Abstract: The behavior of inclusions in the submerged entry nozzle has direct effect on the cleanliness of steel. The installation of an inclusion adsorption rod, i.e. an extension rod on the stopper end was proposed. The effects of the rod length and groove structure on fluid flow and inclusions behavior in the submerged entry nozzle were investigated via physical model experiments with plastic particles to simulate inclusions. The results show that rectangular groove is benefit for inclusions assembling, but the inclusions out of the groove have a little chance to enter it, and the maximum impact area ratio was 33 %. For parallelogram-shaped grooves, the inclusions are able to enter the 45 groove and the maximum impact area ratio was over 48 %, but it is not benefit for inclusions assembling.

Key words: submerged entry nozzle, adsorption rod, inclusion, physical simulation