Effect of Turbulence Models and Near-Wall Modeling Approaches on Numerical Results in Impingement Heat Transfer

Pulat, Erhan; Isman, Mustafa Kemal; Etemoğlu, Akın Burak; Can, Muhiddin

doi:10.1080/10407790.2011.630956

Cited by 28 publications

(11 citation statements)

References 58 publications

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“…Recently, Sagot et al [74] considered two k-ε and two k-ω models for non-swirling impinging jet heat transfer and found that SST k-ω agrees well with their experimental data, in agreement with [77]. Although the standard k-ε model has been found to be inaccurate in the past in predicting stagnation region heat transfer, interestingly, a recent work [72] reported significant improvement with standard k-ε models if combined with a two-layer model of enhanced wall treatment. In summary, even though very little work has been done on characterising the effects of different modelling approaches when applied to swirling impinging jets, the diversity of works already done on other flow configurations also makes it hard to anticipate the sensitivity of specific models when applied to turbulent impinging jets.…”

Section: Introductionsupporting

confidence: 60%

The effect of inflow conditions on the development of non-swirling versus swirling impinging turbulent jets

2015

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Section: Introductionsupporting

confidence: 60%

The effect of inflow conditions on the development of non-swirling versus swirling impinging turbulent jets

2015

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“…(4) RNG K-ε turbulence model is applied for this investigation. Pulat et al [10] and Heck et al [11] reported that this model reflects the basic features of the jet flow. The conservation equations for the turbulent kinetic energy k and the dissipation rate ε are: Kinetic energy, k…”

Section: Governing Equations Gas Phasementioning

confidence: 90%

“…Gk represents the turbulence kinetic energy due to the mean velocity gradients. The constants of this model are recommended by Pulat et al[10]: Cµ = 0.09, Cε1 = 1.42, Cε2 = 1.68, = 1.393, = 4.38 and β= 0.012…”

mentioning

confidence: 99%

Effect of sand particles on flow structure of free jet from a nozzle

Al-Dulaimi

Hamad

Rasool

et al. 2019

JMES

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The Characteristics of single and two- phase flow from a circular turbulent free jet from a nozzle of 10 mm diameter were investigated experimentally and numerically. The measurements were conducted for ReJ = 10007 - 31561. The velocity was measured at location from the nozzle y/D (0-8) in axial and radial directions. The two phase measurement were done by using natural construction sand as a solid phase of sizes (220,350,550) µm and loading ratios (mass flow ratio of sand to mass flow rate of air) in the range (0.18-1.38). Two phase air velocity of jet showed that the introducing of natural sand particles gives lower jet velocity attributed to momentum transfer to particles. The smaller particle size leads to lower values of velocity. The velocity found to be decreased with loading ratio increase. The numerical simulation was performed for single and two phase jet flow. RNG K-ε turbulence model was used to simulate the flow of fluid and the discrete phase model to simulate the particles flow. The results form numerical simulation showed a good agreement with experimental results.

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“…

μ_{t} = \frac{ρ C_{μ} k^{2}}{ϵ}

In the present study, the RNG k‐ϵ turbulence model is applied by considering the studies of Pulat et al and Heck et al They found that this model is suitable to simulate the impinging jet flow in stagnation zones and wall jet regions adequately. The equations for turbulent kinetic energy k and dissipation rate ϵ are:…”

Section: Cfd Model and Simulationmentioning

confidence: 99%

Investigation of impingement heat transfer for air‐sand mixture flow

Al-Dulaimi

Rasool

Hamad³

2015

Can J Chem Eng

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Heat transfer between a heated flat plate and normal impinging gas‐solid two‐phase jet flow was investigated. A single jet from a nozzle of 10 mm diameter at nozzle‐to‐plate distance/nozzle diameter ratio in the range of 2–8 was used. Natural sand particles with average diameters of 220, 350, and 550 μm were used as a solid phase. The effects of particle size and loading ratio (mass of sand/mass of air) at different jet velocities on impingement cooling characteristics of the flat plate are investigated. The numerical simulations were performed with ANSYS Fluent 14.7 for a steady, three‐dimensional, incompressible turbulent flow using Eulerian simulation for the gas phase and Lagrangian simulation for sand particles. The experimental results show that the existence of sand particles decreases the Nusselt number compared to air jet flow. The single and two‐phase flow experimental results are close to predictions when the particle reflection option is used in the simulation. The discrepancy in local values near the stagnation point can be attributed to the complex nature of the two‐phase flow at the stagnation point that includes reflection of sand particles at different angles.

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Effect of Turbulence Models and Near-Wall Modeling Approaches on Numerical Results in Impingement Heat Transfer

Cited by 28 publications

References 58 publications

The effect of inflow conditions on the development of non-swirling versus swirling impinging turbulent jets

The effect of inflow conditions on the development of non-swirling versus swirling impinging turbulent jets

Effect of sand particles on flow structure of free jet from a nozzle

Investigation of impingement heat transfer for air‐sand mixture flow

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