首页> 外文期刊>International Journal of Heat and Mass Transfer >Laminar forced convection effectiveness of Al_2O_3-water nanofluid flow in a circular tube at various operation temperatures: Effects of temperature-dependent properties
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Laminar forced convection effectiveness of Al_2O_3-water nanofluid flow in a circular tube at various operation temperatures: Effects of temperature-dependent properties

机译:不同工作温度下圆管中Al_2O_3-水纳米流体的层流强迫对流效率:温度相关特性的影响

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摘要

In this paper, effects of temperature-dependent thermophysical properties on laminar forced convection effectiveness of Al_2O_3-water nanofluids in a circular tube imposed to a constant heat flux are investigated numerically. The numerical study is supplemented with a scale analysis based on the integral energy equation. The analysis is conducted for various inlet temperatures and considering two cases for properties including (ⅰ) constant-properties, and (ⅱ) temperature-dependent properties. The simulated results are presented for three different concentrations of nanofluids i.e. 0%, 5%, and 9%, volume flow rates in the range of 24-180 cm~3/min which correspond with Reynolds numbers between 120 and 2000, heat fluxes between 5.51 × 10~2 and 1.23 × 10~4 W/m~2, and various inlet temperatures in the range of 25-50 ℃. The effects of various inlet temperatures of nanofluids and different thermophysical models on the local and average Nusselt numbers in the tube have been investigated in details. It is found that with an increase in both nanofluid concentration and temperature rise in the heated section, the effects of inlet temperature and thermophysical properties on the Nusselt number are more pronounced.
机译:数值研究了温度依赖的热物理性质对施加恒定热通量的圆管中Al_2O_3-水纳米流体层流强迫对流效率的影响。数值研究辅以基于积分能量方程的尺度分析。针对各种入口温度进行分析,并考虑两种情况下的特性,包括(ⅰ)恒定特性和(ⅱ)温度相关特性。给出了三种不同浓度的纳米流体的模拟结果,即0%,5%和9%,体积流量在24-180 cm〜3 / min范围内,分别对应于120到2000之间的雷诺数, 5.51×10〜2和1.23×10〜4 W / m〜2,并且各种入口温度在25-50℃范围内。已经详细研究了纳米流体的各种入口温度和不同的热物理模型对管中局部和平均Nusselt数的影响。发现随着纳米流体浓度的增加和加热部分的温度升高,入口温度和热物理性质对Nusselt值的影响更加明显。

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  • 作者单位

    Department of Mechanical Engineering, National Cheng Kung University, Tainan 70101, Taiwan;

    Department of Mechanical Engineering, National Cheng Kung University, Tainan 70101, Taiwan;

    Department of Mechanical Engineering, National Cheng Kung University, Tainan 70101, Taiwan;

    Department of Mechanical Engineering, National Cheng Kung University, Tainan 70101, Taiwan;

    Department of Mechanical Engineering, National Cheng Kung University, Tainan 70101, Taiwan;

    Department of Mechanical Engineering, National Cheng Kung University, Tainan 70101, Taiwan;

    Department of Energy and Refrigerating Mr-Conditioning Engineering, National Taipei University of Technology, Taipei 10608, Taiwan;

  • 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

    Nanofluids; Temperature-dependent properties; Circular tube; Forced convection effectiveness;

    机译:纳米流体;温度相关的特性;圆管;强制对流效果;

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