...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International Journal of Heat and Mass Transfer >Oxidation effect on pool boiling critical heat flux enhancement of Cr-coated surface for accident-tolerant fuel cladding application
【24h】

Oxidation effect on pool boiling critical heat flux enhancement of Cr-coated surface for accident-tolerant fuel cladding application

机译：耐事故性燃料熔覆应用中氧化对Cr涂层表面熔池沸腾临界热通量增强的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The oxidation of an accident-tolerant fuel (ATF) cladding alters the surface roughness, which, in turn, affects the capillary wicking characteristics and critical heat flux (CHF) during the boiling process. To evaluate the effect of oxidation on the boiling performance of ATF coating, this study fabricated Cr-coated surfaces by varying the substrate temperature, resulting in various sizes of deposited particulate nanostructures by using a direct-current magnetron sputtering technique. To consider the oxidation effect, sputtered test specimens were oxidized at 400 degrees C dry air for 20 days, forming a Cr2O3 oxide layer with a thickness of approximately 0.1 mu m. Pool boiling CHF experiments were conducted in deionized water under atmospheric pressure. The resultant CHF on the fresh and oxidized Cr-coated surfaces was enhanced by up to 36% and 48%, respectively. A higher CHF enhancement was achieved with a lower substrate temperature during sputtering, which resulted in a higher nanoscale surface roughness. The spreading velocities on each specimen were measured through the characterization experiments of liquid droplet spreading, which can be interpreted as the capillary wicking momentum. The pool boiling CHF was predicted with spreading velocity and roughness parameters. The predicted CHF showed a good agreement with the measured CHF. This study suggests that the oxidation of Cr-coated ATF specimens has a positive effect on the enhanced CHF, which can be confirmed through the altered surface roughness and capillary wicking momentum. (C) 2019 Elsevier Ltd. All rights reserved.
机译：容错燃料（ATF）包层的氧化会改变表面粗糙度，进而在沸腾过程中影响毛细管芯吸特性和临界热通量（CHF）。为了评估氧化对ATF涂层沸腾性能的影响，本研究通过改变基板温度来制造Cr涂层表面，并使用直流磁控溅射技术形成了各种尺寸的沉积颗粒纳米结构。为了考虑氧化作用，将溅射的试样在400℃的干燥空气中氧化20天，形成厚度约为0.1μm的Cr 2 O 3氧化物层。在大气压下在去离子水中进行池沸腾CHF实验。在新鲜和氧化的Cr涂层表面上生成的CHF分别提高了36％和48％。在溅射过程中以较低的基板温度实现了更高的CHF增强，从而导致了更高的纳米级表面粗糙度。通过液滴散布的表征实验测量了每个样品上的散布速度，这可以解释为毛细管芯吸动量。用铺展速度和粗糙度参数预测池沸腾CHF。预测的CHF与测得的CHF显示出良好的一致性。这项研究表明，镀铬的ATF试样的氧化对增强的CHF具有积极作用，这可以通过改变表面粗糙度和毛细管芯吸动量来证实。 （C）2019 Elsevier Ltd.保留所有权利。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号