the 13th International Congress on Advances in Civil Engineering, İzmir, Turkey, 12 - 14 September 2018
Liquid slugs trapped in a voided line may damage the pipe systems used in thermal power plants. Problems in those plants have been reported in the literature. In order to prevent the failures of the pipes, the impact pressures due to slugs should be predicted as accurately as possible. In the present study, slug motion is experimentally investigated. Experiments are conducted to measure impact force due to slug flow for a larger pipe diameter which represent the real piping systems better. An inclined pipe is used in the experiments, which is connected to a pressurized air tank and between them a ball valve is located. A slug mass or the initial slug length before each experiment can be set at the lower part of the pipe by using a water tank at the upstream. By opening the valve the liquid slug is accelerated due to the pressurized air at the tank and hits 90o degree elbow located at the downstream end of the pipe. After the elbow, the system is open to atmosphere with a short pipe segment. The pipe is rigidly attached to air tank and concrete floor. Due to extensive anchoring, the pipe can be assumed to be rigid and constrained from axial movement induced by the slug impact. To measure the pressure history, a pressure transducer is installed on the elbow.Peak pressures at the elbow are measured for different initial slug lengths. The experimental results obtained in this study can be used to validate different numerical approaches.