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<p>The primary issue is enhancing heat-carrying capability, and phase change heat transfer is one of the advanced technologies used to increase the heat transfer rate. The purpose of this investigation is to experimentally analyze and evaluate the thermal performance of a closed-loop pulsating heat pipe under varying parameters, such as fill ratio, working fluid, and orientation, to determine the heat transfer efficiency. An experimental investigation of the closed-loop pulsating heat pipe (CLPHP) with a single-turn PHP is conducted in this work. The pulsating heat pipe is made of a brass tube with internal and exterior diameters (I.D. and O.D.) of 2&#xa0;mm and 3&#xa0;mm, respectively. The device’s inner diameter, fill ratio, working fluid, and orientation have been parametrically categorized. Aluminium oxide (Al<sub>2</sub>O<sub>3</sub>) and copper nanofluids, deionized (DI) water, were used as working fluids in studies with volumetric filling ratios of 50%, 60%, 70%, and 80%. The evaporator portion regulates the heat input, ranging from 0 to 100&#xa0;W. Verified the thermal performance of CLPHP at 0°, 30°, 45°, 60°, 75°, and 90° orientations. The test results reveal that orientation changes, fill ratio, and heat input have a significant impact on the thermal resistance of a PHP. A horizontal mode of operation achieved an effective heat transfer rate of 80%. The 30° orientation of pulsating heat pipe operation exhibits significant fluid movement and a 9.05% higher heat transfer rate when adding Al<sub>2</sub>O<sub>3</sub> nanofluid.</p>

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Variation of Heat Input and Orientation in a CLPHP with Al2O3/Copper Nanofluids: Application of Enhanced Heat Transfer

  • 期刊论文

  • 发表日期：

    2025年10月27日

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  • P. Venkataramana,
  • P. Vijaya Kumar,
  • B. Balakrishna

摘要

The primary issue is enhancing heat-carrying capability, and phase change heat transfer is one of the advanced technologies used to increase the heat transfer rate. The purpose of this investigation is to experimentally analyze and evaluate the thermal performance of a closed-loop pulsating heat pipe under varying parameters, such as fill ratio, working fluid, and orientation, to determine the heat transfer efficiency. An experimental investigation of the closed-loop pulsating heat pipe (CLPHP) with a single-turn PHP is conducted in this work. The pulsating heat pipe is made of a brass tube with internal and exterior diameters (I.D. and O.D.) of 2 mm and 3 mm, respectively. The device’s inner diameter, fill ratio, working fluid, and orientation have been parametrically categorized. Aluminium oxide (Al2O3) and copper nanofluids, deionized (DI) water, were used as working fluids in studies with volumetric filling ratios of 50%, 60%, 70%, and 80%. The evaporator portion regulates the heat input, ranging from 0 to 100 W. Verified the thermal performance of CLPHP at 0°, 30°, 45°, 60°, 75°, and 90° orientations. The test results reveal that orientation changes, fill ratio, and heat input have a significant impact on the thermal resistance of a PHP. A horizontal mode of operation achieved an effective heat transfer rate of 80%. The 30° orientation of pulsating heat pipe operation exhibits significant fluid movement and a 9.05% higher heat transfer rate when adding Al2O3 nanofluid.