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Abstract

The main purpose of this article is to verify and validate the mathematical description of the airflow around a wind turbine with vertical axis of rotation, which could be considered as representative for this type of devices. Mathematical modeling of the airflow around wind turbines in particular those with the vertical axis is a problematic matter due to the complex nature of this highly swirled flow. Moreover, it is turbulent flow accompanied by a rotation of the rotor and the dynamic boundary layer separation. In such conditions, the key aspects of the mathematical model are accurate turbulence description, definition of circular motion as well as accompanying effects like centrifugal force or the Coriolis force and parameters of spatial and temporal discretization. The paper presents the impact of the different simulation parameters on the obtained results of the wind turbine simulation. Analysed models have been validated against experimental data published in the literature.
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Authors and Affiliations

Andrzej J. Nowak
Tomasz Krysiński
Zbigniew Buliński
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Abstract

The rigid finite element method (RFEM) has been used mainly for modelling systems with beam-like links. This paper deals with modelling of a single set of electrodes consisting of an upper beam with electrodes, which are shells with complicated shapes, and an anvil beam. Discretisation of the whole system, both the beams and the electrodes, is carried out by means of the rigid finite element method. The results of calculations concerned with free vibrations of the plates are compared with those obtained from a commercial package of the finite element method (FEM), while forced vibrations of the set of electrodes are compared with those obtained by means of the hybrid finite element method (HFEM) and experimental measurements obtained on a special test stand.

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Authors and Affiliations

Iwona Adamiec-Wójcik
Andrzej Nowak
Stanisław Wojciech

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Abstract

Dry electrostatic precipitators (ESPs) are widely used for purification of exhaust gases in industrial applications. Maintenance of their high efficiency depends primarily on periodical cleaning of the collecting electrodes (CEs). Dust removal (regeneration of CEs) is realized by inducing periodical vibrations of the electrodes. The paper presents results of vibration modelling of a system of CEs; the results were obtained by means of the finite element method, the hybrid finite element method, the finite strip method and a model formulated using Abaqus. Numerical results are compared with those obtained from experimental measurements. Conclusions concerning numerical effectiveness and exactness of the methods are formulated and reasons for differences are discussed.

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Authors and Affiliations

Iwona Adamiec-Wójcik
Andrzej Nowak
Stanisław Wojciech
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Abstract

This work discusses the heat transfer aspects of the neonate’s brain cooling process carried out by the the device to treat hypoxic-ischemic encephalopathy. This kind of hypothermic therapy is undertaken in case of improper blood circulation during delivery which causes insufficient transport of oxygen to the brain and insufficient cooling of the brain by circulating blood. The experimental setup discussed in this manuscript consists of a special water flow meter and two temperature sensors allowing to measure inlet and outlet water temperatures. Collected results of the measurements allowed to determine time histories of the heat transfer rate transferred from brain to the cooling water for three patients. These results are then analysed and compared among themselves.

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Authors and Affiliations

Dominika Bandoła
Marek Rojczyk
Ziemowit Ostrowski
Joanna Łaszczyk
Wojciech Walas
Andrzej J. Nowak
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Abstract

W dniu 12 marca 2019 roku Zarząd Główny PTH podjął uchwałę o powołaniu komisji ds. opracowania kodeksu etyki. W składzie podanym niżej komisja naj-pierw opracowała projekt, który po wielu dyskusjach, naradach i konsultacjach przyjęła ostatecznie w dniu 30 czerwca 2020 roku. Oprócz projektu kodeksu, komisja przygotowała również drogę jego przyjęcia przy akceptacji możliwie dużego gremium członków PTH. W dniu 22 września 2020 roku projekt kodeksu etyki został zatwierdzony przez prezydium Zarządu Głównego. W tym kształcie trafił do wszystkich oddziałów oraz został przedstawiony na stronie PTH. Poda-no przy tej okazji sposoby przesyłania uwag na ręce komisji. W dniu 31 grudnia 2020 roku zakończył się okres konsultacji i komisja przystąpiła do opracowania go w kształcie możliwie szeroko uwzględniającym przedstawione uwagi. Na posiedzeniu w dniu 26 marca 2021 roku Zarząd Główny PTH podjął uchwałę o przyjęciu „Kodeksu etyki PTH”. Kodeks ten będzie przedstawiony do zatwier-dzenia na najbliższym Walnym Zgromadzeniu Delegatów PTH.
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Authors and Affiliations

Małgorzata Gmurczyk-Wrońska
Marek Kornat
Mariusz Mazur
Andrzej Nowak
Henryk Rutkowski
Rafał Stobiecki
ORCID: ORCID
Dariusz Stola
Rafał Wnuk
Krzysztof Zamorski

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