Numerical simulation of turbulent air flow on a single isolated finned tube module with periodic boundary conditions

Martínez, E.; Vicente, W.; Salinas-Vázquez, M.; Carvajal, Ignacio; Álvarez, Miguel Ángel Leandro Sánchez

doi:10.1016/j.ijthermalsci.2015.01.024

Cited by 30 publications

(10 citation statements)

References 20 publications

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“…The slope of the actual pressure curve, taken between two points spaced one tube row apart, matches well with the average pressure curve after the first tube row. This confirms earlier indications that the reduced model is representative of the full tube model after (at least) the third tube row [18] and that a data reduction method using mass averaged pressure planes to compute the Euler number is acceptable.…”

Section: Full Domain Versus Reduced Domain Modelsupporting

confidence: 88%

“…The numerical modeling approach in this paper is based on simulating a periodic "unit cell" in the heat exchanger array, building on the work of Martinez et al [18] (cf. Figure 3).…”

Section: Numerical Modelmentioning

confidence: 99%

“…Martinez et al [18] presented a modeling approach where a small section of a finned tube bank is simulated with fully periodic boundary conditions. Nusselt numbers and friction factors were compared with two correlations with satisfactory agreement.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Full Domain Versus Reduced Domain Modelsupporting

confidence: 88%

“…The numerical modeling approach in this paper is based on simulating a periodic "unit cell" in the heat exchanger array, building on the work of Martinez et al [18] (cf. Figure 3).…”

Section: Numerical Modelmentioning

confidence: 99%

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

Lindqvist

Næss

2018

Applied Thermal Engineering

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“…Reynolds-averaged Navier-Stokes (RANS) based RNG k-ε model, that is the two-equation turbulence model, is used to analyze the complicated flow motion inside the finned-tube heat exchanger [20]. The RNG k-ε model has been used to capture the complex flow and adverse pressure gradients of the finned-tube heat exchanger [16,18].…”

Section: Mathematical Representationmentioning

confidence: 99%

“…Nuntaphan et al [15] conducted experiments at low Reynolds number on the air-side with crimped fins and suggested the correlation for the Colburn j-factor and friction factor. Martinez et al [16] performed a numerical simulation to examine the flow and pressure drop characteristics of serrated fins. They showed the turbulent kinetic energy to compare the flow interaction through the finned-tube, and the high temperature and pressure gradient appeared at the location of large turbulent kinetic energy.…”

Section: Introductionmentioning

confidence: 99%

Influence of Perforated Fin on Flow Characteristics and Thermal Performance in Spiral Finned-Tube Heat Exchanger

2019

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The present study conducts the numerical investigation of flow characteristics and thermal performance of spiral finned-tube heat exchangers. The effects of location of perforations (90°, 120°, and 150°) on heat transfer and pressure drop are analyzed for the air-side. The commercial computational fluid dynamics code ANSYS Fluent (V.17.0) is used for simulations with the RNG k-ε model based on the Reynolds-averaged Navier–Stokes equations. The velocity field, Colburn j-factor, and friction factor are analyzed to evaluate the heat transfer and pressure drop characteristics. Because of the flow through the perforations, the boundary layers on the fin surfaces are interrupted. This results in increased flow disturbances close to the fin, and the heat transfer performance increases compared to the reference case. The pressure drop, which is one of the disadvantages of spiral finned tubes comparing to plate or circular fins, decreases with perforations on the fin. Overall, the cases with perforated fin exhibit greater performance of area goodness factor considering the relationship between the heat transfer and the pressure drop.

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