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首页> 外文期刊>International Journal of Heat and Mass Transfer >Investigation on convective heat transfer characteristics of single phase liquid flow in multi-port micro-channel tubes
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Investigation on convective heat transfer characteristics of single phase liquid flow in multi-port micro-channel tubes

机译：多端口微通道管内单相液体对流换热特性研究

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摘要

The friction and heat transfer characteristics of single phase liquid flow through two multi-port extruded (MPE) micro-tubes were investigated by experiments and theoretical analysis. The cross-section geometries of two tubes were rectangular (approximate square) and circular, and the hydraulic diameters were 0.715 and 0.86 mm respectively. The working fluid was ethanol and its Reynolds number was in the range of 50-2400. The inlet temperature changed from 5 to 45 ℃ and the heat flux ranged from 3 to 9 kW/m~2. The measurements of pressure drop were performed under isothermal and non-isothermal (constant heat flux) conditions. The effects of different boundary conditions on the simultaneous pressure drop and heat transfer characteristics were studied. The results showed that the Nusselt numbers decrease with the increase of inlet temperature and heat flux. Furthermore, the scaling effects of conjugate heat transfer, entrance effects and temperature dependent viscosity variation on the convective heat transfer are significant. Based on the experimental data, new correlations for the Nusselt numbers were obtained considering the scaling effects for the multi-port tubes.
机译：通过实验和理论分析研究了单相液体流过两个多端口挤压（MPE）微管的摩擦和传热特性。两个管的横截面几何形状为矩形（近似正方形）和圆形，水力直径分别为0.715和0.86 mm。工作流体是乙醇，并且其雷诺数在50-2400的范围内。入口温度从5到45℃变化，热通量从3到9 kW / m〜2。压降的测量是在等温和非等温（恒定热通量）条件下进行的。研究了不同边界条件对同时降压和传热特性的影响。结果表明，随着入口温度和热通量的增加，Nusselt数减小。此外，对流换热的共轭传热，入口效应和温度依赖性粘度变化的比例效应也很显着。基于实验数据，考虑到多端口管的缩放效应，获得了Nusselt数的新相关性。

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  • 作者

    Baomin Dai; Minxia Li; Chaobin Dang; Yitai Ma; Qi Chen;

  • 作者单位

    Key Laboratory of Efficient Utilization of Low and Medium Grade Energy, MOE, Tianjin University, 92 Weijin Road, Nankai District, Tianjin 300072, China;

    Key Laboratory of Efficient Utilization of Low and Medium Grade Energy, MOE, Tianjin University, 92 Weijin Road, Nankai District, Tianjin 300072, China;

    Department of Human and Engineered Environmental Studies, Graduate School of Frontier Sciences, The University of Tokyo, Kashiwanoha 5-1-5, Kashiwa-Shi, Chiba 277-8563, Japan;

    Key Laboratory of Efficient Utilization of Low and Medium Grade Energy, MOE, Tianjin University, 92 Weijin Road, Nankai District, Tianjin 300072, China;

    Tianjin Sanden Auto Air-Conditioning Co., LTD, No. 8 XEDA No. 2 Avenue, Xiqing Economic Development Area, Tianjin 300385, 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

    Multi-port micro-channels; Fraction factor; Convective heat transfer; Different boundary conditions; Scaling effects;

    机译：多端口微通道;分数因子;对流换热;不同的边界条件;缩放效果;

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