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Experimental Evaluation of the Conjugate Cooling of a Protruding Heater in a Duct

机译：管道内突出加热器共轭冷却的实验评估

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摘要

Experiments were performed to investigate the conjugate forced convection-conduction cooling of a protruding heater mounted on the lower wall (substrate plate) of a rectangular duct. The heater was an aluminum rectangular block heated by means of electric power dissipation in an embedded resistance. Airflow was forced in the duct with a hydraulic diameter Reynolds number in the range from 2,000 to 6,000. Effects of the substrate plate thermal conductivity on the heater conjugate cooling were obtained from measurements with two distinct substrates: a Plexiglas plate and an aluminum plate. The experimental results for the heater conjugate cooling were described by a single dimensionless conjugate coefficient expressed as a function of the Reynolds number. The results also indicated that the conjugate coefficient is invariant with the heater power dissipation. In addition, the heater direct convective loss to the airflow was also evaluated and described by another invariant descriptor, the adiabatic Nusselt number, as a function of the duct Reynolds number.
机译：进行实验以研究安装在矩形管道下壁（基板）上的突出加热器的共轭强制对流传导冷却。加热器是一个铝制矩形块，通过嵌入电阻中的功耗进行加热。气流以2000到6,000的水力直径雷诺数进入管道。通过使用两种不同的基板：有机玻璃板和铝板进行测量，可以获得基板热导率对加热器共轭冷却的影响。加热器共轭冷却的实验结果由一个单一的无因次共轭系数表示，该系数表示为雷诺数的函数。结果还表明，共轭系数随加热器的功耗而不变。此外，还通过另一个不变的描述词，即绝热努塞尔数，根据管道雷诺数来评估和描述加热器对气流的直接对流损失。

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  • 来源
    《Heat Transfer Engineering》 |2015年第11期|984-990|共7页
  • 作者

    BRUNA R. LOIOLA; CARLOS A. C. ALTEMANI;

  • 作者单位

    Mechanical Engineering Department of Energy, State University of Campinas (UNICAMP) 13083-860, Campinas, SP, Brazil;

    Mechanical Engineering Department of Energy, State University of Campinas, Campinas, SP, Brazil;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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