Investigation of Vibration Amplitude Effect on Local Flow Parameters of Two-Phase Flow

In order to investigate the vibration effect on local two-phase flow parameters,local measurements of two-phase flow parameters including void fraction,Sauter mean diameter and interfacial area concentration were conducted using conductivity probe under vibration condition.The experiment was firstly conducted under static condition.The vibration modes were then imposed on the test section through the rotation of eccentric cam on the top of the test section.The vibration period of the test section was kept at 0.5s and three vibration amplitudes,which were 4.8 mm,9.5 mm and 15.9 mm respectively,were adopted.The experiment results showed that the vibration had very limited effects on the time-averaged local parameters of the gas-water two-phase flow.But the additional inertial force induced by the vibration would significantly change the distribution of local two-phase flow parameters in the annulus and the variations of local flow parameters increased greatly with the vibration amplitude.For the flow condition with lower void fraction,the non-dimensional void fraction peak can reach up to 70% as the vibration amplitude increased to 15.9 mm,but the vibration effect decreased with the increasing of gas flux.