Influence of an impinging jet on sedimented debris

The presented work is part of a joint research project performed in cooperation between the Forschungszentrum Dresden and University of Applied Sciences Zittau/Goerlitz.
The paper deals with experimental investigations concerning the influence of an impinging jet on sedimented insulation material in a building sump of the reactor containment.
To investigate the influence of an impinging jet a special test facility was designed. The test facility "Tank" was build up with acrylic glass. Thereby it is possible to use laser PIV to measure the flow field and high-speed video to analyze the jet-structure in the test facility. With help of this instrumentation the following experiments were performed:

• Experiments without air entrainment and different distances between pipe outlet and water surface in the test facility.
• Experiments with air entrainment, different distances between pipe outlet and water surface in the test facility and different flow velocities of the impinging jet.
• Experiments with a cold impinging jet and hot water in the test facility for a defined distance between pipe outlet and water surface and a defined jet velocity of the jet.

The main goal of the experiments is to study the physical phenomena of the impinging jet and provide experimental data for verification of CFD models.