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首页> 外文期刊>International Journal of Heat and Mass Transfer >Nanoparticle deposition effects on the minimum heat flux point and quench front speed during quenching in water-based alumina nanofluids
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Nanoparticle deposition effects on the minimum heat flux point and quench front speed during quenching in water-based alumina nanofluids

机译：纳米颗粒沉积对水基氧化铝纳米流体淬火过程中最小热通量点和淬火前沿速度的影响

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摘要

The quenching characteristics of metallic rodlets and spheres were investigated in pure water and water-based nanofluids with alumina nanoparticles of 0.1% by volume. The experiments were performed at both saturated and subcooled conditions under atmospheric pressure. The results demonstrate that while the initial quenching behavior in nanofluids is identical to that in pure water, both the minimum heat flux point temperature and quench front speed are significantly enhanced in subsequent quenching repetitions due to nanoparticle deposition. The nanoparticle effects on the quenching process were analyzed with focus on the intermittent liquid-solid contacts in the film boiling regime. It appears that the liquid-solid interaction during such short-lived contacts is more vigorous when a nanoparticle layer with improved surface wettability and roughness is present, which leads to the premature disruption of film boiling and quenching acceleration.
机译：在纯水和氧化铝纳米颗粒的体积为0.1％的水基纳米流体中研究了金属小球和球的淬火特性。实验是在大气压下在饱和和过冷条件下进行的。结果表明，尽管纳米流体的初始猝灭行为与纯水中的初始猝灭行为相同，但由于纳米颗粒的沉积，最低热通点温度和猝灭前沿速度在随后的猝灭重复中均得到了显着提高。分析了纳米颗粒对淬火过程的影响，重点是在薄膜沸腾状态下间歇性的液-固接触。当存在具有改善的表面润湿性和粗糙度的纳米颗粒层时，似乎在这种短寿命接触期间的液-固相互作用更加剧烈，这导致膜沸腾和淬灭加速的过早破坏。

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