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Artykuł zawiera analizę porównawczą, która przedstawia możliwość zastosowania prostszego równania do obliczania współczynnika strat liniowych λ. Uproszczenie to polega na zamianie wzoru niejawnego jakim jest równanie Colebrooka-White’a na równanie mniej skomplikowane w obliczeniach. Artykuł przedstawia sześć równań, które mogą sprostać temu zadaniu.
The following article provides a brief introduction to the graph theory. It shows two types of models which have been developed using the graph theory. Additionally presented are conservation equations of mass, momentum and energy. The article covers the three elements of the network such as the they are straight pipe and change of the flow direction and a circular arc. These elements are described...
Carbon nanotubes, since they were identified in 1991 by Prof. S. Iijmia, have been an object of interest for almost all fields of science and industry. Their properties are tested continually, both in the micro and the macro scales. It is predicted nowadays that all three types of nanotube structures have the greatest chances to be applied in electronic and medical industries. Authors of this paper...
The objective of conducting tests was to analyse an influence of the surface of a body being flown around on the values of resisting forces. From the hitherto knowledge of the boundary layer theory, it arises that in the vicinity of the surface of the body being flown around a hydrodynamic boundary layer is created as a result of internal friction forces acting there. In the boundary layer large velocity...
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