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首页> 外文期刊>International Journal of Heat and Mass Transfer >High heat-flux accelerator targets: Cooling with liquid metal jet impingement
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High heat-flux accelerator targets: Cooling with liquid metal jet impingement

机译：高热通量加速器目标：通过液态金属射流冲击进行冷却

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摘要

In order to evaluate the performance of jet impingement for high heat-flux cooling, experimental cooling loops based on water and liquid metal jet impingement were designed and constructed. The current liquid metal system, based on an eutectic alloy of gallium and indium (GaIn) with a melting point of 15.7℃, employs an annular inductive electromagnetic pump. The experiments showed that it isyn n capable of accommodating a heat flux of about 20 MW/m~2 over an area of 10~(-4) m~2. The jet velocity is less than 4 m/s and the required differential pressure from the pump is less than 10~5 Pa. In the present work the experimental section is supplemented by a theoretical one in which the cooling capability of impinging jets of liquid metal is modeled. In particular, turbulent flow in a dead end associated with the rear surface of a high-temperature target, and the corresponding heat-transfer process, are considered. The developed novel analytical model embodies the main peculiarities of the heat-transfer process and agrees fairly well with the experimental data. In addition, a detailed direct numerical simulation was done with the STAR-CD code. The gross underprediction of the turbulent heat transfer rate by the STAR-CD code is attributed to overprediction of the eddy viscosity in liquid metal flows.
机译：为了评估射流冲击在高热通量冷却中的性能，设计并构建了基于水和液态金属射流冲击的实验冷却回路。当前的液态金属系统基于熔点为15.7℃的镓和铟（GaIn）的共晶合金，采用环形感应电磁泵。实验表明，它可以在10〜（-4）m〜2的区域内容纳约20 MW / m〜2的热通量。射流速度小于4 m / s，泵所需的压差小于10〜5 Pa。在本工作中，对理论部分进行了补充，其中理论上是液体金属撞击射流的冷却能力被建模。特别地，考虑与高温靶材的后表面相关联的死端中的湍流以及相应的传热过程。所开发的新颖的分析模型体现了传热过程的主要特点，并且与实验数据非常吻合。此外，使用STAR-CD代码进行了详细的直接数值模拟。 STAR-CD代码对湍流传热速率的总体预测不足，是由于对液态金属流中的涡流粘度的过度预测。

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