TWO-FLUID INTERACTION AND WOOD’S METAL MELTING PROCESS SIMULATION IN THE SEVERE NUCLEAR ACCIDENT USING MOVING PARTICLE SEMI-IMPLICIT METHOD

• Main Author: Nuril Hidayati, Anni
• Format: Theses
• Language: Indonesia
• Subjects: Fisika
• Online Access: https://digilib.itb.ac.id/gdl/view/32642
• Institution: Institut Teknologi Bandung

The interactions of two fluids and melting process of Wood’s Metal have been studied through experiment and simulation by using Moving Particle Semi-Implicit (MPS) method. MPS has been developed by Koshizuka and Oka in 1996. MPS method is a particle method based on the Lagrangian calculation for incompressible medium and does not rely on grid system. The experiments were conducted in an acrylic box with the dimension 150 mm x 40 mm x 30 mm and a bottle with height of 100 mm and the nozzle of bottle was 26 mm. The Water and cooking oil has been used in this experiment. The results show that in the same height, water will be more difficult to be moved than cooking oil because water has bigger density. The distance between nozzle and fluid surface inside the box will affect at the pressure which is received by the fluid. Higher distance will create higher pressure so that fluid inside the box will be moved easier and more fluid will split out to the box. The second simulation is melting process of WMP due to heat transfer from molten WM which was based fro Sudha’s experiment (2018). The initial temperature conditions were set for the molten wood’s metal and the WMP at 573 K and 300 K, respectively. In this simulation WMP has a length of 470 mm and 7 mm thickness. The results show that molten wood’s metal descends quickly within 0.4 s until it impinges the WMP and lead the hole-formation in the center of plate. At the top and bottom side of WMP there were formed hole which diameter were 95 mm and 50 mm, respectively. The absolute errors were 1.2% and 1.8% for top formed-hole and bottom formed-hole diameter, respectively. Parametric surveys have been done for analyzing the melting behavior when it impinges the WMP. Initial velocity of molten WM were varied at 0,327 m/s, 0,397 m/s and 0,498 m/s. Molten WM temperature were varied at 523 K, 473 K and 423 K. Moreover, improved MPS can be implemented to analyze the molten material behavior inside nuclear reactor while the severe accident occurs.