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Experimental investigation of convection heat transfer of n-decane at supercritical pressures in small vertical tubes

机译:小型立管中超临界压力下正癸烷对流换热的实验研究

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摘要

This paper presents experimental investigations of the convection heat transfer of n-decane at supercritical pressures in vertical tubes with inner diameters of 0.95 and 2.00 mm for various inlet pressures, heat fluxes and flow directions. The effects of the heat fluxes, property variations, buoyancy and flow acceleration on the convection heat transfer were studied. The results show that for high inlet Reynolds numbers neither buoyancy nor flow acceleration affects heat transfer significantly, while for low inlet Reynolds numbers buoyancy strongly reduces heat transfer coefficient in upward flow cases. The threshold for Bo~* was found to be about 2.0 × 10~(-7). Two local Nusselt number correlations for the convection heat transfer of supercritical pressures n-decane with and without buoyancy effect were developed based on the experimental data.
机译:本文介绍了正癸烷在超临界压力下在不同入口压力,热通量和流动方向的内径为0.95和2.00 mm的垂直管中对流传热的实验研究。研究了热通量,性能变化,浮力和流动加速度对流换热的影响。结果表明,对于高入口雷诺数,浮力和流动加速度都不会显着影响传热,而对于低入口雷诺数,浮力在向上流动的情况下会大大降低传热系数。发现Bo〜*的阈值约为2.0×10〜(-7)。基于实验数据,建立了具有和不具有浮力作用的超临界压力正癸烷对流换热的两个局部Nusselt数相关性。

著录项

  • 来源
    《International Journal of Heat and Mass Transfer》 |2015年第12期|734-746|共13页
  • 作者单位

    Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Beijing Key Laboratory of CO_2 Utilization and Reduction Technology, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China ,Science and Technology on Space Physics Laboratory, Beijing 100076, China;

    Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Beijing Key Laboratory of CO_2 Utilization and Reduction Technology, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China;

    Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Beijing Key Laboratory of CO_2 Utilization and Reduction Technology, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China;

    National Key Laboratory of Science and Technology on Scramjet, Beijing 100074, China;

    National Key Laboratory of Science and Technology on Scramjet, Beijing 100074, China;

    Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Beijing Key Laboratory of CO_2 Utilization and Reduction Technology, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China;

  • 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

    Hydrocarbon fuel; Supercritical pressure; n-Decane; Convection heat transfer; Experiments;

    机译:碳氢燃料;超临界压力;正癸烷;对流换热;实验;

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