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<p>The extensive use of heat transfer enhancement in a variety of industries, from electronics cooling to power plants, demonstrates its importance. The need for heat transfer augmentation in heat exchangers is driven by the need for improved efficiency, safety, cost savings, compactness, performance, and environmental sustainability. This study focuses on improving the thermal performance of a double pipe heat exchanger using heat transfer enhancement techniques, viz. V-threaded pipes (<i>P</i>/<i>Dt</i> = 1.0 and 2.0), water-based GO and RGO nanofluids (vol.% = 0.01 and 0.05), and a combination of these under counterflow conditions. The experiments were conducted by utilizing GO and RGO nanofluids at hot side of DPHE with&#xa0;diverse flow rates (3000 ≤ Re ≤ 27,000), whereas the distilled water flowing in the annulus maintained a set flow rate (6385). The experimental results show that DPHE using an external V-threaded pipe (<i>P</i>/<i>Dt</i> = 1.0) in combination with GO nanofluid (vol.% = 0.05) yields the highest increase in Nu by 62.5% and FoM by 1.931 times as compared to base fluid in a smooth pipe. The friction factor increased by 73.6% for GO nanofluid (vol.% = 0.01) and internal V-threaded pipe (<i>P/Dt</i> = 1.0) combination compared to base fluid in a smooth pipe. These findings imply that neither the threaded pipe nor the nanofluids in smooth pipe alone enhanced Nu as much as the threaded pipe and nanofluids in combination. Further, the developed Nusselt number and friction factor correlations were substantially within predicted ranges of ± 15% and ± 12%, respectively.</p> Graphical abstract <p></p>

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Effect on thermal performance of counterflow V-threaded DPHE using water-based GO and RGO nanofluids

  • 期刊论文

  • 发表日期：

    2025年8月11日

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  • B. M. Praveenkumara,
  • B. Sadashive Gowda,
  • H. M. Shankara Murthy,
  • P. Bharath,
  • P. T. Sowmya,
  • U. Arun C. Dixith

摘要

The extensive use of heat transfer enhancement in a variety of industries, from electronics cooling to power plants, demonstrates its importance. The need for heat transfer augmentation in heat exchangers is driven by the need for improved efficiency, safety, cost savings, compactness, performance, and environmental sustainability. This study focuses on improving the thermal performance of a double pipe heat exchanger using heat transfer enhancement techniques, viz. V-threaded pipes (P/Dt = 1.0 and 2.0), water-based GO and RGO nanofluids (vol.% = 0.01 and 0.05), and a combination of these under counterflow conditions. The experiments were conducted by utilizing GO and RGO nanofluids at hot side of DPHE with diverse flow rates (3000 ≤ Re ≤ 27,000), whereas the distilled water flowing in the annulus maintained a set flow rate (6385). The experimental results show that DPHE using an external V-threaded pipe (P/Dt = 1.0) in combination with GO nanofluid (vol.% = 0.05) yields the highest increase in Nu by 62.5% and FoM by 1.931 times as compared to base fluid in a smooth pipe. The friction factor increased by 73.6% for GO nanofluid (vol.% = 0.01) and internal V-threaded pipe (P/Dt = 1.0) combination compared to base fluid in a smooth pipe. These findings imply that neither the threaded pipe nor the nanofluids in smooth pipe alone enhanced Nu as much as the threaded pipe and nanofluids in combination. Further, the developed Nusselt number and friction factor correlations were substantially within predicted ranges of ± 15% and ± 12%, respectively.

Graphical abstract