Heat transfer in all pipe flow regimes: laminar, transitional/intermittent, and turbulent

Abraham, John; Sparrow, E. M.; Tong, Jimmy C.K.

doi:10.1016/j.ijheatmasstransfer.2008.07.009

Cited by 150 publications

(49 citation statements)

References 26 publications

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“…It was later developed by the present authors in a series of studies which extended its use to internal flows, flows with adverse pressure gradients in diffusers, and pulsating flows [21][22][23][24][25][26][27][28][29][30]. Both the SST method and the newly developed transitional method rely upon a control-volume solution method wherein conservation equations are developed at a multitude of elements which constitute the solution domain.…”

Section: Fluid Dynamic Modelmentioning

confidence: 99%

Turbulent and Transitional Modeling of Drag on Oceanographic Measurement Devices

Abraham

Gorman

Reseghetti

et al. 2012

Modelling and Simulation in Engineering

164

241

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Computational fluid dynamic techniques have been applied to the determination of drag on oceanographic devices (expendable bathythermographs). Such devices, which are used to monitor changes in ocean heat content, provide information that is dependent on their drag coefficient. Inaccuracies in drag calculations can impact the estimation of ocean heating associated with global warming. Traditionally, ocean-heating information was based on experimental correlations which related the depth of the device to the fall time. The relation of time-depth is provided by a fall-rate equation (FRE). It is known that FRE depths are reasonably accurate for ocean environments that match the experiments from which the correlations were developed. For other situations, use of the FRE may lead to depth errors that preclude XBTs as accurate oceanographic devices. Here, a CFD approach has been taken which provides drag coefficients that are used to predict depths independent of an FRE.

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Section: Fluid Dynamic Modelmentioning

confidence: 99%

Turbulent and Transitional Modeling of Drag on Oceanographic Measurement Devices

Abraham

Gorman

Reseghetti

et al. 2012

Modelling and Simulation in Engineering

164

241

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“…Later on, the impact of the bonding resistance will be studied in more detail. To determine the interior convective resistance, the Gnielinski correlation [44] found that the Gnielinski correlation is only supported by experimental data in the range Re w > 3100 and should not be used below that value. In the current study Re w varied between 3100 and 7500 during the measurements.…”

Section: Data Reductionmentioning

confidence: 99%

Thermo-hydraulic study of a single row heat exchanger consisting of metal foam covered round tubes

T’Joen

Jaeger

Huisseune

et al. 2010

International Journal of Heat and Mass Transfer

115

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Open cell metal foam is a novel engineering material that offers an interesting combination of materials properties from a heat exchanger point of view such as a high specific surface area, tortuous flow paths for flow mixing and low weight. A new heat exchanger design with metal foams is studied in this work, aimed at low airside pressure drop. It consists of a single row of aluminum tubes covered with thin layers (4-8 mm) of metal foam. Through wind tunnel testing the impact of various parameters on the thermo-hydraulic performance was considered, including the Reynolds number, the tube spacing, the foam height and the type of foam. The results indicated that providing a good metallic bonding between the foam and the tubes can be achieved, metal foam covered tubes with a small tube spacing, small foam heights and made of foam with a high specific surface area potentially offer strong benefits at higher air velocities (> 4 m/s) compared to helically finned tubes. The bonding was done by conductive epoxy glue and was found to have a strong impact on the final results, showing a strong need for a cost-effective and efficient brazing process to connect metal foams to the tube surfaces.

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“…For inspecting the reliability and accuracy of the selfmade experimental system, the pure water as work fluid measured the Nusselt number change with Reynolds number in the range of 2400-3300. The measurements values, which are shown in Figure 3, are compared with the calculated values via the classical Gnielinski equation [17]. From the figure, the deviations between measured and calculated values are less than 12% over the Reynolds number range, which is located in the allowable range of deviation in transition region [9,10].…”

Section: Resultsmentioning

confidence: 94%

“…The results were compared with the predictions of the following Gnielinski equation [17] under fully developed section in transition region:…”

Section: Relative Problem Calculation Formulamentioning

confidence: 99%

Experimental Investigation into the Forced Convective Heat Transfer of Aqueous Fe₃O₄ Nanofluids under Transition Region

et al. 2013

Journal of Nanoparticles

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The forced convective heat transfer (FCHT) properties of nanofluids, made of Fe 3 O 4 nanomaterials and deionized water, are firstly measured by a self-made forced convective heat transfer apparatus. The nanofluid flows through a horizontal copper tube in the transition region with Reynolds numbers in the range of 2500-5000. Some parameters including Reynolds number, axial distance, and mass concentration are also investigated. The preliminary results are firstly presented that the heat transfer coefficients of Fe 3 O 4 nanofluids systematically decrease with increasing concentration of nanoparticles under transition region which contradicts the initial expectation.

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Heat transfer in all pipe flow regimes: laminar, transitional/intermittent, and turbulent

Cited by 150 publications

References 26 publications

Turbulent and Transitional Modeling of Drag on Oceanographic Measurement Devices

Turbulent and Transitional Modeling of Drag on Oceanographic Measurement Devices

Thermo-hydraulic study of a single row heat exchanger consisting of metal foam covered round tubes

Experimental Investigation into the Forced Convective Heat Transfer of Aqueous Fe₃O₄ Nanofluids under Transition Region

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Heat transfer in all pipe flow regimes: laminar, transitional/intermittent, and turbulent

Cited by 150 publications

References 26 publications

Turbulent and Transitional Modeling of Drag on Oceanographic Measurement Devices

Turbulent and Transitional Modeling of Drag on Oceanographic Measurement Devices

Thermo-hydraulic study of a single row heat exchanger consisting of metal foam covered round tubes

Experimental Investigation into the Forced Convective Heat Transfer of Aqueous Fe3O4 Nanofluids under Transition Region

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Product

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Experimental Investigation into the Forced Convective Heat Transfer of Aqueous Fe₃O₄ Nanofluids under Transition Region