Helically-coiled-wire-induced swirl flow heat transfer and pressure drop in a circular tube under velocities controlled

Hata, Kenji; Shibahara, Masakazu

doi:10.1016/j.ijheatmasstransfer.2023.123849

Cited by 6 publications

(2 citation statements)

References 31 publications

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“…Thus, the average inner heat transfer coefficient (h i ) is calculated based on the average heat transfer rate (Q avg ) Q :;< = = > = ? (7) When calculating the average heat transfer coefficient of the inner side, it is assumed that the surface temperature of the tube wall is constant. Therefore, by neglecting the thermal resistance of the copper pipe wall, the heat transfer coefficient (h i ) is calculated as follows [20]:…”

Section: Uncertainties In Measurementsmentioning

confidence: 99%

“…Triangular, square, rectangular, and hexagonal cross sections were. Authors in [7] measured the swirl flow heat transfer and pressure drop for water using helical coil wire with exponentially increasing heat input at different mass velocities. The authors also numerically solved the k-ε turbulence model in a circular tube considering the temperature dependence of the thermophysical properties concerned.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation of Heat Transfer and Pressure Drop Performance of a Circular Tube with Coiled Wire Inserts

Kapse,

Shewale,

Barahate

et al. 2024

Eng. Technol. Appl. Sci. Res.

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This paper evaluates the thermo-hydraulic performance of a coiled wire passive insert for internal turbulent flow through a circular copper tube test section in an in-tube exchanger. Experiments were carried out using water as the working fluid with Reynolds number ranging from 8000 to 32000. The experimental setup was validated for Nusselt number and friction factor with well-established equations for plain tubes. The average Nusselt number ratios (Nua/Nup) and the friction factor ratios (fa/fp) for the augmented tube case over the plain tube case are reported to range from 1.55 to 1.38 and from 1.513 to 1.583, respectively. The average performance ratios considering equal pumping power criteria are also reported and found in the range of 0.846 to 0.921. The study concludes that coiled wire inserts are suitable for heat transfer augmentation applications where pumping power is of minor concern.

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Section: Uncertainties In Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%