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首页> 外文期刊>International Journal of Heat and Mass Transfer >Comparison of steady and transient flow boiling critical heat flux for FeCrAl accident tolerant fuel cladding alloy, Zircaloy, and Inconel
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Comparison of steady and transient flow boiling critical heat flux for FeCrAl accident tolerant fuel cladding alloy, Zircaloy, and Inconel

机译：FeCrAl耐事故燃料包层合金，Zircaloy和Inconel的稳态和瞬态流沸腾临界热通量的比较

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Steady and transient (with a heating rate of 685 degrees C/s) internal-flow CHF (Critical Heat Flux) experiments were conducted under atmospheric pressure at a fixed inlet temperature (40 degrees C or 60 degrees C) and mass flow (300 kg/m(2) s) on Fe-13Cr-6Al alloy, Inconel 600 and Zircaloy-4 tube samples. Multiple experiments were repeated on the same specimen to investigate the effect of surface characteristic changes (i.e., roughness, wettability, and oxide scale morphology) on the occurrence of CHF. Despite notable changes of wettability, roughness, and oxide layer characteristics on samples that had already been subjected to CHF, measured flow CHF remained unchanged throughout repeated experiments for tested materials. This demonstrates that the surface effects on flow CHF are limited in the test conditions. In the steady-state flow boiling condition, Fe-13Cr-6Al alloy demonstrated a 22% and 14% increase in CHF compared to Zircaloy-4 and Inconel 600, respectively. Compared to the 2006 Groeneveld CHF lookup table, Fe-13Cr-6Al alloy gives a 13% increase in the tested flow boiling condition. Material properties are considered primarily responsible for the observed CHF differences among the tested materials. The surface thermal economy parameter ((rho c(rho))(3/2)/root k) is proposed as an explanation for the observed CHF differences; this parameter is related to material's ability to avoid an irreversible dry spot formation. The apparent disagreement of Zircaloy-4 CHF with both the look up table predictions and Inconel 600 shows the limitation of departure of nucleate boiling (DNB) evaluations that do not consider cladding materials. The transient Fe-13Cr-6Al CHF is 39% and 23% higher than the lookup table prediction and the steady-state condition experimental result, respectively. (C) 2018 Elsevier Ltd. All rights reserved.
机译：在大气压下，在固定的入口温度（40摄氏度或60摄氏度）和质量流量（300千克）下，进行稳态和瞬态（升温速率为685摄氏度/秒）内流CHF（临界热通量）实验。 / m（2）s）在Fe-13Cr-6Al合金，Inconel 600和Zircaloy-4管样品上。在同一样品上重复多次实验，以研究表面特征变化（即粗糙度，润湿性和氧化物垢形态）对CHF发生的影响。尽管已经进行过CHF的样品的润湿性，粗糙度和氧化层特性发生了显着变化，但在对被测材料进行的重复实验中，实测流量CHF保持不变。这表明在测试条件下，对流量CHF的表面影响是有限的。在稳态流动沸腾条件下，与Zircaloy-4和Inconel 600相比，Fe-13Cr-6Al合金的CHF分别提高了22％和14％。与2006年Groeneveld CHF查找表相比，Fe-13Cr-6Al合金的测试沸腾条件增加了13％。材料性能被认为是造成测试材料之间观察到的CHF差异的主要原因。建议使用表面热经济参数（（rho c（rho））（3/2）/根k）来解释观测到的CHF差异；该参数与材料避免不可逆的干斑形成的能力有关。 Zircaloy-4 CHF与查找表预测和Inconel 600的明显差异表明，不考虑包层材料的核沸腾（DNB）评估的局限性。 Fe-13Cr-6Al瞬态CHF分别比查找表预测值和稳态条件实验结果高39％和23％。 （C）2018 Elsevier Ltd.保留所有权利。

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