features and specific external factors that might also influence physical and functional properties of the investigated material. In this work, atomic force microscopy (AFM) measurements were carried out to investigate the thermal changes in the surface topography as well as in the inner structure of the low density polyethylene (LDPE) samples subjected to 10 recirculations (rLDPE). For better assessment, fractal analysis and AFM results were additionally compared to DSC tests results.

Analiza zmian topografii powierzchni materiałów polimerowych pozwala wyznaczyć zależności między obserwowanymi cechami powierzchni a określonymi czynnikami zewnętrznymi, które mogą wpływać na właściwości fizyczne i funkcjonalne badanego materiału. W niniejszej pracy metodą mikroskopii sił atomowych (AFM) oceniano zmiany termiczne topografii powierzchni, a także wewnętrznej struktury próbek polietylenu małej gęstości (LDPE) poddanych 10-krotnej recyrkulacji (rLDPE). Wyniki AFM i analizy fraktalnej porównywano z wynikami badań metodą różnicowej kalorymetrii skaningowej (DSC).