Siberian Federal University

Issue

Journal of Siberian Federal University. Engineering & Technologies. 2014 7 (7)

Authors

Kulagin, Vladimir A.; Sokolov, Nikita Y.

Contact information

Kulagin, Vladimir A.:Siberian Federal University 79 Svobodny, Krasnoyarsk, 660041, Russia; Sokolov, Nikita Y.:Siberian Federal University 79 Svobodny, Krasnoyarsk, 660041, Russia

Keywords

cavitation; microcavities; pipeline systems; the gap equation of water hammer; accounting energy losses

Abstract

The paper presents a theoretical justification of cavitations in piping systems. One of the simplest theoretical estimates of discontinuous stress assessment is made on the assumption that the break occurs at the micro cavities , the size of which in order of magnitude equal to the average distance between the molecules. Making the assumption that a fracture will occur when the tensile strength values of capillary forces on the bubble surface, which conditionally replaced micro cavity can determine the value of these stresses by using Laplace’s formula. To calculate the complex pipeline can be successfully used the equation N.A. Kartvelishvili obtained based on the equation Allievi. Produced records frictional energy losses when the regulation does not occur, there is an increase of errors at each step of the calculation. This phenomenon is explained by the peculiarities of the phenomenon of wave reflection from obstacles with a constant increase in amplitude. In [1] we found the equation of water hammer considering energy loss. Derived equation strike and friction. By solving the system of equations can obtain information about the nature occurring in the hydraulic transient phenomena

Pages

872-880

Paper at repository of SibFU

https://elib.sfu-kras.ru/handle/2311/16538

This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0).