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首页> 外文期刊>International Journal of Heat and Fluid Flow >Accurate heat transfer measurements using thermochromic liquid crystal. Part 2: Application to a rotating disc
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Accurate heat transfer measurements using thermochromic liquid crystal. Part 2: Application to a rotating disc

机译：使用热致变色液晶进行准确的传热测量。第2部分：应用于旋转盘

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摘要

Encapsulated thermochromic liquid crystal (TLC) can accurately measure surface temperature in a variety of heat transfer and fluid-flow experiments. In Part 1 of this two-part paper, two narrow-band liquid crystals were specifically calibrated for application to experiments on a disc rotating at high speed (～5000 rpm). Part 2 describes how these crystals were used to measure the surface temperature on the disc in a transient experiment that models the flow of internal cooling air in a gas turbine. The TLC was viewed through the transparent polycarbonate disc using a digital video camera and strobe light synchronised to the disc frequency. The convective heat transfer coefficient, h, was subsequently calculated from the one-dimensional solution of Fourier's conduction equation for a semi-infinite wall. The analysis accounted for the exponential rise in the air temperature driving the heat transfer, and for experimental uncertainties in the measured values of h. The paper focuses on the method used, and sample experimental results are provided to demonstrate the accuracy and potency of the technique.
机译：封装的热致变色液晶（TLC）可以在各种传热和流体流动实验中准确测量表面温度。在这个由两部分组成的论文的第1部分中，对两种窄带液晶进行了专门校准，以应用于在高速（〜5000 rpm）旋转的光盘上进行的实验。第2部分描述了如何在瞬态实验中使用这些晶体来测量圆盘上的表面温度，该瞬变实验模拟了燃气轮机内部冷却空气的流动。通过使用数字摄像机的透明聚碳酸酯光盘和与光盘频率同步的频闪灯查看TLC。随后，从半无限壁的傅立叶传导方程的一维解中计算出对流传热系数h。该分析说明了驱动传热的气温呈指数增长，并且h的测量值存在实验不确定性。本文着重于所使用的方法，并提供了示例实验结果以证明该技术的准确性和有效性。

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  • 来源
    《International Journal of Heat and Fluid Flow》 |2009年第5期|950-959|共10页
  • 作者

    V.U. Kakade; G.D. Lock; M. Wilson; J.M. Owen; J.E. Mayhew;

  • 作者单位

    Department of Mechanical Engineering, University of Bath, Bath, BA2 7AY, England, United Kingdom;

    Department of Mechanical Engineering, University of Bath, Bath, BA2 7AY, England, United Kingdom;

    Department of Mechanical Engineering, University of Bath, Bath, BA2 7AY, England, United Kingdom;

    Department of Mechanical Engineering, University of Bath, Bath, BA2 7AY, England, United Kingdom;

    Department of Mechanical Engineering, University of Bath, Bath, BA2 7AY, England, United Kingdom Rose-Hulman Institute of Technology, IN, USA;

  • 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

    transient heat transfer; thermochromic liquid crystal; rotating flow;

    机译：瞬态传热热致变色液晶;旋转流;

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