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Heat transfer augmentation within heat exchangers has become vital in cutting costs and shrinking thermal management devices. Passive heat transfer enhancement techniques are commonly used to boost efficiency. Twisted tapes, coils, ribs, grooves, conical inserts, etc., are a few passive methods. The thermal efficiency of Twisted Tapes (TT) can be further improved by further modifications. A numerical investigation is performed on a circular pipe with peripheral Rectangular Cut Twisted Tape (RCTT) to investigate its thermo-hydraulic performance in a turbulent flow. Nusselt number (Nu) and friction factor (f) are calculated for circular pipe with RCTT and classic twisted tape for Reynolds number (Re) spanning 10,000 to 19,000. A uniform heat flux of 25,000 W/m2 is considered for the present study. A CFD Software program called ANSYS FLUENT 18.2 is used to run the numerical simulations. The study’s findings show that both Nu and f rise with Reynolds number. In contrast to the standard twisted tape, RCTT provides fluid mixing between two swirl flows, enhancing heat transfer. RCTT has been found to be superior to classic twisted tape and smooth pipe in terms of heat transmission and pressure drop. In the RCTT, the average Nu & f are 15% and 20% higher than a classic twisted tape.

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Numerical Investigation on Heat Transfer and Fluid Flow in a Circular Tube with Rectangular Cut Twisted Tape

  • 会议论文

  • 发表日期：

    2025年

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  • Soumith Voddepalli,
  • Sujit Nath,
  • Agnimitra Biswas

摘要

Heat transfer augmentation within heat exchangers has become vital in cutting costs and shrinking thermal management devices. Passive heat transfer enhancement techniques are commonly used to boost efficiency. Twisted tapes, coils, ribs, grooves, conical inserts, etc., are a few passive methods. The thermal efficiency of Twisted Tapes (TT) can be further improved by further modifications. A numerical investigation is performed on a circular pipe with peripheral Rectangular Cut Twisted Tape (RCTT) to investigate its thermo-hydraulic performance in a turbulent flow. Nusselt number (Nu) and friction factor (f) are calculated for circular pipe with RCTT and classic twisted tape for Reynolds number (Re) spanning 10,000 to 19,000. A uniform heat flux of 25,000 W/m2 is considered for the present study. A CFD Software program called ANSYS FLUENT 18.2 is used to run the numerical simulations. The study’s findings show that both Nu and f rise with Reynolds number. In contrast to the standard twisted tape, RCTT provides fluid mixing between two swirl flows, enhancing heat transfer. RCTT has been found to be superior to classic twisted tape and smooth pipe in terms of heat transmission and pressure drop. In the RCTT, the average Nu & f are 15% and 20% higher than a classic twisted tape.