Heat transfer enhancement in circular tubes using helical swirl generator insert at the entrance

Hasan, Gul; Evin, Duygu

doi:10.1016/j.ijthermalsci.2006.12.010

Cited by 51 publications

(20 citation statements)

References 17 publications

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“…Bearing in mind the quantification of thr enhanced heat transfer, Gul and Evin [5] showed that an increase of 300% of heat transfer can be achieved by placing a helical tape at the begining of the test section. Nuntadusit et al [6] studied the effect on Nusselt number of different set ups of multiple swirling jets.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Swirling Flows - Heat Transfer Enhancement

Parra¹,

Borrajo‐Pérez²,

Rodrı́guez³

et al. 2015

JFFHMT

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In this paper, the influence of swirl number on mixing of two confined coaxial jets is analysed. The swirl generator is a set of fixed vanes located in the annular nozzle. Different trailing edge angles result in swirl numbers ranging from 0.14 to 0.95. Numerical model is validated using non reactive benchmarks. Low, intermediate and large swirling injectors are simulated to contrast the flow pattern. The presence of Inner Recirculation Zone associated to intermediate and high swirl numbers plays an important role in the heat and mass transfer since promote high gradients with minimum head loss. Low swirl injectors show large mixing regions in absence of the central vortex structure.

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Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Swirling Flows - Heat Transfer Enhancement

Parra¹,

Borrajo‐Pérez²,

Rodrı́guez³

et al. 2015

JFFHMT

View full text Add to dashboard Cite

show abstract

“…In the present work, the experimental uncertainty estimated using the method of Moffat [34,35] was used. The effect of the uncertainty in a single measurement on the calculated result, if only one measurement was in error, would be When several independent variables are used in the function , the individual terms are combined by root-sum-square method:…”

Section: Data Reductionmentioning

confidence: 99%

Performance Assessment in a Heat Exchanger Tube with Opposite/Parallel Wing Twisted Tapes

Eiamsa-ard

Pimsarn

Thianpong

2014

Advances in Mechanical Engineering

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The thermohydraulic performance in a tube containing a modified twisted tape with alternate-axes and wing arrangements is reported. This work aims to investigate the effects of wing arrangements (opposite (O) and parallel (P) wings) at different wing shapes (triangle (Tri), rectangular (Rec), and trapezoidal (Tra) wings) and on the thermohydraulic performance characteristics. The obtained results show that wing twisted tapes with all wing shape arrangements (O-Tri/O-Rec/O-Tra/P-Tri/P-Rec/P-Tra) give superior thermohydraulic performance and heat transfer rate to the typical twisted tape. In addition, the tapes with opposite wing arrangement of O-Tra, O-Rec, and O-Tri give superior thermohydraulic performances to those with parallel wing arrangement of P-Tra, P-Rec, and P-Tri around 2.7%, 3.5%, and 3.2%, respectively.

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“…Gül and Evin [12] used short length helical screw to enhance the heat transfer inside pipe. They achieved a net energy gain up to 20% depending upon Reynolds number, tape angle and channels number.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer characteristics and friction of turbulent swirling air flow through abrupt expansion

Khalil¹,

Zohir²,

Farid³

2010

AJSIR

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Heat transfer and pressure drop characteristics of turbulent swirling air flow through a sudden expansion pipe with different swirl angles and different sudden expansion ratios were investigated experimentally. The effect of the sudden expansion ratio, Reynolds number, vane angle and swirl generator location on the heat transfer and pressure drop were examined. The test pipe is uniformly heated and the Reynolds number ranges from 9,000 to 41,000. It was found that, inserting a swirl generator inside sudden expansion pipe causes an increase in both the relative mean Nusselt number and the enhancement efficiency of the tested pipe. The enhancement efficiency increases with Reynolds number decreasing while it increases with the increase in sudden expansion ratio (d/D decreases) and vane angle. A maximum efficiency up to 405% could be achieved. Correlations for Nusselt number and friction factor for the swirl flow are obtained. The performance evaluation criterion to access the real benefits in using the swirl generators of the enhanced tube is discussed.

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Heat transfer enhancement in circular tubes using helical swirl generator insert at the entrance

Cited by 51 publications

References 17 publications

Numerical Simulation of Swirling Flows - Heat Transfer Enhancement

Numerical Simulation of Swirling Flows - Heat Transfer Enhancement

Performance Assessment in a Heat Exchanger Tube with Opposite/Parallel Wing Twisted Tapes

Heat transfer characteristics and friction of turbulent swirling air flow through abrupt expansion

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