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首页> 外文期刊>International Journal of Heat and Mass Transfer >A mass transfer correlation for packed bed of lead oxide spheres in flowing lead-bismuth eutectic at high Peclet numbers
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A mass transfer correlation for packed bed of lead oxide spheres in flowing lead-bismuth eutectic at high Peclet numbers

机译：高Peclet数下流动的铅-铋共晶中氧化铅球填充床的传质相关性

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摘要

It is widely recognized that the control of the activity of dissolved oxygen is essential for the use of lead-bismuth eutectic (LBE) as primary coolant for nuclear systems. A lead oxide mass exchanger (PbO MX) comprised of a packed bed of lead oxide spheres is a promising solution to regulate the dissolved oxygen activity in the LBE. In order to design and operate a PbO MX properly, the dissolution kinetics of PbO in flowing LBE should be determined. A high-fidelity Computational Fluid Dynamic (CFD) model of solid-to-liquid mass transfer has been developed to determine the mass transfer coefficient of a PbO MX in flowing LBE. We validated the developed CFD model against experimental data obtained from the LBE test loop CRAFT, at SCK · CEN. The model is in good agreement with the experimental data. The effect of the channel to particle diameter ratio (R) on the mass transfer coefficient was evaluated by using the validated model. A mass transfer correlation for PbO MX was obtained, in terms of the Sherwood number, by fitting the simulation results for the general case of a random packed bed with a porosity of about 0.4.
机译：众所周知，控制溶解氧的活性对于使用铅铋共晶（LBE）作为核系统的主要冷却剂是必不可少的。由氧化铅球填充床组成的氧化铅质量交换器（PbO MX）是一种有前景的解决方案，可调节LBE中的溶解氧活性。为了正确设计和操作PbO MX，应确定PbO在流动LBE中的溶解动力学。已经开发了一种高保真的固液传质计算流体动力学（CFD）模型，以确定流动LBE中PbO MX的传质系数。我们对照从SCK·CEN的LBE测试回路CRAFT获得的实验数据验证了开发的CFD模型。该模型与实验数据吻合良好。使用验证的模型评估通道与粒径之比（R）对传质系数的影响。通过拟合孔隙率约为0.4的一般随机填充床的一般情况的模拟结果，获得了以Sherwood数表示的PbO MX的传质相关性。

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