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首页> 外文期刊>International Journal of Heat and Mass Transfer >Experimental investigation of the cryogenic LN_2-cooling performance for an impinging jet configuration for different inflow conditions
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Experimental investigation of the cryogenic LN_2-cooling performance for an impinging jet configuration for different inflow conditions

机译：不同流入条件撞击喷射配置的低温LN_2冷却性能的实验研究

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摘要

This work focuses on the cryogenic impingement cooling performance depending on the given inflow conditions. An experimental setup is presented which allows a detailed observation of the time dependent temperature distribution in a solid body via a thermal imaging camera during the cooling process. The space- and time-dependent heat transport from the solid to the impinging fluid is calculated from the gained temperature data using the so-called inverse global integration method (IG1M). This method allows an accurate determination of the heat flux density without the necessity of a precise calculation of the sensible temperature gradients. An investigation of the LN_2-impingement conditions such as mass flow rates and fluid density is conducted to bridge the gap between the inflow conditions and the resulting heat fluxes. Moreover, a variation of the working pressure and the nozzle geometry is also performed to assess the main dependencies of the cooling performance. Thus, some important conclusions regarding the heat flux and its governing physical phenomena can be drawn. In order to simplify the application of the gathered information, the corresponding heat transfer coefficients are calculated as a function of the time dependent surface temperature and the set inflow conditions. It is shown that the usage of a constant value results in a high inaccuracy because the heat flux density and the heat transfer coefficient show no trivial correlation for arbitrary impingement conditions.
机译：这项工作侧重于低温冲击冷却性能，这取决于给定的流入条件。提出了一种实验装置，其允许在冷却过程中通过热成像相机进行实心依赖性温度分布的时间依赖温度分布。使用所谓的逆全球集成方法（IG1M）从所需的温度数据计算来自固体到撞击流体的空间和时间依赖的热传输。该方法允许准确地确定热通量密度，而无需精确计算可明智的温度梯度。进行对LN_2冲击条件的研究，例如质量流量和流体密度，以弥合流入条件与所得热通量之间的间隙。此外，还执行工作压力和喷嘴几何形状的变化以评估冷却性能的主要依赖性。因此，可以绘制关于热通量及其控制物理现象的一些重要结论。为了简化收集信息的应用，相应的传热系数被计算为时间依赖性表面温度和设定的流入条件的函数。结果表明，由于热通量密度和传热系数显示出对任意冲击条件的差异相关性，因此恒定值的使用产生了高度的不准确性。

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