Effect of Ocean Environment on Turbulent Heat Transfer in Lattices
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摘要: 对海洋条件下典型7棒束和4棒束通道内的流体流动传热特性进行理论分析。分析结果表明,在海洋条件下,由于流速的波动,加热管壁上始终有周期性变化的蓄热存在。在7棒束通道内,由于四周壁面和加热管管壁的限制作用,垂直于流动方向的附加力对流体的影响非常小,流体的流动和传热特性主要由轴向湍流强度和入口流速决定。而在4棒束通道内,由于壁面的限制作用比较小,垂直于流动方向的附加力会对流体的流动和传热特性产生显著的影响,也会对雷诺应力的分布产生一定的影响。Abstract: The flowing and heat transfer characteristics of turbulent flow in channels with 7 and 4 fuel bundles in ocean environment is investigated theoretically.In the ocean environment,there is periodic heat accumulation on the channel wall due to the periodic velocity.The effect of rolling motion can be restricted greatly by the wall.In the channel with 7 fuel bundles,the effect of the additional force perpendicular to flowing direction on the flow is weak due to the restriction of the wall.The flowing and heat transfer characteristics is mainly determined by the axial turbulent intensity and inlet velocity.In the channel with 4 fuel bundles,since the restriction of the wall is limited,the effect of the additional force perpendicular to flowing direction on the flowing and heat transfer characteristics is significant.And the additional force perpendicular to flowing direction also has effect on the Reynolds stress.
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Key words:
- Ocean environment /
- Lattice /
- Turbulent flow /
- Heat transfer
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