Experimental study of heat transfer enhancement with wire coil inserts in laminar-transition-turbulent regimes at different Prandtl numbers

Molina‐García, Ángel; Vicente, P.G.; Viedma, A.

doi:10.1016/j.ijheatmasstransfer.2005.04.024

Cited by 270 publications

(95 citation statements)

References 12 publications

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“…Senecal and Rothfus (1953), Nunner (1956), Koch (1960), Patel and Head (1969), Ghajar and Madon (1992), García et al (2005), and Churchill's (1977) correlation.…”

Section: Data Reductionmentioning

confidence: 99%

Single-Phase Heat Transfer and Pressure Drop of the Cooling of Water inside Smooth Tubes for Transitional Flow with Different Inlet Geometries (RP-1280)

Olivier¹,

Meyer

2010

HVAC&R Research

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“…Senecal and Rothfus (1953), Nunner (1956), Koch (1960), Patel and Head (1969), Ghajar and Madon (1992), García et al (2005), and Churchill's (1977) correlation.…”

Section: Data Reductionmentioning

confidence: 99%

Single-Phase Heat Transfer and Pressure Drop of the Cooling of Water inside Smooth Tubes for Transitional Flow with Different Inlet Geometries (RP-1280)

Olivier¹,

Meyer

2010

HVAC&R Research

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“…Most of the augmentation techniques involved the inserts of tapes [24] and wire coils [27,28]. No helical finned-type tubes have yet been tested in this region.…”

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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“…The augmentation of the each parameter on the heat transfer and pressure drop are reported by many researchers, e.g. Garcia et al [1], Naphon [2], Shoji et al [3], Gunes et al [4], Eiamsa-ard et al [5] and Akhawan-Behabadi et al [6]. Choudhari and Taji [7] have experimentally studied the effect of material type of coiled wires on the heat transfer and in pressure drop in DPHE.…”

Section: Introductionmentioning

confidence: 99%

Ribbed double pipe heat exchanger: experimental analysis

Al-Kayiem¹,

Al-Habeeb²

2014

WIT Transactions on Engineering Sciences

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Convection heat transfer can be enhanced by imposed turbulence in the annular flow of a double pipe heat exchanger. This paper presents and discusses the results obtained from experimental measurement by the installation of turbulence promoters, having rib configuration, on the inner surface of the cold flow annulus of a counter flow double-pipe heat exchanger. The promoters have been selected with rib's height to hydraulic diameter, e/D h equal to 0.107 and two pitch to height ratios, p/e equal to 10 and 15. The annular cold flow was investigated within Reynolds number range of 2000 to 20000. The measured data enabled us to estimate the friction factor, Reynolds number and Stanton number of each case in order to analyse the performance enhancement of the double pipe heat exchanger. The results showed that enhancement in the heat transfer, in terms of the Stanton number, was combined with a small penalty in the pressure drop, which was due to an increase in the friction factor values. Within the tested ranges of e/D h and Re, the performance index indicated enhancement of about 1.3 to 1.8 at pitch to p/e = 10. It is recommended to investigate more cases of rib's heights and installation in the hot fluid flow side.

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Experimental study of heat transfer enhancement with wire coil inserts in laminar-transition-turbulent regimes at different Prandtl numbers

Cited by 270 publications

References 12 publications

Single-Phase Heat Transfer and Pressure Drop of the Cooling of Water inside Smooth Tubes for Transitional Flow with Different Inlet Geometries (RP-1280)

Single-Phase Heat Transfer and Pressure Drop of the Cooling of Water inside Smooth Tubes for Transitional Flow with Different Inlet Geometries (RP-1280)

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

Ribbed double pipe heat exchanger: experimental analysis

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