In this study experiments are conducted on the flow within a horizontal pipe with two closed side branches of equal length. This configuration is referred to as "quasi-cross configuration" as the distance between the two closed side branches is much smaller than the acoustic wavelength of the first acoustic mode. Focus is placed upon investigating of the effect of high amounts of injected water on Flow-Induced Pulsations (FIPs). A first test with only dry air is performed and pressure fluctuations are measured at the closed end of each side branch to investigate FIPs. Several tests are conducted with increasing amounts of water, in droplet form, which is injected with a nozzle positioned upstream the branches. To understand the effect of the multiphase flow pattern, tests are performed with the injector located far from and close to the side branches. With far injector and at low injection rates, no decrease of pulsations is observed while the amount of injected water increases. At high injection rates, a shift of the pulsation peak to lower velocities and an increase of the Strouhal number calculated by using the diameter of the side branch and the superficial gas velocity are reported. With close injector, pulsations are eliminated as the injection rate increases. At low injection rates, an increase of the Strouhal number is also observed.
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