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首页> 外文期刊>Heat Transfer Engineering >Boiling Enhancement on Nanostructured Surfaces with Engineered Variations in Wettability and Thermal Conductivity
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Boiling Enhancement on Nanostructured Surfaces with Engineered Variations in Wettability and Thermal Conductivity

机译：工程性在润湿性和导热性方面有所变化的纳米结构表面的沸腾增强

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摘要

This work provides fundamental insights into the underlying mechanisms of pool boiling enhancement using a variety of different engineered surface designs. Specifically, the effects of nanostructured coatings, surfaces with mixed wettability, and surfaces with in-plane variations in thermal conductivity are investigated. The positive and negative impacts of each design on the onset of nucleate boiling, heat transfer coefficient, bubble dynamics and the ebullition cycle, as well as critical heat flux have been characterized. It is seen that while several techniques enhance one element of the boiling process, they can degrade others. This analysis has led to the design, fabrication, and characterization of complex heterogeneous surfaces by combining multiple engineered surface techniques. Nanostructured surfaces with variations in substrate thermal conductivity have been shown to increase critical heat flux by a factor of 2.6× as compared to bare copper substrates. In addition, nanostructured surfaces with engineered variations in substrate conductivity as well as surface wettability have been shown to increase heat transfer coefficient by more than a factor of 10×.
机译：这项工作为使用各种不同的工程表面设计提高池沸腾的潜在机制提供了基本见识。具体而言，研究了纳米结构涂层，具有混合润湿性的表面以及热导率具有面内变化的表面的影响。每种设计对成核沸腾，传热系数，气泡动力学和沸腾循环以及临界热通量的正面和负面影响均已被表征。可以看出，尽管有几种技术增强了沸腾过程的一个要素，但它们却可以使其他要素退化。通过结合多种工程表面技术，这种分析导致了复杂异质表面的设计，制造和表征。与裸铜基板相比，具有基板导热系数变化的纳米结构表面已显示出将临界热通量提高了2.6倍。此外，具有基体电导率和表面润湿性的工程变化的纳米结构表面已显示出将传热系数提高了10倍以上。

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  • 来源
    《Heat Transfer Engineering》 |2017年第15期|1285-1295|共11页
  • 作者

    Md Mahamudur Rahman; Matthew McCarthy;

  • 作者单位

    Department of Mechanical Engineering and Mechanics, Drexel University, Philadelphia, PA, USA;

    Department of Mechanical Engineering and Mechanics, Drexel University, Philadelphia, PA, USA;

  • 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
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