Scaling analysis of a thermal-hydraulic test loop for single-phase natural circulation under dynamic motion condition

According to this necessity of scaling criteria under dynamic motion condition, the similarity criteria under dynamic motion was derived in this study. In addition, the non-dimensional governing equation for the singlephase natural circulation was suggested for practical application. In the present study, the governing equation under dynamic motion was established based on the previous researches and the additional acceleration terms were categorized into translational and rotational ones according to the six-degree of freedom in motion. In order to derive the similarity criteria under dynamic condition for a single-phase test loop, first, the non-dimensional form of governing equation was derived and corresponding similarity criteria was suggested. In result, the two kinds of Strouhal numbers were obtained for the case of translational and rotational motion. It can provide the fundamental form for the derivation of various scaling methods in single-phase natural circulation under dynamic motion. For the future works, the verification study could be carried out using thermal-hydraulic system codes containing dynamic motion model such as MARS for various dynamic environments.