Modelagem computacional de transientes hidráulicos em ventosas de tríplice função e non slam considerando as curvas de admissão e expulsão de ar comerciais

Abstract

This issue uses the air valve with triple function that acts on the admission and / or expulsion of air contained in the pipe. Through the kinetic orifice, it admits air when the pressure inside the tubing becomes lower than atmospheric, and expels after the phenomenon of column separation. In the air inlet region, the "Non Slam" air valve accepts air through the kinetic orifice and expels it through the same orifice. At a certain positive pressure value, the kinetic orifice is closed and a smaller diameter orifice, called a "Non Slam" orifice, is opened, thus cushioning the shock of the liquid columns that were spaced apart. In this, a methodology is proposed for the calculation of the coefficients of admission and expulsion of air in the transient flow from the curves made available by the manufacturers. The aim of this work is to minimize the lack of experimental information about air valves based on manufacturers' curves for the determination of air intake and expulsion coefficients. In this study we compared the effect of using a single air discharge coefficient for input and a single one for the air output versus considering the variation of these discharge coefficients as the pressures vary with the software in Java, UFC7.