A study on heat transfer enhancement using straight and twisted internal fin inserts

Tijing, Leonard D.; Pak, Bock Choon; Baek, Byung Joon; Lee, Dong Hwan

doi:10.1016/j.icheatmasstransfer.2006.02.006

Cited by 69 publications

(30 citation statements)

References 11 publications

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“…The augmentation techniques used were internally finned tubes [12], some with single-helix ridging [13], others with multi-helix ridging [14], micro-finned tubes [15][16][17], V-nozzle turbulators [18] and finned inserts [19].…”

Section: Introductionmentioning

confidence: 99%

Transitional flow inside enhanced tubes for fully developed and developing flow with different types of inlet disturbances: Part I – Adiabatic pressure drops

Meyer

Olivier

2011

International Journal of Heat and Mass Transfer

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a b s t r a c tDue to tube enhancements being used to achieve higher process efficiencies, heat exchangers are starting to operate in the transition region of flow. The paucity of data, however, has the implication that no correlation exists for enhanced tube transition flow. This article, being the first of a two-part paper, presents adiabatic friction factor data for four enhanced tubes for fully developed and developing flow in the transition region. Three inlets were used for developing flows, namely square-edged, re-entrant and bellmouth inlets. It was found that, as in the case of smooth tubes, transition was affected by the type of inlet used, with transition being delayed the most for the smoothest inlet. Correlations were developed to predict the fully developed critical Reynolds numbers and friction factors in the transition region. The correlations predicted the critical Reynolds numbers on average to within 1% with a root mean square deviation of less than 8%, while transition friction factors were predicted with a mean absolute error of 6.6%, predicting 89% of the data to within a 15% error.

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Section: Introductionmentioning

confidence: 99%

Transitional flow inside enhanced tubes for fully developed and developing flow with different types of inlet disturbances: Part I – Adiabatic pressure drops

Meyer

Olivier

2011

International Journal of Heat and Mass Transfer

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“…Most of the research was performed by heating the fluid, although there were some researchers who performed the experiments on the cooling of the liquid. The augmentation techniques used were internally finned tubes [15], some with single-helix ridging [16], others with multi-helix ridging [17], micro-finned tubes [18][19][20], V-nozzle turbulators [21] and finned inserts [22].…”

Section: Introductionmentioning

confidence: 99%

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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“…1a, b respectively. These surfaces differ from the enhanced surfaces studied previously such as internally finned tubes [12], tubes with internal single-helix ridging [13], with multi-helix ridging [14], micro-finned tubes [15][16][17][18][19][20], V-nozzle turbulators [21] and finned inserts [22,23].…”

Section: Introductionmentioning

confidence: 73%

“…In addition to the earlier studies on internally finned tubes, tubes with single-helix ridging, multi-helix ridging, V-nozzle turbulators etc., other newer enhanced surfaces that were studied include finned inserts by Tijing et al [22], enhanced surface coating by Kukulka and Leising [33] and Vipertube EHT by David et al [34]. For augmented surfaces in the laminar flow regime, most of the experiments were conducted by Marner and Bergles [35] with twisted tape inserts,…”

Section: Literature Reviewmentioning

confidence: 99%

Double tube heat exchanger with novel enhancement: part I—flow development length and adiabatic friction factor

Tiruselvam

Raghavan

2011

Heat Mass Transfer

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The study is conducted to evaluate the flow characteristics in a double tube heat exchanger using two new and versatile enhancement configurations. The novelty is that they are usable in single phase forced convection, evaporation and condensation. Correlations are proposed for flow development length and friction factor for use in predicting fluid pumping power in thermal equipment as well as in subsequent heat transfer characterization of the surface.

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A study on heat transfer enhancement using straight and twisted internal fin inserts

Cited by 69 publications

References 11 publications

Transitional flow inside enhanced tubes for fully developed and developing flow with different types of inlet disturbances: Part I – Adiabatic pressure drops

Transitional flow inside enhanced tubes for fully developed and developing flow with different types of inlet disturbances: Part I – Adiabatic pressure drops

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

Double tube heat exchanger with novel enhancement: part I—flow development length and adiabatic friction factor

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