Development and verification of general correlations for pressure drop and heat transfer in single-phase turbulent flow in enhanced tubes

Ravigururajan, T. S.; Bergles, A. E.

doi:10.1016/0894-1777(96)00014-3

Cited by 176 publications

(57 citation statements)

References 18 publications

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“…Above a Reynolds number of 8000, the Carnavos [15] correlation predicts the 18 tubes (E 1 and E 3 ) with good accuracy, while underpredicting the 27 tubes (E 2 and E 4 ). The Ravigururajan and Bergles [42] correlation overpredicts all the data although it seems to predict the 18 and 27 tubes with the same accuracy. The Jensen and Vlakancic [43] correlation appears to follow the right trend at low Reynolds numbers although it has the greatest scatter between different helix angles.…”

Section: Comparisonmentioning

confidence: 98%

Transitional flow inside enhanced tubes for fully developed and developing flow with different types of inlet disturbances: Part II–heat transfer

Meyer

Olivier

2011

International Journal of Heat and Mass Transfer

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a b s t r a c tDue to efficiency demands, augmented tubes are often used in heat exchangers with the result that many heat exchangers operate in the transitional region of flow. Due to the paucity of data, however, no data exists for enhanced tubes in this region. This article, being the second of a two-part paper (Part I investigating adiabatic flow), presents experimental heat transfer and diabatic friction factor data for four horizontal enhanced tubes for fully developed and developing flow in the transition region with four different types of inlet geometries. Smooth tube data was used for comparison. It was found that, unlike results obtained for adiabatic flow in Part I, inlet disturbances had no effect on the critical Reynolds numbers, with transition occurring at a Reynolds number of approximately 2000 and ending at 3000. Correlations were developed to predict the heat transfer and friction factors for a wide range of flow regimes, from laminar to turbulent flow. The correlations predicted the heat transfer data on average with a mean absolute error of 9.5%, predicting 85% of the data to within 15%. The friction factor correlations predicted the data with a mean absolute error of 5.5%, predicting 96% of the data to within 20%.

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Section: Comparisonmentioning

confidence: 98%

Transitional flow inside enhanced tubes for fully developed and developing flow with different types of inlet disturbances: Part II–heat transfer

Meyer

Olivier

2011

International Journal of Heat and Mass Transfer

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“…Rahai and Wong [9] carried out experiments with air as heat transfer fluid and fund that coil with larger pitch spacing increase mixing, turbulent kinetic energy and half width but reduces maximum mean velocity. Ravigururajan and Bergles [7] also developed similar correlations by carrying out various experimental studies using water as the working fluid.…”

Section: Wire Coil In Turbulent Flowmentioning

confidence: 90%

“…In 2002, K. Torii [7] came with a unique heat transfer enhancement which not only brought heat transfer augmentation of 10%-30% but also reduced pressure loss of 34%-55% for staggered tube banks when Re as varied from 2100-350.…”

Section: Passive Vortex Methods: a Detailed Review On Recent Geomentioning

confidence: 99%

“…The important investigations of wire coil include experiments carried out by Ravigururajan and Bergles [7] who developed correlations for friction factor and heat transfer coefficient that are widely applied. By incorporating the roughness type and Prandtl number their heat transfer data from correlation were in good agreement with the correlation of Petukov and Popov [8].…”

Section: Wire Coil Insertsmentioning

confidence: 99%

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Review on Recent Progresses in Heat Transfer Enhancement Through the Use of Passive Vortex Generators and Its Applications in Solar Parabolic Trough Systems

2017

IJAERD

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“…Twelve different coil-wire inserts were tested in turbulent flow regions. ( Ravigururajan and Bergles, 1996 ) presented the general correlations for the friction factor and heat-transfer coefficient for the single-phase turbulent flow in internally augmented tubes. Different types of commercial ribbed tubes were tested under heating conditions.…”

Section: Introductionmentioning

confidence: 99%

CFD Analysis of Enhancement of Turbulent Flow Heat Transfer in a Horizontal Circular Tube with Twisted Tape Inserts

Gaddem¹

2018

IJRASET

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The present work includes the results of Cfd analysis of enhancement of turbulent flow heat transfer in a horizontal circular tube with twisted tape inserts with air as working fluid. The Reynolds number ranged from 6000 to 14000. It is observed that enhancement of heat transfer as compared to the conventional bare tube at the same mass flow rate was found to be a factor of 3 to 5 times, were as the friction factor rise was about a factor of 5 times for different tube inserts. Finally we compared results with theoretical values (Dittus-Boelter Equation)by using tool of package of ANSYS-Fluent. Geometries for plain tube, and tube with different inserts is developed in ICEM CFD (3D) with fine meshing and exported to Ansys-Fluent, then suitable boundary conditions are applied to these models and solved energy, momentum and turbulence equations and results obtained are discussed.

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Development and verification of general correlations for pressure drop and heat transfer in single-phase turbulent flow in enhanced tubes

Cited by 176 publications

References 18 publications

Transitional flow inside enhanced tubes for fully developed and developing flow with different types of inlet disturbances: Part II–heat transfer

Transitional flow inside enhanced tubes for fully developed and developing flow with different types of inlet disturbances: Part II–heat transfer

Review on Recent Progresses in Heat Transfer Enhancement Through the Use of Passive Vortex Generators and Its Applications in Solar Parabolic Trough Systems

CFD Analysis of Enhancement of Turbulent Flow Heat Transfer in a Horizontal Circular Tube with Twisted Tape Inserts

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