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首页> 外文期刊>International Journal of Heat and Mass Transfer >Measurement of High-temperature Thermophysical Properties of Bulk and Coatings Using Modulated Photothermal Radiometry
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Measurement of High-temperature Thermophysical Properties of Bulk and Coatings Using Modulated Photothermal Radiometry

机译：用调制的光热辐射测量测量散装和涂层的高温热物理性质

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摘要

This paper presents the development of instrumentation for the measurement of high-temperature thermal conductivity of bulk and coatings using a modulated photothermal radiometry (MPR) method, where a sample is heated by an intensity-modulated laser to probe into different layers of the sample. While MPR has been previously established, most of the prior studies only focus on the measurement at room temperature. The MPR has not been well studied for measurements of bulk and coating materials at high temperatures, which are increasingly important for a multitude of applications, such as materials used in the concentrating solar power (CSP) plants and the nuclear reactors. MPR is a non-contact technique that utilizes the intrinsic thermal emission from the specimens for thermometry, which is favorable for measurements at high temperatures in harsh environment. The authors designed and utilized a sample holder suitable for high temperature measurement up to 973 K with good temperature uniformity within the sample. The high-temperature MPR setup was validated by measuring bulk materials with known thermal conductivity. The setup and technique were then extended to the measurement of black solar-absorbing coatings of 10 to 50μm thick on various substrates by modulating the frequency of the laser heating beam and the thermal penetration depth. The studies showed that thermal conductivities of typical solar-absorbing coatings are 0.4 - 0.8 Wm~(-1) K~(-1) indicating a possibly large temperature drop within the coating under high solar irradiation flux, such as over 1000-sun for central solar towers in CSP plants.
机译：本文介绍了使用调制的光热辐射（MPR）方法测量块状和涂层的高温导热率的仪器的开发，其中通过强度调制的激光加热样品以探测到样品的不同层。虽然MPR先前已经建立，但大多数先前的研究只关注在室温下的测量。 MPR尚未得到很好的研究，用于在高温下测量散装和涂层材料，这对于多种应用越来越重要，例如集中太阳能（CSP）植物和核反应堆中使用的材料。 MPR是一种非接触技术，其利用来自试样的固有热发射进行温度测量，这有利于在恶劣环境中的高温下测量。作者设计和利用了适用于高温测量的样品夹持器，高达973 k，在样品中具有良好的温度均匀性。通过用已知的导热率测量散装材料来验证高温MPR设置。然后，通过调制激光加热梁的频率和热穿透深度，将设置和技术延伸到在各种基板上的10至50μm厚的黑色太阳能吸收涂层的测量。这些研究表明，典型的太阳能吸收涂层的热导体是0.4-0.8Wm〜（-1）K〜（-1），表明在高太阳照射通量下涂层内可能大的温度下降，例如超过1000℃ CSP植物中的中央太阳能塔。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第5期|120989.1-120989.11|共11页
  • 作者

    Jian Zeng; Ka Man Chung; Qingyang Wang; Xiaoxin Wang; Yu Pei; Peiwen Li; Renkun Chen;

  • 作者单位

    Department of Mechanical and Aerospace Engineering University of California San Diego La Jolla California 92093 United States;

    Material Science and Engineering Program University of California San Diego La Jolla California 92093 United States;

    Department of Mechanical and Aerospace Engineering University of California San Diego La Jolla California 92093 United States;

    Department of Aerospace and Mechanical Engineering The University of Arizona Tucson Arizona 85721 United States;

    Department of Mechanical and Aerospace Engineering University of California San Diego La Jolla California 92093 United States;

    Department of Aerospace and Mechanical Engineering The University of Arizona Tucson Arizona 85721 United States;

    Department of Mechanical and Aerospace Engineering University of California San Diego La Jolla California 92093 United States Material Science and Engineering Program University of California San Diego La Jolla California 92093 United States;

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

    Photothermal Radiometry; High Temperature; Concentrating Solar Power; Coating; Thermal Conductivity;

    机译：光热辐射测定;高温;集中太阳能;涂层;导热系数;

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