Mixed Convection Heat Transfer and Isothermal Pressure Drop in Corrugated Tubes for Laminar and Transition Flow

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

doi:10.1016/s0735-1933(04)00052-1

Cited by 108 publications

(58 citation statements)

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“…Similar conclusions were made by Vicente et al [36,39], who performed tests on corrugated and dimpled tubes. Their correlations predicted the critical Reynolds numbers only in terms of the roughness-height-to-diameter ratio.…”

Section: Enhanced Tubes: Fully Developed Flowsupporting

confidence: 85%

“…Since very few data regarding these values for enhanced tubes exist (including the present data), the data of Vicente et al [39] were utilised in the development of correlations. The choice for using the helical corrugated tube data was due to these tubes having the closest resemblance to the current enhanced tubes for the available data.…”

Section: Critical Reynolds Numbersmentioning

confidence: 99%

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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: Enhanced Tubes: Fully Developed Flowsupporting

confidence: 85%

Section: Critical Reynolds Numbersmentioning

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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“…The mechanism for improvement of the heat transfer performance in the passive method is by promoting turbulence near the tube wall surface to reduce the thermal boundary layer thickness. Another mechanism is based on intense fluid mixing by modified tubes such as finned tube, tube with rib, tube with spirally roughened wall, corrugated tube, fluted tube, helical tube, elliptical axis tube and microfin tube [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33]. Among the modified tubes, the corrugated tube and the fluted tube have become important for heat transfer enhancement in turbulent single phase flow as the pressure drop increment is reasonable.…”

Section: Literature Reviewmentioning

confidence: 99%

“…Rozzi et al [21] examined the influence of wall corrugation on heat transfer and pressure loss in a shell and tube heat exchanger using Newtonian and non-Newtonian fluids. Vicente et al [22] carried out experiments to study the heat transfer in corrugated tubes for laminar and turbulent flows using water and ethylene glycol as the working fluids. They observed that the corrugated tubes provide higher heat transfer and friction factor, up to 25 and 30% respectively, than the smooth tube.…”

Section: Literature Reviewmentioning

confidence: 99%

Double tube heat exchanger with novel enhancement: part II—single phase convective heat transfer

Tiruselvam¹,

Chin²,

Raghavan³

2012

Heat Mass Transfer

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The study is conducted to evaluate the heat transfer characteristics of two new and versatile enhancement configurations in a double tube heat exchanger annulus. The novelty is that they are usable in single phase forced convection, evaporation and condensation. Heat transfer coefficients are determined by the Wilson Plot technique in laminar and turbulent flow and correlations are proposed for Nusselt numbers. Comparisons are then made between heat transfer and flow friction.

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“…In the case of coiled tubes or corrugated tubes under laminar flow, the development of secondary flows improves fluid mixing and, consequently, heat transfer. However, the mathematical modeling of these cases is more complex and studies often rely on empirical correlations (Barba et al, 2002;Vicente et al, 2004;Naphon, 2007;Pimenta and Campos, 2013;Pawar and Sunnapwar, 2013).…”

Section: Introductionmentioning

confidence: 99%

Determination of the Effective Radial Thermal Diffusivity for Evaluating Enhanced Heat Transfer in Tubes Under Non-Newtonian Laminar Flow

Morais

Gut

2015

Braz. J. Chem. Eng.

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-Enhanced heat transfer in tubes under laminar flow conditions can be found in coils or corrugated tubes or in the presence of high wall relative roughness, curves, pipe fittings or mechanical vibration. Modeling these cases can be complex because of the induced secondary flow. A modification of the Graetz problem for non-Newtonian power-law flow is proposed to take into account the augmented heat transfer by the introduction of an effective radial thermal diffusivity. The induced mixing was modeled as an increased radial heat transfer in a straight tube. Three experiments using a coiled tube and a tubular heat exchanger with high relative wall roughness are presented in order to show how this parameter can be obtained. Results were successfully correlated with Reynolds number. This approach can be useful for modeling laminar flow reactors (LFR) and tubular heat exchangers available in the chemical and food industries.

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Mixed Convection Heat Transfer and Isothermal Pressure Drop in Corrugated Tubes for Laminar and Transition Flow

Cited by 108 publications

References 0 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

Double tube heat exchanger with novel enhancement: part II—single phase convective heat transfer

Determination of the Effective Radial Thermal Diffusivity for Evaluating Enhanced Heat Transfer in Tubes Under Non-Newtonian Laminar Flow

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