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<p>With the widespread of the cylindrical radial rotating heat pipe (RRHP), enhancing its effective heat dissipation has become a challenge to ensure RRHP heat transfer characteristics. The heat transfer characteristics of a cylindrical radial rotating heat pipe (RRHP) are investigated by experimental method in the present paper. The effects of rotational speed, heating power, liquid filling ratio, and installation inclination angle on equivalent thermal conductivity (ETC) and thermal resistance of a wickless copper heat pipe is used to analyses the heat transfer characteristics of RRHP. The results demonstrate that the heat pipe exhibits optimal heat transfer performance with a minimum thermal resistance of 0.125&#xa0;K/W and an equivalent thermal conductivity of 2,216&#xa0;W/(m·K) at a 45% liquid filling ratio at various heating powers. The ETC decreases with an increasing rotational speed at input powers 31&#xa0;W and 47&#xa0;W, while it initially decreases and then increases at input powers 64&#xa0;W and 80&#xa0;W. The heat transfer performance of the RRHP is optimal at the inclination angle of 6°. The ETC of the RRHP is different for different filling rates at the same rotational speed, which are 45% &gt;25% &gt;65%. The RRHP start-up time decreases with increasing speed during static start-up of the RRHP. The increase in rotational speed effectively accelerates the dynamic start-up of the RRHP under different thermal input power conditions. The study provides design guidelines for their engineering applications in rotating machinery systems.</p>

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Experimental study of heat transfer characteristics of radial rotating heat pipe

  • 期刊论文

  • 发表日期：

    2025年10月29日

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  • Qing Yang,
  • Guoxu Yang,
  • Hongjuan Cheng,
  • Zhihao Liu,
  • Yun Ding,
  • Chenzhi Wang

摘要

With the widespread of the cylindrical radial rotating heat pipe (RRHP), enhancing its effective heat dissipation has become a challenge to ensure RRHP heat transfer characteristics. The heat transfer characteristics of a cylindrical radial rotating heat pipe (RRHP) are investigated by experimental method in the present paper. The effects of rotational speed, heating power, liquid filling ratio, and installation inclination angle on equivalent thermal conductivity (ETC) and thermal resistance of a wickless copper heat pipe is used to analyses the heat transfer characteristics of RRHP. The results demonstrate that the heat pipe exhibits optimal heat transfer performance with a minimum thermal resistance of 0.125 K/W and an equivalent thermal conductivity of 2,216 W/(m·K) at a 45% liquid filling ratio at various heating powers. The ETC decreases with an increasing rotational speed at input powers 31 W and 47 W, while it initially decreases and then increases at input powers 64 W and 80 W. The heat transfer performance of the RRHP is optimal at the inclination angle of 6°. The ETC of the RRHP is different for different filling rates at the same rotational speed, which are 45% >25% >65%. The RRHP start-up time decreases with increasing speed during static start-up of the RRHP. The increase in rotational speed effectively accelerates the dynamic start-up of the RRHP under different thermal input power conditions. The study provides design guidelines for their engineering applications in rotating machinery systems.