Numerical Investigation of Cavitation on Different Venturi Models

Year 2015, Volume: 20 Issue: 1-2, 22 - 33, 29.07.2016

Sedat Yayla , Shakhwan Yaseen Ali Bahadır Olcay

Abstract

When the pressure in the fluid falls below the liquid's saturation pressure, Cavitation phenomena can severely damage devices or machine parts for example pumps, propellers and impellers. In the current study two-dimensional computational fluid dynamics (CFD) venturi models with variety of inlet pressure values, the throat lengths and vapor fluid contents were employed to examine how cavitation was influenced. In this study two different venturi models were used at various inlet pressures of 2, 4, 6, 8 and 10 atm, throat lengths of 5, 10, 15 and 20 mm and three different vapor contents of 0%, 5% and 10% to unveiled the influence of every parameter on the cavitation number. The investigation unveiled that pressure inlet and vapor fluid content and cavitation number have a positive relationship. It was also discovered that at the inlet pressures of 6, 8,10atm, velocity remains almost constant, however increasing length of throat led to the sharp increase in the velocity of throat at inlet pressures of 2 and 4 atm.  Additionally, there was negative correlation between velocity and cavitation number. The outcomes of the cavitation number were different from 0.092 to 0.495 relying on the velocity values of the throat. 

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