Numerical Analysis of Turbulent Flow in a Small Helically Segmented Finned Tube Bank

Martínez-Espinosa, E.; Vicente, W.; Salinas-Vázquez, M.; Carvajal-Mariscal, Ignacio

doi:10.1080/01457632.2016.1156396

Cited by 13 publications

(10 citation statements)

References 12 publications

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“…Utilizing perforated fins with two-hole radii R 1.25 and R 1.85 [19] reduced the weight by 6.62%-9.49%, respectively. In line with this finding, other articles observed a reduction in weight [20,21].…”

Section: Circular Finned Heat Exchanger [4]supporting

confidence: 73%

“…The research was conducted to compare numerical and experimental measurements using helically segmented (serrated) finned tubes [20], which are employed in commercial applications due to their lower weight than plain fins, capacity to induce disturbance, and reduced heat transfer surface. The ultimate goal is to provide periodic boundary condition requirements for discrete finned tube modules.…”

Section: Other Studiesmentioning

confidence: 99%

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A review on the modification of circular fin and tube heat exchangers through new innovative fin shapes

2022

IJATEE

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Heat exchanger tubes with circular fins have been widely used in industrial and commercial applications over the past decade and are considered one of the major researcher's concerns in a range of engineering applications for their affordable cost and potential future to improve heat transfer. This review summarises the recently optimised circular fins (needle, trimmed, crimped, perforated) and how they affect heat transmission, the pressure generated and weight. Where varying fin-related parameters (fin height, fin material, the gap between fins, and number of fins) and flow-related parameters (inlet air velocity or manufacturing fin design) are aimed to optimise the performance in a different manner.In conclusion, designs of novel fin shapes remained a challenging field and demanded more studies to reinforce the existing papers to accomplish the optimum required performance.

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Section: Circular Finned Heat Exchanger [4]supporting

confidence: 73%

Section: Other Studiesmentioning

confidence: 99%

A review on the modification of circular fin and tube heat exchangers through new innovative fin shapes

2022

IJATEE

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“…Local flow features were compared with experimental measurements, but global heat transfer and pressure drop were only compared with selected correlations, though with good agreement. In a consecutive paper [16], they went on to model six tube rows using standard inlet-outlet boundary condition, and showed that the velocity, temperature and turbulence fields indeed display periodic behaviour after the third tube row.…”

Section: Gas Flowmentioning

confidence: 99%

Numerical modelling of fin side heat transfer and pressure loss for compact heat recovery steam generators

Espelund¹,

H.²,

Skaugen³

2022

Linköping Electronic Conference Proceedings

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An optimization tool for offshore bottoming cycle and heat recovery steam generator (HRSG) design has previously been developed. The tool is based on empirical correlations to obtain hydraulic and thermal quantities for the HRSG. However, as these correlations are based on experiments with typical onshore designs, they may not be valid for the compact designs encountered in offshore HRSGs.In order to extend the validity range of the optimization tool, this work presents a numerical model able to predict heat transfer and pressure loss in finned tube bundles by means of Computational Fluid Dynamics (CFD), utilizing a periodic domain to reduce computational costs. Both steady-state and transient models were applied, using the Spalart-Allmaras turbulence model, and their performance compared. To validate the model, results were compared with available experimental data, and then the model’s performance was compared with a selected empirical correlation.Three different fin-tube geometries were investigated (two serrated and solid) with varying tube layout angles. A parameterized grid generation tool was developed and used to generate grids for the selected geometries. The CFD results were found to be within 20 % of the experimental data, and were in most cases more accurate than the empirical correlation. The steady-state simulations did, however, not converge for the geometry with the largest layout angle. The steady-state framework should therefore be applied only to compact tube layouts. The transient simulations, though being computationally more intensive, are also able to model large layout angles.

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“…Detailed flow field data were also compared to experimental measurements. The authors went on to perform similar modeling of a six-row tube bundle including inlet and outlet regions in a subsequent publication [19]. A major conclusion of this work was that velocity, temperature and turbulence fields indeed show periodic behavior after the third tube row and that a fully periodic model therefore is appropriate.…”

Section: Introductionmentioning

confidence: 99%

A validated CFD model of plain and serrated fin-tube bundles

Lindqvist

Næss

2018

Applied Thermal Engineering

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This work presents a Computational Fluid Dynamics model of helically wound fin tube bundles and demonstrates its predictive capability for thermal-hydraulic performance. A consistent validation against experimental data is given for four different fin tube geometries, two with plain fins and two with serrated fins. Predicted heat transfer and pressure drop data are within, or very close to, the experimental uncertainty, with maximum root mean square errors of 13.8 % and 14.4 % respectively. The modeled fin temperature distribution is used to evaluate three fin efficiency models, revealing that correction equations can be in significant error for tall plain fins. Three sets of semi-empirical correlations for Nusselt and Euler numbers are also evaluated, showing non-conservative predictions for several of the tested geometries. Results from the study confirm the efficacy of reduced domain modeling, whereby geometric periodicity of the heat exchanger array is exploited to reduce computational cost.

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Numerical Analysis of Turbulent Flow in a Small Helically Segmented Finned Tube Bank

Cited by 13 publications

References 12 publications

A review on the modification of circular fin and tube heat exchangers through new innovative fin shapes

A review on the modification of circular fin and tube heat exchangers through new innovative fin shapes

Numerical modelling of fin side heat transfer and pressure loss for compact heat recovery steam generators

A validated CFD model of plain and serrated fin-tube bundles

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