Simulation of Convective Heat Transfer in 3D Forward Facing Step Using Various Turbulence Models
DOI:
https://doi.org/10.5614/j.eng.technol.sci.2020.52.5.2Keywords:
forward facing step, heat transfer, k-epsilon, k-omega, k-omega SST, v2-f, turbulence model, pisoTempFoam, OpenFOAMAbstract
In this work, a modified solver from the OpenFOAM 4.1 software was used to study the fluid flow and heat transfer characteristics over a forward facing step (FFS) considering various turbulence models, viz., k-ε, k-, k- SST and v2-f. Numerical computations were performed using a newly developed transient solver, pisoTempFoam. Modeling and meshing of the geometry and setting of the boundary conditions were done with OpenFOAM. The bottom (upstream, step and downstream) walls were heated at a constant temperature of 350K, while the fluid inlet temperature was 298K. The simulation results were compared with those available in the literature. Variation of skin friction coefficient (Cf), coefficient of pressure (Cp), and Nusselt number (Nu) for different Reynolds numbers (Re), contraction ratios (CR) and different fluids are presented. This article also presents information about recirculation bubbles in the upstream and downstream regions of the FFS. The results show that the combined effect of turbulence models and parameters, such as CR, Re and Pr, change the flow and heat transfer characteristics of the FFS. The present CFD simulation plays a pivotal role in the analysis of flow over airfoils at a large angle of attack in heat exchangers and pipes whose area suddenly changes.Downloads
References
Vogel, J.G. & Eaton, J.K., Combined Heat Transfer and Fluid Dynamic Measurements Downstream of a Backward-Facing Step, Transactions of the ASME, Journal of Heat Transfer, 107, pp. 922-928, 1985.
Jayakumar, J.S., Kumar, I. & Eswaran, V., Hybrid Mesh Finite Volume CFD Code for Studying Heat Transfer in A Forward-Facing Step, Physica Scripta. 142, 014060, pp. 1-11, 2010.
Sajesh, P. & Jayakumar, J.S., Effect of Streamline Curvature on Heat Transfer in Turbulent Flow over Backward Facing Step, 3rd International Conference on Advances in Materials and Manufacturing Applications (IConAMMA 2018), 16th - 18th August 2018.
Vijay, A., Nitish,C.N., Subash, A., Raj,S., Kumar S.,A. &Jayakumar, J.S., Numerical Simulation on Flow over a Double Forward Facing Step, AIP Conference Proceedings, 2134, 040004, pp. 1-6, 2019. DOI: 10.1063/1.5120212.
Hussein, T., Ahmadi, G., Tuqa, A., Ahmed, J.S., Kazi, S.N., Badarudin, A. & Safaei, M.R., Thermal Performance of Nanofluid In Ducts with Double Forward-Facing Steps, Journal of the Taiwan Institute of Chemical Engineers, 47, pp. 28-42, 2015. DOI: 10.1016/ j.jtice.2014.10.009
Safaei, M.R., Hussein Togun., Vafai, K., Kazi, S.N. & Badarudin, A., Investigation of Heat Transfer Enhancement in a Forward-Facing Contracting Channel Using FMWCNT Nanofluids, Numerical Heat Transfer, Part A: Applications: An International Journal of Computation and Methodology, 66, pp. 1321-1340, 2014. DOI: 10.1080/ 10407782.2014.916101.
Alrashed, A.A.A.A., Akbari, O.A., Heydari, A., Toghraie, D., Zarringhalam, M., Shabani, G.A.S., Seifi, A.R. & Goodarzi, M., The Numerical Modeling of Water/FMWCNT Nanofluid Flow and Heat Transfer in a Backward-facing Contracting Channel, Physica B: Physics of Condensed Matter, 537, pp. 176-183, 2018.
Kherbeet, A. S., Mohammed, H.A., Hamdi, E. A., Salmand, B.H., Omer, A.A., Mohammad, R.S. & Khazaal, M.T., Mixed Convection Nanofluid Flow over Microscale Forward-Facing Step - Effect of Inclination and Step Heights, International Communications in Heat and Mass Transfer, 78, pp. 145-154, 2016. DOI: 10.1016/j.icheatmasstransfer.2016.08.016.
Eka, O.N. & Syunsuke, I., Comparison Study of Flow in a Compound Channel: Experimental and Numerical Method Using Large Eddy Simulation SDS-2DH Model, ITB Journal of Engineering Sciences, 39, pp. 67-97, 2007. DOI: 10.5614/itbj.eng.sci.2007.39.2.1.
Kusuma, M.S.B., Rani, A., Anom, R. & Cahyono, M., Development Study of Turbulent k- Model for Recirculation Flow III: Two Dimension Recirculation Flow in a Reservoir, ITB Journal of Engineering Science, 41, pp. 1-16, 2009. DOI: 10.5614/ itbj.eng.sci.2009.41.1.1.
Li, Z.Y., Guo, S., Bai, H.L. & Gao, N., Combined Flow and Heat Transfer Measurements of Backward Facing Step Flows Under Periodic Perturbation, International Journal of Heat and Mass Transfer, 130, pp. 240-251, 2019.
Ali, K.H., Abd Rahim, A.T., Antonio, A.I., Mohammed, T.H.S. & Mohd Faisal, A.H., Effect of Corrugated Wall Combined with Backward-Facing Step Channel on Fluid Flow and Heat Transfer, Energy, 190, pp. 1-10, 2020. DOI: 10.1016/j.energy.2019.116294.
Greenshields, C.J., OpenFOAM User Guide, Version 4.1, 2017.
Greenshields, C.J., OpenFOAM Programmer's Guide, Version 4.1, 2017.
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