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<p>Pulsating heat pipes (PHPs) have drawn substantial attention due to their intricate thermo-hydrodynamic properties and versatility in heat transfer applications, especially in gravity-free or unfavorable orientations. The current study focuses on improving the heat transfer efficiency and start-up characteristics of two-phase flow in PHPs with minimal heat input. A single-turn PHP utilizing nanofluids of Al<sub>2</sub>O<sub>3</sub>/CNT was numerically analyzed under various orientations (30°, 45°, 60°) and gravitational conditions (9.8&#xa0;ms<sup>−2</sup> and 5.5&#xa0;ms<sup>−2</sup>). The results indicated that: (i) the maximum heat transfer efficiency was achieved at an inclination angle of 45° under both earth’s gravity and microgravity conditions; (ii) the condenser dry-out occurred at an inclination angle of 30° across all heat inputs in microgravity, while evaporator dry-out was observed at 30° and 60° under Earth’s gravity with an evaporator temperature of 115&#xa0;K; (iii) the minimal start-up was achieved at a 60° inclination angle of with an evaporator temperature of 125&#xa0;K, under both Earth’s gravity and microgravity conditions.</p>

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A novel investigation on thermal performance and start-up of pulsating heat pipe at microgravity

  • 期刊论文

  • 发表日期：

    2025年8月19日

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  • Prem Shanker Yadav,
  • Raghvendra Gautam,
  • Suraj Bhan,
  • Hakan Caliskan

摘要

Pulsating heat pipes (PHPs) have drawn substantial attention due to their intricate thermo-hydrodynamic properties and versatility in heat transfer applications, especially in gravity-free or unfavorable orientations. The current study focuses on improving the heat transfer efficiency and start-up characteristics of two-phase flow in PHPs with minimal heat input. A single-turn PHP utilizing nanofluids of Al2O3/CNT was numerically analyzed under various orientations (30°, 45°, 60°) and gravitational conditions (9.8 ms−2 and 5.5 ms−2). The results indicated that: (i) the maximum heat transfer efficiency was achieved at an inclination angle of 45° under both earth’s gravity and microgravity conditions; (ii) the condenser dry-out occurred at an inclination angle of 30° across all heat inputs in microgravity, while evaporator dry-out was observed at 30° and 60° under Earth’s gravity with an evaporator temperature of 115 K; (iii) the minimal start-up was achieved at a 60° inclination angle of with an evaporator temperature of 125 K, under both Earth’s gravity and microgravity conditions.