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<p>Tube in Tube Heat Exchangers are simple in construction employed where the operating temperature needed is high. The primary focus is to boost thermal efficiency by using nanofluids as a cooling agent to optimize heat exchanger size while lowering weight, material, and manufacturing costs. In this regard, the current work focuses on using water-based low-concentration (vol.% = 0.01 and 0.05) nanofluids, specifically CuO, MgO, GO, and RGO nanofluids, to improve the performance of tube-in-tube heat exchangers. Experiments were conducted by keeping the cold-water flow rate (Rec = 6385) constant on the annulus side and by varying the Reynolds number (Reh) of the hot fluid between 3000 and 27000 on the tube side. Experimental findings show that, the minimum enhancement in Nusselt number by 4.99% and 7.69% respectively for 0.01 and 0.05 vol.% of RGO nanofluids, the maximum enhancement in Nusselt number by 13.25% and 19.7% respectively for 0.01 and 0.05 vol.% of MgO nanofluids in comparison with base fluid. Further, the maximum increase in friction factor values by 4.65% and 8.49% respectively for 0.01 and 0.05 vol.% of MgO nanofluids. The friction factor values were reduced by 1.9% and 2.9% respectively for 0.01 and 0.05 vol.% of RGO nanofluids in comparison with base fluid. It is clear from experiments that the best substitute for boosting the thermal performance of the tube-in-tube heat exchanger is 0.05 vol.% of water-based MgO nanofluid.</p>

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Investigations on thermal performance of counter flow tube in tube heat exchanger using water-based CuO, MgO, GO, and RGO nanofluids

  • 期刊论文

  • 发表日期：

    2025年4月18日

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  • B M Praveenkumara,
  • B Sadashive Gowda,
  • H M Shankara Murthy,
  • U Arun C Dixit,
  • R Shivashankar,
  • G D Chethana

摘要

Tube in Tube Heat Exchangers are simple in construction employed where the operating temperature needed is high. The primary focus is to boost thermal efficiency by using nanofluids as a cooling agent to optimize heat exchanger size while lowering weight, material, and manufacturing costs. In this regard, the current work focuses on using water-based low-concentration (vol.% = 0.01 and 0.05) nanofluids, specifically CuO, MgO, GO, and RGO nanofluids, to improve the performance of tube-in-tube heat exchangers. Experiments were conducted by keeping the cold-water flow rate (Rec = 6385) constant on the annulus side and by varying the Reynolds number (Reh) of the hot fluid between 3000 and 27000 on the tube side. Experimental findings show that, the minimum enhancement in Nusselt number by 4.99% and 7.69% respectively for 0.01 and 0.05 vol.% of RGO nanofluids, the maximum enhancement in Nusselt number by 13.25% and 19.7% respectively for 0.01 and 0.05 vol.% of MgO nanofluids in comparison with base fluid. Further, the maximum increase in friction factor values by 4.65% and 8.49% respectively for 0.01 and 0.05 vol.% of MgO nanofluids. The friction factor values were reduced by 1.9% and 2.9% respectively for 0.01 and 0.05 vol.% of RGO nanofluids in comparison with base fluid. It is clear from experiments that the best substitute for boosting the thermal performance of the tube-in-tube heat exchanger is 0.05 vol.% of water-based MgO nanofluid.