Loss of Coolant Accident (LOCA) in the nuclear reactor can cause core dryout that reduces the ability of cooling system to maintain the peak cladding temperature. In the area ahead of the quench front, precursory cooling takes place vigorously before dryout happens. This area also comprises a mechanism of heat transfer between the droplets and the wall, the vapor and the droplets, also the vapor and the wall. On the other hand, several parameters can affect the process between the droplets onto the heated wall, including physical parameters of both the liquid and the wall, also the droplets. The test section consists of either 1 (one) or 2 (two) copper plates which are fixed with brass columns filled with cartridge heaters that heating the plate until the expected temperature. Afterward, the water is sprayed by the nozzle inside the plates, and the movement of quenching liquid film is observed by an infrared camera. Based on the analysis, it is investigated that the effect at the increased of subcooling and flowrate affects the visibility of droplets generated and impacting onto another wall, thus increasing the wetting velocity in the case of 2 (two) plates compared to 1 (one) plate.
Akbari et al. (Wed,) studied this question.