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Experimental Investigation of Convection Heat Transfer in High Pressure and High Temperature Gas Flows

机译：高压高温气流中对流换热的实验研究

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摘要

This work focuses on an experimental investigation of convection heat transfer to a gas in a vertical tube under strongly heated conditions at high temperatures and pressures up to 943 K and 65 bar. A unique test facility for convection heat transfer experiments has been constructed, and used to obtain experimental data useful for better understanding and validation of numerical simulation models. This test facility consists of a single flow channel in a 2.7 m long, 0.11 m diameter graphite column with four 2.3 kW heaters placed symmetrically around the 16.8mm diameter flow channel. Upward flow convection experiments with air and nitrogen were conducted for inlet Reynolds numbers from 1300 to 60,000, thus covering laminar, transition, and fully turbulent flow regimes. Experiments were performed at different flow rates (3.8 × 10~(-4) to 1.5 × 10~(-2) kg/s) and heater power up to 6 kW. Importantly, the data analysis considered the thermophysical properties of the gas and graphite changing with temperature and pressure. Nusselt number results are further compared to existing correlations. The effect of pressure and heater power on degraded heat transfer is examined. The analyses of the experimental data showed significant reductions in Reynolds number of up to 50% and Nusselt numbers of up to 90% between the gas inlet and outlet.
机译：这项工作的重点是在高温和高达943 K和65 bar的强烈加热条件下，对流传热到垂直管中气体的实验研究。已经构建了用于对流传热实验的独特测试设备，并用于获取有助于更好地理解和验证数值模拟模型的实验数据。该测试设备包括一个长2.7 m，直径0.11 m的石墨柱中的单个流道，以及四个围绕直径16.8mm的流道对称放置的2.3 kW加热器。进行了空气和氮气的向上流动对流实验，其雷诺数为1300至60,000，从而涵盖了层流，过渡和完全湍流的流动状态。实验在不同的流速（3.8×10〜（-4）至1.5×10〜（-2）kg / s）下进行，加热器功率高达6 kW。重要的是，数据分析考虑了气体和石墨的热物理性质随温度和压力的变化而变化。将Nusselt数结果与现有相关性进行进一步比较。检查了压力和加热器功率对传热性能的影响。对实验数据的分析表明，在进气口和出气口之间，雷诺数显着减少了50％，努塞尔特数减少了90％。

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  • 来源
    《Journal of Heat Transfer》 |2017年第9期|091704.1-091704.12|共12页
  • 作者

    Francisco I. Valentin; Ryan Anderson; Masahiro Kawaji;

  • 作者单位

    Department of Mechanical Engineering, City College of New York, New York, NY 10031;

    Department of Chemical and Biological Engineering, Montana State University, Bozeman, MT 59717;

    Department of Mechanical Engineering, City College of New York, Energy Institute, New York, NY 10031;

  • 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
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