What does this research mean for the field?

In a spiral-finned triple concentric tube heat exchanger, the spiral fin increases the Nusselt number by 30–40% compared to a plain tube, and utilizing 1–2% concentrations of Al₂O₃ or TiO₂ nanofluids provides the optimal balance of heat transfer enhancement and pumping penalty. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To quantitatively assess the thermohydraulic performance of a spiral-finned triple concentric tube heat exchanger utilizing water-based Al₂O₃, CuO, and TiO₂ nanofluids under varying flow conditions.

August 29, 2026Next EnergyOpen Access

Thermohydraulic assessment of a spiral-finned triple concentric tube heat exchanger using water-based Al₂O₃, CuO and TiO₂ nanofluids

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Authors

ABAbu BakkarKhulna University of Engineering and Technology DMDipayan MondalKhulna University of Engineering and Technology PAPran Gopal Roy AnikKhulna University of Engineering and Technology

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Implication

Numerical simulation demonstrates enhanced heat transfer using spiral fins and oxide nanofluids in triple concentric tubes, indicating an optimal design balance at low flow rates.

Key Points

To quantitatively assess the thermohydraulic performance of a spiral-finned triple concentric tube heat exchanger utilizing water-based Al₂O₃, CuO, and TiO₂ nanofluids under varying flow conditions.
Constructed a 3D computational model in ANSYS Fluent 2020 R1 and solved steady, pressure-based RNG k–ε turbulence equations using a single-phase nanofluid framework.
Evaluated parallel flow regimes across Reynolds numbers from 2,500 to 10,000 with nanoparticle concentrations of 0% to 3% by volume at inlet temperatures of 333 K (hot annulus), 303 K (inner tube), and 313 K (outer annulus).
Spiral fins increased the Nusselt number by approximately 30% to 40% compared to a plain triple concentric tube.
Nanofluids yielded higher Nusselt numbers primarily at lower Reynolds numbers, with diminishing thermal gains observed at volume fractions above 2%.
Pressure drop increased with flow speed and particle loading, whereas 1% to 2% Al₂O₃ and TiO₂ concentrations achieved the best thermal performance factor trade-off against pumping penalties.

Cite This Study

Bakkar et al. (2026) studied this question.

synapsesocial.com/papers/6a9299088e5d7d1fc0c10b6f https://doi.org/10.1016/j.nxener.2026.100943

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Implication

Numerical simulation demonstrates enhanced heat transfer using spiral fins and oxide nanofluids in triple concentric tubes, indicating an optimal design balance at low flow rates.

Thermohydraulic assessment of a spiral-finned triple concentric tube heat exchanger using water-based Al₂O₃, CuO and TiO₂ nanofluids

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Key Points

Cite This Study

Thermohydraulic assessment of a spiral-finned triple concentric tube heat exchanger using water-based Al₂O₃, CuO and TiO₂ nanofluids

Discussion

Member takes

Implication

Key Points

Cite This Study

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