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Experimental Study of Heat Transfer Enhancement for Fluid Flow Inside Annulus with Spiral Wires

机译：螺旋线增强环空内流体流动的传热实验研究

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摘要

The evaluation of heat transfer and pressure drop in a water flow inside an annulus of a double concentric-tube heat exchanger with spiral wires inserts was carried out. Three spiral wires with a constant pitch and different wire diameter were tested for a Reynolds number from 1500 to 5500 and a Prandtl number from 5 to 8. The results obtained showed that the spiral wires increased the heat transfer and the pressure drop in comparison with a fluid flow inside a smooth annulus. From the heat transfer point of view, this increase was proportional to the wire diameter but the effect decreases when the Reynolds number increases. General empirical correlations based on dimensionless parameters to calculate the convective heat transfer coefficient and friction factor were developed with an uncertainty of ±6.1% and ±7.6%, respectively, when these estimates were compared against experimental data. The empirical correlations developed were also compared with the estimates calculated by empirical correlations proposed by other researchers, resulting in a good agreement with these values. After the validation analysis, it was demonstrated that the new equations developed provide a good and reliable tool for the design of double concentric-tube heat exchangers with spiral wires inserted inside annulus.
机译：对带有螺旋金属丝插入件的双同心管式换热器的环形空间内的水流中的传热和压降进行了评估。测试了三种螺距恒定且线径不同的螺旋线，雷诺数为1500至5500，普朗特数为5至8。获得的结果表明，螺旋线与传热管相比增加了传热和压降。流体在光滑的环空中流动。从传热的角度来看，这种增加与焊丝直径成正比，但是当雷诺数增加时，影响减小。当将这些估计值与实验数据进行比较时，基于无量纲参数计算对流传热系数和摩擦因数的一般经验相关性的不确定度分别为±6.1％和±7.6％。还将开发的经验相关性与其他研究人员提出的经验相关性计算出的估计值进行了比较，从而与这些值具有很好的一致性。经过验证分析后，可以证明开发出的新方程式为设计将双螺旋管插入环形空间的双同心管热交换器提供了一个良好而可靠的工具。

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  • 来源
    《Heat Transfer Engineering》 |2018年第4期|15-26|共12页
  • 作者

    Josue Imbert Gonzalez; Octavio Garcia Valladares; Reinaldo Guillen Gordin;

  • 作者单位

    Facultad de Ingenieria Mecanica e Industrial, Universidad de Oriente, Santiago de Cuba, Cuba;

    lnstituto de Energias Renovables, UNAM, Morelos, Mexico;

    Facultad de Ingenieria Mecanica e Industrial, Universidad de Oriente, Santiago de Cuba, Cuba;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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