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Stability of (Y-Q) characteristic

Pochyly F., Haluza M.

Zeszyty Naukowe Politechniki Świętokrzyskiej. Nauki Techniczne

2008

Z. 10, Vol. 2

149-156

For the impeller pumps is very important to have the stable (Q,Y) characteristic. In this article is derived the influence of dissipative energy on (Q,Y) stability and main results for terms affecting this phenomenon.

Adhesive forces at a solid-liquid interface

Pochyly F., Fialova S., Rinka L.

Zeszyty Naukowe Politechniki Świętokrzyskiej. Nauki Techniczne

2008

Z. 10, Vol. 1

245-252

The contribution subject is the adhesive forces at the solid-liquid interface study. The adhesive forces effect is characterized by so called surface energy. On the Victor Kaplan department of fluid engineering there is installed a special device for the surface energy measurement. By this device usage will be presented the surface energy measurement results of different surfaces used in the hydraulics and aeronautics. On the result base will be derived the dissipative function rate of these materials in reference to glass. This rate represents the hydraulic losses. Moreover it'll be set the new boundary condition for the partial slip (partial wettable) surfaces.

Mathematical modelling of oil film bearing

Kucera P., Malenovsky E., Pochyly F.

Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska

2003

nr 21

147-152

The problem is mathematical modelling of oil film bearing at the rotary system. The new access comes from Navier-Stokes equation of fluid, supported by equation of continuity and Bezier's body. In this article is note the solution of mathematical model of fluid film bearing by perpendicular and especially by non-dimensional coordinates. There was inserted modelling problem in this article, in which we are modelling the trajectory of centre of the shaft under fluid film bearing, where the count have been carried by non-dimensional coordinates.