Investigation of the effect of passive vortex inserts of different geometrical shapes on the vibrations reduction efficiency in pipelines with two-phase flow

Abstract

Abstract. This paper describes the experimental test bench used in coolant flow research with application of adjusted optical laser system. It is based on the technology of pulsed particle visualization of micro tracers, i.e. Particle Image Velocimetry (PIV system) that allows for the analysis of the microstructure of the hydrodynamic liquid flow passed through the vortex inserts. Optical measurement (PIV-method) of hydro-and aerodynamic characteristics of the coolant flow allowed obtaining the velocity distribution in straight and various curved sections of the pipeline in order to reliably define the vortex formation condition and the occurrence of the pressure gradient on the outer and inner walls of the curved sections. This gives us the opportunity to verify the calculation models describing the problem of passive control (decrease) of the displacement of pipelines of power equipment, and thus to improve the reliability and safe operation of the system in general.

Sustainable energy: Is it nuclear or solar for African Countries? Case study on Ghana

“…In order to avert such accidents, the IAEA has instituted requirements for countries interested in the construction of NPPs to meet before issuing getting the final certification for construction. Construction of an NPP requires a site free from earthquakes hence a special investigation on the geotectonic environment must be conducted with modern engineering equipment to avert any misfortune [60][61][62][63][64]. Factors which can cause nuclear accidents can be classified into two namely: external and internal factors, the external factors include earthquakes, volcanoes, tsunamis and terrorism.…”

Experimental study in reduction of two phase flow induced vibration

“…Vladimir I. Velkin et al (2017) [9] showed in our study a PIV flow visualization of twisting using the passive inserts. It demonstrated that, the use of passive device within the loading line can reduce the vibration level due to flow induced vibration in a remarkable manner.…”