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Two-phase flow behaviour and pressure drop of R134a in a smooth hairpin

机译:R134a在光滑发夹中的两相流动行为和压降

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摘要

Adiabatic two-phase flow of refrigerant R-134a in a hairpin was studied. The hairpin consists of a smooth tube with an inner diameter of 8 mm and with a bend radius of 11 mm. Because of the forces exerted on the flow in the bend, the flow needs to redevelop downstream of the U-bend. The effects of this phenomenon on the pressure drop are studied and linked to visual observations of the flow. Pressure drop and videos of the flow behaviour are recorded in the straight sections upstream and downstream of the bend. These are then compared to the flow and pressure drop for developed flow. The pressure drop downstream of the bend was consistently higher than that for developed flow. It exceeded the pressure drop for developed flow by an average of 30% for all data points. Each video of the flow behaviour was reduced to a single image by calculating the standard deviation of the time signal of each pixel. The standard deviation profiles were compared in order to quantitatively evaluate the change of the flow behaviour. The flow recovery downstream of the bend stretches out over more than 30 tube diameters.
机译:研究了发夹中制冷剂R-134a的绝热两相流。发夹由内径8毫米,弯曲半径11毫米的光滑管组成。由于作用在弯头上的流上的力,流需要在U型弯管的下游重新发展。研究了这种现象对压降的影响,并将其与流动的视觉观察联系起来。在弯头上游和下游的直线段中记录压降和流动行为视频。然后将这些与流量和压降进行比较以形成流量。弯头下游的压降始终高于发达流量。对于所有数据点,它平均超过已开发流量的压降30%。通过计算每个像素的时间信号的标准偏差,将每个流动行为的视频简化为单个图像。比较标准偏差曲线,以便定量评估流动行为的变化。弯头下游的流量恢复延伸超过30个管径。

著录项

  • 来源
    《International Journal of Heat and Mass Transfer》 |2012年第4期|p.1179-1188|共10页
  • 作者单位

    Department of Bow, Heat and Combustion Mechanics, Ghent University, Sint-Pietersnieuwstraat 41. 9000 Cent, Belgium;

    Department of Bow, Heat and Combustion Mechanics, Ghent University, Sint-Pietersnieuwstraat 41. 9000 Cent, Belgium;

    Department of Bow, Heat and Combustion Mechanics, Ghent University, Sint-Pietersnieuwstraat 41. 9000 Cent, Belgium;

    Department of Bow, Heat and Combustion Mechanics, Ghent University, Sint-Pietersnieuwstraat 41. 9000 Cent, Belgium,Delft University of Technology, Department Radiation, Radionuclides & Reactors, Mekelweg 15, 2629 JB Delft, The Netherlands;

    Department of Bow, Heat and Combustion Mechanics, Ghent University, Sint-Pietersnieuwstraat 41. 9000 Cent, Belgium;

    Department of Bow, Heat and Combustion Mechanics, Ghent University, Sint-Pietersnieuwstraat 41. 9000 Cent, Belgium;

  • 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

    two-phase flow; pressure drop; hairpin; flow visualisation;

    机译:两相流压降发夹流动可视化;

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