Study of cavitation due to water hammer in plastic pipes
AbstractThe phenomenon of cavitation caused by water hammer in polyethylene and poly(vinyl chloride) plastic pipes has been studied. Experiments have shown that at the end of the boiling phase, rapidly changing pressure oscillations occur, having an initial amplitude possibly greater than 8 MPa, exceeding by many times the maximum increase in water hammer pressure. Vapour cavitation oscillations are of a wave character with gradually increasing frequency. The liquid evaporation duration and amount of stream pressure reduction in steady flow was observed to influence directly the maximum increase in cavitation wave pressure. Increased pressure reduction was accompanied by gas desorption from the liquid, which reduces the amplitude of pressure oscillations and at the same time increases their period. Graphical characteristics, showing the influence of the evaporation time and pressure reduction on the maximum increase in cavitation pressure, were determined. The period of vapour cavitation pressure waves decreased from 3.5 to 1.5 ms. When intensive air desorption in a stream occurred, forced by pressure reduction in steady flow, the period at the first phase could be as much as 6 ms.
|Journal series||Plastics rubber and composites processing and applications, ISSN 0959-8111|
|Keywords in English||Ariete hidraúlico, Canalisation, Canalización, Característica temporal, Caractéristique temporelle, Cavitación, Cavitation, Coup bélier, Défaut, Defect, Defecto, Estudio experimental, Ethylène haute densité polymère, Ethylène moyenne densité polymère, Etileno alta densidad polímero, Etileno mediana densidad polímero, Etude expérimentale, Experimental study, High density ethylene polymer, Mécanisme, Mecanismo, Mechanism, Medida presión, Medium density ethylene polymer, Mesure pression, Pipe, polyvinyl chloride, pressure measurement, Time curve, Vinílico cloruro polímero, Vinylique chlorure polymère, water hammer|
|Publication indicators||= 3|
|Citation count*||15 (2014-08-17)|
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.