Simultaneous measurement of interfacial shear stress and jet shape using multi-sectional PIV and the 3D-LIF method

Masaki, Naoto*; Horiguchi, Naoki   ; Kaneko, Akiko*; Yoshida, Hiroyuki  

During a severe accident in a light water reactor, molten fuel can enter a water pool with atomization and accumulate as debris on the floor. Atomization is important to estimate debris sedimentation, and the interrelationship between interfacial shear stress and jet shape is a key aspect of the atomization process. To investigate this interrelationship, we have developed a simultaneous measurement method for interfacial shear stress and jet shape. However, this method was adapted to a cylindrical jet with a three-dimensional shape, and the positioning of a cross-section for PIV at the jet center was an additional issue. In this presentation, to solve these issues, we will show the result of obtaining interfacial shear stresses in cross-sections with a three-dimensional interfacial shape by simultaneous measurement using multi-sectional PIV and the 3D-LIF method.