• 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 >In-situ thermal transport measurement of flowing fluid using modulated photothermal radiometry
【24h】

In-situ thermal transport measurement of flowing fluid using modulated photothermal radiometry

机译：使用调制光热辐射测量的流动流体的原位热传输测量

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

In situ thermal transport measurement of flowing fluid could be useful for the characterization and diagnosis of practical thermal systems such as fluid heat exchangers and thermal energy storage systems. Despite abundant reports on the ex-situ thermal conductivity measurement of stagnant fluids, a suitable technique for the thermal conductivity measurement of flowing fluid has been rarely reported. This paper presents the thermal conductivity measurement of flowing fluid within a pipe using a non-contact modulated photothermal radiometry (MPR) technique, where the surface of the pipe is heated by an intensity-modulated laser and the heat diffuses into the fluid with suitable modulation frequency. We design a tube section with small wall thickness suitable for the MPR measurements to maximize the sensitivity of the thermal response to the fluid properties while minimizing the lateral heat spreading effect. Intrinsic thermal conductivity of different fluids was obtained within a proper range of frequency and flow velocity where the forced convection effect is negligible. The forced convection effect became prominent at high flowing velocity and at low modulation frequency, leading to higher effective thermal conductivity of the fluid. It is found that the intrinsic thermal conductivity could be obtained when the flow velocity is less than 100 mm/sec and Re_D~(1/2)Pr~(1/3) < 100 for DI water and Xceltherm oil under the specified experimental conditions, where Re_D is the Reynolds number and Pr is the Prandtl number.
机译：原位热传输流动流体的测量可用于表征和诊断实用的热系统，例如流体热交换器和热能储能系统。尽管对储存流体的前原位导热率测量有丰富的报告，但很少报道具有流动流体的热导率测量的合适技术。本文介绍了使用非接触调制的光热辐射术（MPR）技术的管道内流体流体的导热率测量，其中管的表面被强度调制的激光加热，并且热扩散到具有合适调制的流体中频率。我们设计具有小壁厚的管部分，适用于MPR测量，以最大化热响应对流体性质的灵敏度，同时最小化横向散热效果。在适当的频率和流速范围内获得不同流体的固有导热率，其中强制对流效应可以忽略不计。强制对流效果在高流动速度和低调制频率下变得突出，导致流体的有效导热率较高。结果发现，当在指定的实验条件下，当流速小于100mm / sec和DI水和Xceltherm油的Re_d〜（1/2）Pr〜（1/3）<100时，可以获得固有的导热率，其中re_d是reynolds编号，pr是prandtl号码。

著录项

  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第12期|121767.1-121767.10|共10页
  • 作者

    Jian Zeng; Ka Man Chung; Sarath Reddy Adapa; Tianshi Feng; Renkun Chen;

  • 作者单位

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

    Program of Material Science and Engineering 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 Mechanical and Aerospace Engineering 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 Program of Material Science and Engineering 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; Thermal conductivity; Flowing fluid; In-situ Measurement; Convection heat transfer;

    机译：光热辐射测定;导热系数;流动的液体;原位测量;对流热转印;

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