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首页> 外文期刊>International Journal of Heat and Mass Transfer >Effect of straight micro fins on heat transfer and pressure drop of R410A during evaporation in round tubes
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Effect of straight micro fins on heat transfer and pressure drop of R410A during evaporation in round tubes

机译：直微翅片对圆管蒸发过程中R410A的传热和压降的影响

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摘要

The objective of this paper is to present the influence of straight micro-fins on heat transfer coefficient and pressure drop. R410A flow boiling experiments were conducted in both smooth tube and the axial micro-finned tube. Data are taken at 10℃ saturation temperature for the vapor quality from 0.1 to 0.9, mass flux from 100 to 450 kg/s-m2, and heat flux from 10 to 20 kW/m2. The results in the smooth tube were compared with several correlations and used as a baseline. It was observed that straight micro-fin structure played an important role in the evaporative heat transfer. The heat transfer coefficient was significantly enhanced in the axial micro-finned tube, whose enhancement factor ranged from 1.03 to 1.48 with average of 1.34. As the mass flux and vapor quality was low, the straight micro-fins had stronger influence of the heat transfer coefficient since the liquid-phase refrigerant was easily trapped in the grooves of the axial micro-finned tube. The pressure drop penalty factor of the axial micro-finned tube ranged from 0.66 to 1.6, and the average was around 1.23.
机译：本文的目的是提出直的微翅片对传热系数和压降的影响。 R410A流动沸腾实验在光滑管和轴向微翅片管中进行。数据是在10℃饱和温度下获得的，其蒸汽质量为0.1至0.9，质量通量为100至450 kg / s-m2，热通量为10至20 kW / m2。将光滑管中的结果与几种相关性进行比较，并将其用作基线。观察到直的微翅片结构在蒸发传热中起重要作用。轴向微翅片管的传热系数显着提高，其提高系数在1.03至1.48之间，平均值为1.34。由于质量通量和蒸汽质量低，直的微翅片对传热系数的影响更大，因为液相制冷剂很容易滞留在轴向微翅片管的凹槽中。轴向微翅片管的压降损失因子在0.66至1.6的范围内，平均值约为1.23。

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  • 来源
  • 作者

    Cheng-Min Yang; Pega Hrnjak;

  • 作者单位

    Air Conditioning and Refrigeration Center, Department of Mechanical Engineering and Science, University of Illinois at Urbana-Champaign, 1206 W Green St, Urbana, IL, USA;

    Air Conditioning and Refrigeration Center, Department of Mechanical Engineering and Science, University of Illinois at Urbana-Champaign, 1206 W Green St, Urbana, IL, USA,CTS-Creative Thermal Solutions, 2209 Willow Rd, Urbana, IL, USA;

  • 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

    Axial micro-finned tube; Straight micro fin; Evaporation; R410A; HTC; Pressure drop;

    机译：轴向微翅片管;直微鳍;蒸发;R410A;HTC;压力下降;

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