SESAME Newsletter #3 (March 2018)
SEEDS Experimental Facility
The SEEDS (SEven rods bundle Experiments in Delft for SESAME) facility is a water-based bundle consisting of seven rods. SEEDS 1 will be used to study vibrations due to turbulence and a phenomenon called coherent structures. The central rod is made of a flexible material. The flow field will be determined with the help of laser doppler anemometry (LDA) and the vibrations are recorded by a fast-speed camera. Later on, the facility will be converted into SEEDS 2, aiming at measuring the flow field in a wire-wrapped bundle geometry.
Specialty is the ability to measure inside the rod bundle. Usually the LDA laser beams are blocked by the rods, but in SEEDS the rods are made of Fluorinated Ethylene Propylene: a material that has the same refractive index as water. In this way, the laser beams can reach the internals of the rod bundle without being refracted.
The data will be used for validation purposes and therefore will improve the capabilities of codes and models to predict flow phenomena in rod bundles of liquid metal reactors.