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首页> 外文期刊>Journal of Heat Transfer >Convection Calibration of Schmidt-Boelter Heat Flux Gauges in Stagnation and Shear Air Flow
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Convection Calibration of Schmidt-Boelter Heat Flux Gauges in Stagnation and Shear Air Flow

机译：Schmidt-Boelter热通量规在停滞和剪切气流中的对流校准

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摘要

Experiments were performed to characterize the performance of Schmidt-Boelter heat flux gauges in stagnation and shear convective air flows. The gauges were of a standard design (25.4 mm and 38 mm in diameter), using a copper heat sink with water cooling channels around the active sensing element. A simple model of the gauges using an internal thermal resistance between the sensor surface and the heat sink is used to interpret the results. The model predicts a nonlinear dependence of the gauge sensitivity as a function of the heat transfer coefficient. Experimental calibration systems were developed to simultaneously measure the heat flux gauge response relative to a secondary standard under the same flow and thermal conditions. The measured gauge sensitivities in the stagnation flow matched the model, and were used to estimate the value of the internal thermal resistance for each of the four gauges tested. For shear flow, the effect of the varying gauge surface temperature on the boundary layer was included. The results matched the model with a constant factor of 15-25% lower effective heat transfer coefficient. When the gauge was water cooled, the effect of the internal thermal resistance of the gauge was markedly different for the two flow conditions. In the stagnation flow, the internal resistance further decreased the apparent gauge sensitivity. Conversely, in shear flow, the resistance was effectively offset by the cooler heat sink of the gauge, and the resulting sensitivities were nearly the same as, or larger than, for radiation.
机译：进行了实验以表征Schmidt-Boelter热通量计在停滞和剪切对流气流中的性能。压力计为标准设计（直径25.4毫米和38毫米），使用铜散热片，有源感应元件周围有水冷通道。使用在传感器表面和散热器之间的内部热阻的压力计的简单模型来解释结果。该模型预测仪表灵敏度与传热系数之间的非线性相关性。开发了实验校准系统，以在相同的流量和热条件下同时测量相对于次要标准的热通量计响应。停滞流中测得的仪表灵敏度与模型匹配，并用于估算四个测试仪表中每个仪表的内部热阻值。对于剪切流，计入了变化的表层温度对边界层的影响。结果与模型匹配，有效传热系数降低了15-25％。当仪表用水冷却时，仪表的内部热阻对两种流量条件的影响明显不同。在停滞流动中，内阻进一步降低了表观表观灵敏度。相反，在剪切流中，阻力被仪表的较冷散热器有效地抵消，并且所产生的灵敏度几乎与辐射相同或更大。

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  • 来源
    《Journal of Heat Transfer》 |2010年第3期|031601.1-031601.9|共9页
  • 作者

    A. Gifford; A. Hoffie; T. Diller; S. Huxtable;

  • 作者单位

    Department of Mechanical Engineering, Virginia Tech, Blacksburg, VA24061;

    Department of Mechanical Engineering, Virginia Tech, Blacksburg, VA24061;

    Department of Mechanical Engineering, Virginia Tech, Blacksburg, VA24061;

    Department of Mechanical Engineering, Virginia Tech, Blacksburg, VA24061;

  • 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

    heat flux gauge; sensor calibration; convection effects;

    机译：热通量表传感器校准对流效应;

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