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In the present study, a straight heat pipe with a flat evaporator measuring (100 × 100 × 30 mm) was the subject of systematic experimental experiments. To represent the heat source of the electronic section, a (100 × 100 mm) flat square electrical element has been utilized. This study aims to demonstrate the impact of cooling water mass flow rate and filling ratio on the thermal efficiency of straight heat pipes (thermosiphons). The effectiveness of wickless heat pipes was tested for input power levels reaching from (10 W) to (100 W). In the current work, the following filling rates were used: 15%, 25%, 50% and 85%. Additionally, the rate of the mass flow of cooling water was adjusted from (0.0083 kg/s) to (0.033 kg/s). According to the investigational findings, the highest wall temperature of evaporator at a (15%) filling ratio and a (100 W) input power was recorded at (115 ℃). The results additionally demonstrated that the total resistance’s highest value was 0.8 ℃/W.

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Experimental Study of Thermal Performance of Thermosyphon Heat Pipe (THP) with Rectangular Evaporator

  • 会议论文

  • 发表日期：

    2026年

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  • Samah E. Al-Sa’di,
  • Dhamyaa S. Khudhur,
  • Akram W. Ezzat,
  • Eric Hu

摘要

In the present study, a straight heat pipe with a flat evaporator measuring (100 × 100 × 30 mm) was the subject of systematic experimental experiments. To represent the heat source of the electronic section, a (100 × 100 mm) flat square electrical element has been utilized. This study aims to demonstrate the impact of cooling water mass flow rate and filling ratio on the thermal efficiency of straight heat pipes (thermosiphons). The effectiveness of wickless heat pipes was tested for input power levels reaching from (10 W) to (100 W). In the current work, the following filling rates were used: 15%, 25%, 50% and 85%. Additionally, the rate of the mass flow of cooling water was adjusted from (0.0083 kg/s) to (0.033 kg/s). According to the investigational findings, the highest wall temperature of evaporator at a (15%) filling ratio and a (100 W) input power was recorded at (115 ℃). The results additionally demonstrated that the total resistance’s highest value was 0.8 ℃/W.