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Single-phase heat transfer regimes in forced flow conditions under exponential heat inputs

机译:指数热输入下强制流动条件下的单相传热制度

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摘要

We present an experimental and theoretical investigation of single-phase heat transfer under exponential power inputs. We conduct forced flow experiments with water, covering a broad range of mass fluxes (from 0 to 19,300 kg/m~2/s), bulk temperatures (from 25 to 100 °C), pressures (from 0.1 to 1.2 MPa), exponential power escalation periods (from 2.5 to 200 ms), and considering two different heater and channel geometries. We use a high-speed infrared thermometry technique to measure the space- and time-dependent heat transfer coefficient between the heated surface and the coolant, building a database covering 73 different experimental conditions. We consider turbulence as a diffusive process and develop an analytic model that can predict 80% of our database within a ±10% error, and the entire database within a ±20% error. We discuss the presence of three heat transfer regimes, i.e., transient conduction, transient turbulent diffusion, and quasi-steady turbulent heat transfer, and derive analytically the two associated transition criteria. These transitions depend on the power escalation period, fluid properties, and are connected to the profile of the turbulent diffusion properties across the boundary layer.
机译:我们在指数功率输入下对单相热传递的实验和理论研究。我们用水进行强制流动实验,覆盖广泛的质量通量(从0至19,300 kg / m〜2 / s,大量温度(25至100°C),压力(0.1至1.2MPa),指数电源升级期(从2.5到200毫秒到200毫秒),并考虑两个不同的加热器和通道几何形状。我们使用高速红外测温技术来测量加热表面和冷却剂之间的空间和时间依赖的传热系数,建立覆盖73个不同的实验条件的数据库。我们认为湍流作为扩散过程,并开发一个分析模型,可以在±10%的错误中预测80%的数据库,以及在±20%错误中的整个数据库。我们讨论了三个传热制度的存在,即瞬态传导,瞬态湍流扩散和准稳态湍流传热,并分析两个相关的转换标准。这些过渡取决于电源升级周期,流体特性,并连接到边界层横跨边界层的湍流扩散特性的轮廓。

著录项

  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第8期|121294.1-121294.13|共13页
  • 作者单位

    Department of Nuclear Science and Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA;

    Department of Nuclear Science and Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA Universite Paris-Saclay CEA Service de thermo-hydraulique et de mecanique des fluides Cif-sur-Yvette 91191 France;

    Universite Paris-Saclay CEA Service de thermo-hydraulique et de mecanique des fluides Cif-sur-Yvette 91191 France;

    Department of Nuclear Science and Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA;

    Department of Nuclear Science and Engineering Massachusetts Institute of Technology Cambridge MA 02139 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

    Exponential power input; Forced convection; Single-phase heat transfer regimes; Transition criteria;

    机译:指数功率输入;强迫对流;单相传热制度;过渡标准;

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