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首页> 外文期刊>International Journal of Heat and Mass Transfer >Filling dynamics and phase change of molten salt in cold receiver pipe during initial pumping process
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Filling dynamics and phase change of molten salt in cold receiver pipe during initial pumping process

机译：初始泵送过程中冷接收管中熔融盐的填充动力学和相变

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摘要

The filling dynamics and phase change performances of molten salt in cold receiver pipe during initial pumping process are numerically analyzed with variable inlet velocity due to pump characteristic curve. In general, cold receiver pipe during initial pumping process will be frozen for molten salt solidification as the inlet temperature is lower than critical temperature, or else it will be unobstructed with melting process at higher inlet temperature. During pumping process with melting, the flow velocity will first decrease by solidification and then increase by melting effect, and the melting time decreases with inlet temperature. As the freezing phenomena appears during pumping process, the flow velocity will decrease to zero, while the pressure loss reaches the maximum pressure head, and the freezing time increases with inlet temperature. Since a solid layer exists adjacent to the pipe wall in phase change region, the flow velocity and pressure loss remarkably increases along flow direction, and the phase change region will dominate the pressure loss. As the inlet temperature decreases, the phase change region remarkably enlarges, and the filling time rises.
机译：由于泵的特性曲线，在入口速度可变的情况下，对初始接收过程中冷接收管中熔融盐的填充动力学和相变性能进行了数值分析。通常，在初始泵送过程中，由于进口温度低于临界温度，冷接收器管道将被冻结以进行熔融盐固化，否则，在较高进口温度下，其不会因熔化过程而受到阻碍。在熔化的泵送过程中，流速将首先由于凝固而降低，然后由于熔化效应而增加，并且熔化时间随入口温度而减少。当在泵送过程中出现冻结现象时，流速将降至零，而压力损失达到最大压力头，并且冻结时间随入口温度的增加而增加。由于在相变区域中在管壁附近存在固体层，所以流速和压力损失沿流动方向显着增加，并且相变区域将主导压力损失。随着入口温度降低，相变区域显着增大，并且填充时间增加。

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