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This work investigates the combined impacts of tube angle and magnetization on the convective heat transfer coefficient (HTC) during condensation within a smooth tube in an R-134a-operated vapor compression refrigeration system (VCRS). The investigational test-rig consisted of a circular tube with a diameter of 9.58 mm and a length of 700 mm. Experiments were steered at a mass flux of 30 kg/m2s, with tube angles varying from +90° (vertically downward) to −90° (vertically upward) and magnetic field strengths ranging from 0.1 to 0.4 T. The evaporator load was held constant, and the magnetic field intensity was adjusted using magnet pairs. Results showed that applying both the magnetic field and tube inclination simultaneously enhanced the HTC. The optimal HTC occurred at a tube inclination of +15° across all cases. The study also revealed a significant impact of magnetic field intensity, with the best condenser performance observed at 0.3 T. When magnetic field and tube inclination were applied together, the HTC increased by 9.11%, 22%, and 48% compared to cases with only magnetic field, only tube inclination, and a conventional VCR system, respectively.

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Experimental Investigation of Tube Inclination and Magnetization on Convective Heat Transfer Coefficients of Tetrafluoroethane

  • 会议论文

  • 发表日期：

    2026年

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  • Rahul G. Deshmukh,
  • Yogesh G. Joshi,
  • Prashant Raut,
  • Vinit Gupta,
  • Arun Kose,
  • Vandita Thantharate

摘要

This work investigates the combined impacts of tube angle and magnetization on the convective heat transfer coefficient (HTC) during condensation within a smooth tube in an R-134a-operated vapor compression refrigeration system (VCRS). The investigational test-rig consisted of a circular tube with a diameter of 9.58 mm and a length of 700 mm. Experiments were steered at a mass flux of 30 kg/m2s, with tube angles varying from +90° (vertically downward) to −90° (vertically upward) and magnetic field strengths ranging from 0.1 to 0.4 T. The evaporator load was held constant, and the magnetic field intensity was adjusted using magnet pairs. Results showed that applying both the magnetic field and tube inclination simultaneously enhanced the HTC. The optimal HTC occurred at a tube inclination of +15° across all cases. The study also revealed a significant impact of magnetic field intensity, with the best condenser performance observed at 0.3 T. When magnetic field and tube inclination were applied together, the HTC increased by 9.11%, 22%, and 48% compared to cases with only magnetic field, only tube inclination, and a conventional VCR system, respectively.