Experiment and Numerical Study of Water Film/Air Counter-Current Flow Heat Transfer on a Vertical Plate for Passive Containment Cooling System

摘要

The evaporation phenomenon encountered in a configuration of a free falling water film covering a heating surface interacting with a counter-current air flow is widely available in industrial applications, and the current work studied the evaporation heat transfer related to the PCCS (Passive Containment Cooling System) of CAP 1400 in a larger vertical duct with experiment and CFD code Fluent. The experiment facility WAFT (WAter Film Jest) for the current study consisted of a main plate, a glass cover, a rotating frame, a water heating equipment, a water supply and recovery system, air heating and supply system, heating oil supply system, as shown in Figure 1. The dimension of the main plate was 5mXl.2mX0.019m. It was made of carbon steel and its front surface was polished and painted with nonorganic zinc paint as used in AP1000 containment (Carbozinc 11 HSN). Its manufacturing process followed precisely the direction of the AP1000 document. The back side of the plate was welded in 250 thin round copper tubes, and these tubes were parallel with the short side of plate (1.2m) as shown in Figure 2. The heating oil were pumped into the tubes, and the oil temperature can be regulated up to 350℃. The power of heating oil supply equipment was up to 1MW.