• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Heat Transfer Engineering >Effect of Flow Instability on Pool Boiling and CHF of Thin Flat Plate Heater PCB
【24h】

Effect of Flow Instability on Pool Boiling and CHF of Thin Flat Plate Heater PCB

机译：流动不稳定性对薄板加热器PCB池沸腾和CHF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 effect of the heater geometry on the critical heat flux (CHF) in the saturated pool boiling condition was studied here using the vertically upward-facing thin flat plate heater mounted on a printed circuit board (PCB). The heater width was scaled by the characteristic width as the ratio of the width to the Laplace length, and the CHF data were correlated with the characteristic width. It was found that for the large characteristic width the present CHF data were almost independent of the heater width like the infinite flat plate heater. As the characteristic width of heater decreases, a large enhancement of CHF was observed. The CHF data measured were following the prediction of Lienhard and Dhir model with the exponent of-1/4 for the characteristic width. However, it was found that a lower limit exists in the application of the Lienhard and Dhir model. For the narrow heater with a characteristic width less than 0.25, larger enhancement of CHF was observed. We developed a new CHF correlation to explain this exceptionally large enhancement of CHF based on the existing Lienhard and Dhir model extending to a narrower region by introducing the wavelength as a function of the heater characteristic width. We determined this function experimentally from the wavelength measure from the air-water slit with the same width and length of the heater geometry and the distance of the bubble departure spots on the real heater surface. The present new model successfully estimated the CHF data observed with the exponent of-3/8 rather than that of-1/4 of Lienhard and Dhir. The present study partially explains the reason for the CHF enhancement of the heater with the specific micro- or nanostructure.
机译：在这里，使用安装在印刷电路板（PCB）上的垂直朝上的薄平板加热器研究了加热器几何形状对饱和池沸腾条件下的临界热通量（CHF）的影响。加热器宽度按特征宽度与拉普拉斯长度的比值进行缩放，并且CHF数据与特征宽度相关。已经发现，对于较大的特征宽度，当前的CHF数据几乎与加热器宽度无关，就像无限平板加热器一样。随着加热器的特征宽度减小，观察到了CHF的大幅提高。测量的CHF数据遵循Lienhard和Dhir模型的预测，特征宽度的指数为-1/4。然而，发现在Lienhard和Dhir模型的应用中存在下限。对于特征宽度小于0.25的窄加热器，观察到CHF更大的增强。我们通过引入波长作为加热器特征宽度的函数，基于现有的Lienhard和Dhir模型，开发了一种新的CHF相关性，以解释CHF的这种异常大的增强。我们根据空气几何形状的宽度和长度与加热器几何形状相同的宽度和长度以及实际加热器表面上气泡离开点的距离，从空气-水缝的波长测量值中，通过实验确定了该功能。本新模型成功地估计了观察到的CHF数据，其Lienhard和Dhir指数为-3/8，而不是-1/4。本研究部分解释了具有特定微结构或纳米结构的加热器的CHF增强的原因。

著录项

  • 来源
    《Heat Transfer Engineering》 |2015年第11期|1028-1036|共9页
  • 作者

    WOO-RAM LEE; JAE-YOUNG LEE;

  • 作者单位

    Department of Advanced Green Energy and Environment, Handong Global University, BUK-KU, Pohang, Kyeongbuk, Korea 791-708;

    Department of Advanced Green Energy and Environment, Handong Global University, Pohang, Korea;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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