... with Reynolds number and channel wall impact. The study aimed to provide relevant reference basis to compare and analyze similar scenario under unsteady flow condition. PIV flow blockage turbulent flow rod bundle sub-channel blockage Proceedings of the 2022 29th International Conference on Nuclear...

... Image whether the reactor can operate safely. However, the size of Velocimetry (PIV) technology and the Laser Induced the plate fuel assembly is usually 1-3mm, which is prone to Fluorescence (LIF) technology are used in current paper to blockage accidents[1]. Therefore, it is necessary to carry out...

... Image Velocimetry (PIV) to visualize and measure the flow fields downstream of the blockages. The results show that partial blockages will cause flow reversal. In the backflow zone, vortices are generated downstream of the blockage, causing increase in the resistance. The length of backflow zone...

... of a three-way branch pipe with one branch closed is established to verify the mechanism. The PIV measurement method is used to obtain the change characteristics of the flow streamline and velocity distribution of the closed branch pipe under different working conditions. Tests have shown that due...

... periodically, and the wave phase is inverse. This study shows that the flow field variation caused by rolling motion is different from that caused by pulsating flow, and the flow field of fuel assembly in floating reactor system under ocean condition is further studied. rod bundle rolling motion PIV...

... in the reactor vessel was measured by the Particle Image Velocimetry (PIV) method. The PIV measurement was carried out under the operation of the dipped-type direct heat exchanger (DHX) installed in the upper plenum when 20% of the core fuel fell to the lower plenum and accumulated on the core catcher. From...

... Energy Agency Ibaraki, Japan Akikazu Kurihara Japan Atomic Energy Agency Ibaraki, Japan Katsuji Ishida Ascend Co., Ltd. Ibaraki, Japan Keywords: FBR, Wire Wrapped Pin Bundle, Subchannel, PIV ABSTRACT A sodium-cooled fast reactor is designed to attain a high burn-up core in commercialized fast reactor...

... dismantling operations. Keys words : Dismantling, PIV, Temperature Measurement, Filtration, Cutting tools, Incandescent particle INTRODUCTION The use of mechanical or thermal cutting in decommissioning of nuclear facilities generates a lot of incandescent particles. These particles may be capted...

... with the wrapping wire was measured by PIV (Particle Image Velocimetry) through two sides of the duct tube. Typical flow velocity conditions in the pin bundle were 1.6m/s (Re = 13,500) and 0.36m/s (Re = 2,700). Feature of stream regime in the subchannel existing wrapping wire was visualized in vertical...

... to be checked with detailed experimental data. This paper describes an experimental database obtained using two-dimensional Time Resolved Particle Image Velocimetry (TR-PIV) measurements within a 5 × 5 rod bundle with spacer-grids. One of the unique characteristic of this set-up is the use of the Matched Index...

..., was observed when the flow rate in the main pipe increased. This phenomenon was examined by high-time-resolved Particle Image Velocimetry (PIV). The instantaneous velocity field in a cross section was visualized two-dimensionally using PIV technique, simultaneously with the pressure measurement at multi-points...

... Non-Intrusive Experimental Investigation of Flow Behavior Inside a 5X5 Rod Bundle with Spacer Grids using PIV and MIR Elvis Carlos Yassin Dominguez-Ontiveros Estrada-Perez Hassan Texas A&M University Texas A&M University Texas A&M University College Station, TX College Station, TX College Station...

... Particle Image Velocimetry (PIV) measurement technique. The two phase flow condition corresponds to a drag reduction of 38.4% with void fraction of 4.9%. The present results provide evidence that microbubbles in the boundary layer of a turbulent channel flow can help adjust the eddy size distributions near...