An improved algebraic model for bypass transition for calculation of transitional flow in parallel-plate channel

Nering, Konrad; Rup, Kazimierz

doi:10.1016/j.ijthermalsci.2018.09.038

Cited by 4 publications

(9 citation statements)

References 8 publications

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“…These equations represent the mass and momentum balance. Balance equation system includes the continuity equation and Reynolds-averaged Navier-Stokes equations (RANS) [16]:…”

Section: Governing Equationsmentioning

confidence: 99%

“…This model introduce factor γ which is a multiplier of the production term in the k-equation. As shown in [15,16,20,26] it enables more accurate description of the flow in the laminar, transitional, and turbulent range. The k and ω equations are defined:…”

Section: Governing Equationsmentioning

confidence: 99%

“…The comparisons shows that for transitional flow the best result are obtained with k − ωSST and V-SA model. Recently, for the transitional flow was proposed modified model based on standard k − ω [15][16][17]. The model proposed in [15] was originally developed for turbomachinery, the model from [17] is for flow around airfoils.…”

Section: Introductionmentioning

confidence: 99%

“…The model proposed in [15] was originally developed for turbomachinery, the model from [17] is for flow around airfoils. Only model proposed in [16] which is a modification of [15] model can be applied for internal duct flow, however it was validated only with literature data, not in particular for HVAC ducts. Therefore, in this paper, a validation of this model is performed using PTV measurement method.…”

Section: Introductionmentioning

confidence: 99%

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Validation of Modified Algebraic Model during Transitional Flow in HVAC Duct

Nering

2021

Energies

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Airflow occurring in a ventilation duct is characterized by low velocity and hence low Reynolds number. In these conditions, either a laminar, transitional or turbulent flow will occur. Different flow conditions result in different values of the friction coefficient. To achieve the transitional flow in numerical simulation, a modified algebraic model for bypass transition (modified k−ω) was used. Numerical simulation was validated using Particle Tracking Velocimetry (PTV) in the circular channel. The modified algebraic model consists of only two partial differential equations, which leads to much faster calculation than the shear stress transport model. Results of the modified algebraic model are largely consistent with either the measurement and shear stress transport model considering laminar and transitional flow. Consistency slightly decreased in turbulent flow in relation to the model using shear stress transport method.

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“…These equations represent the mass and momentum balance. Balance equation system includes the continuity equation and Reynolds-averaged Navier-Stokes equations (RANS) [16]:…”

Section: Governing Equationsmentioning

confidence: 99%

Section: Governing Equationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Validation of Modified Algebraic Model during Transitional Flow in HVAC Duct

Nering

2021

Energies

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“…Nering and Rup in [12] a comparison with measurement and analysis of velocity profiles for improved model were presented. Results obtained with modified model show high degree of compliance with experimental data.…”

Section: Introductionmentioning

confidence: 99%

An improved algebraic model for by-pass transition for calculation of transitional flow in pipe and parallel-plate channels

Nering

Rup

2019

THERM SCI

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Original scientific paper https://doi.org/10.2298/TSCI19S4123N Modified algebraic intermittency model developed by E. Dick and S. Kubacki was used to describe laminar-turbulent transition. In this work a modification of this model was made for simulating internal flows in pipes and parallel-plate channel. In particular, constants present in this model were modified. These modified constants are the same for different flows in pipes and parallel-plate channels. In this work, a dependence of friction factor on Reynolds number and turbulence intensity were determined as well as the localization of laminar breakdown and fully developed flow. Obtained results were compared with theoretical and experimental data presented in the literature.

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