Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 03, 2023 - September 06, 2023
In order to avoid boiling transition (BT) conditions in boiling water reactors (BWR), rewetting is an important mechanism in the quenching process. The effect of a droplet from another plate is observed to determine the importance of the effect of the droplet on the rewetting rate. Two metal plates are used for the heat transfer surface while lower ends of the metal plates are sandwiched between brass block columns and heated to 250-300°C. On the other hand, distilled water is pumped from the nozzle at a flow rate of 0.2-0.5 LPM. The nozzle is installed between two plates and sprays water in the left and right directions on the cooling surface. Wetting velocity is measured using continuous images recorded by a thermal imaging camera. Since the heat transfer mechanism of water vapor and droplets is dominant, it is expected that the collision of droplets will increase the rewetting rate.
