For natural circulation, it is shown that reverse flow occurs in the inverted U-tubes of the steam generator (SG). The dimensionless analysis was used to deduce the expression of the flow equation, and the factors affecting reverse flow characteristics were also studied, which were the lit and 17h. The results show that, the non-dimensional Ap of extreme point is effected by ilh and Hi, but the non-dimensional velocity is effected by ilf.
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