Estimation of Heat Transfer Coefficient and Flow Characteristics on Heat Transfer Tube in Sodium-Water Reaction

Investigation of correlation diagram between heat transfer coefficient and void fraction under sodium–water reaction

“…An investigation of the void fraction transient in SWAT-1R experiment is carried out using the present diagram in order to investigate an applicability of the diagram. Since there was no measured data in terms of the velocity near the T/C, the diagram of u B ¼ 1.0m/s is applied firstly to the transient of the heat transfer coefficient investigated in the authors' previous work [3] (for instance, Figure 5). It is mentioned that some data of heat transfer coefficient is eliminated in the conversion into the void fraction when it exceeds the range of the diagram.…”

“…A median value and its standard deviation at each location are summarized in Table 2. As discussed in the previous work [3], a comparative high void fraction (40.7) is investigated at Location A from the beginning of the leakage as seen in Figure 5.…”

“…Since the reaction jet region consists of liquid (sodium and sodium hydroxide) and gas (steam and hydrogen), a magnitude of heat transfer coefficient at the tube surface will vary widely due to its physical properties such as a velocity and a void fraction. The authors have investigated the heat transfer coefficient based on SWAT-1R experiment [2] in the previous work [3].…”

“…The position of T/C and the temperature transient measured in the experiment are summarized in Figures 3 and 4 respectively. As a result of the authors' previous work [3], the heat transfer coefficient has been evaluated in the range of 15,000-128,000 W/m 2 /K as shown in Table 1 and Figure 5. In the SWR, it was observed that the maximum temperature exceeded 1300 K [2] where the deterioration will be initiated.…”