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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Radiation method surface activation on Leidenfrost and quenching phenomena
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Radiation method surface activation on Leidenfrost and quenching phenomena

机译：辐射法对莱顿弗罗斯特表面活化和淬火现象

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Improving the limit of boiling heat transfer or critical heat flux requires that the cooling liquid can contact the heating surface or a high wettability, highly hydrophilic heating surface, even if a vapour bubble layer is generated on the surface. In our previous study, contact angle, an indicator of macroscopic wettability, of a water droplet on metal oxide at room temperature was measured by image processing of the images obtained by a CCD video camera. The results showed that the surface wettability on metal oxide pieces of titanium, zircaloy No. 4, SUS-304, and copper was improved significantly by the radiation induced surface activation (RISA) phenomenon. To delineate the effect of RISA on heat transferring phenomena, the Leidenfrost condition and quenching of metal oxides irradiated by gamma-rays were investigated in this study. In the Leidenfrost experiment, when vapor film existed between the droplet and the metal surface; i.e., a Leidenfrost condition obtained. The wetting limit temperature increased with integrated irradiation dose. After irradiation, the wet length and the duration of contact increased, and the contact angle decreased. In the quenching test, high surface wettability, or a highly hydrophilic condition, of a simulated fuel rod made of SUS was achieved, and the quenching velocities were increased up to 20-30% after 300 kGy Co-60 gamma-ray irradiation. (C) 2004 Elsevier Inc. All rights reserved.
机译：改善沸腾传热或临界热通量的极限要求冷却液可以接触加热表面或高润湿性，高亲水性的加热表面，即使在表面上产生了汽泡层。在我们先前的研究中，通过对CCD摄像机获得的图像进行图像处理，测量了室温下水滴在金属氧化物上的接触角（宏观润湿性的指标）。结果表明，通过辐射诱导表面活化（RISA）现象，钛，4号锆合金，SUS-304和铜的金属氧化物片的表面润湿性得到了显着改善。为了描述RISA对传热现象的影响，本文研究了Leidenfrost条件和伽马射线辐照的金属氧化物的猝灭。在莱顿弗罗斯特（Leidenfrost）实验中，当液滴与金属表面之间存在汽化膜时;即获得莱顿弗罗斯特条件。湿极限温度随积分辐射剂量的增加而增加。辐照后，湿长度和接触时间增加，接触角减小。在淬火测试中，获得了由SUS制成的模拟燃料棒的高表面润湿性或高亲水性条件，并且在300 kGy Co-60γ射线辐照后，淬火速度提高了20-30％。 （C）2004 Elsevier Inc.保留所有权利。

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