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Abstract
A numerical study on in-line arrays of multiple turbulent round impinging jets on a flat heated plate was conducted. The Large Eddy Simulation turbulence model was used to capture details of the instantaneous and mean flow fields. The Reynolds number, based on the jets diameter, was equal to 20,000. In addition to flow features known from single jets, the interaction between the neighboring jets was successfully elucidated. Symmetry boundary conditions were imposed to reduce the computational domain to only a quarter. In accordance with previous numerical and experimental works, the asymmetry in the velocity field near to the impingement plate was also found to exist. LES showed oval imprints of the Nusselt number similar to experiments but with some discrepancies on the symmetry boundaries. The asymmetry, observed in previous experimental and numerical results, in the horizontal planes, parallel and close to the impingement wall, was confirmed. The recirculation zone responsible for asymmetry, known to develop due to the wall jets interaction, was seen in only one side of the diagonal formed by the central and the farthest jets.
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References
- Garimella SV, Schroeder VP (2001), Local heat transfer distributions in confined multiple air jet impingement. ASME Journal of Electronic Packaging 123(3):165-172.
- Geers L, Hanjalic K, Tummers M (2006), Wall imprints of turbulent structure and heat transfer in multiple impinging jet arrays. J. Fluid Mech. 546:255-284.
- Germano M, Piomelli U, Moin P, Cabot WH (1991), A dynamic subgrid-scale eddy viscosity model. Physics of Fluids 3:1760-1765.
- Hadžiabdic M, Hanjalic K (2008), Vortical structures and heat transfer in a round impinging jet. J. Fluid Mech. 596:221-260.
- Kraichnan R (1970), Diffusion by a random velocity field. Physics of Fluids 11:21-31.
- Lilly DK (1992), A proposed modification of the germano subgrid-scale closure model. Physics of Fluids 4:633-635.
- Menter FR (1994), Two-equation eddy-viscosity turbulence models for engineering applications. AIAA Journal 32:69-289.
- Smirnov R, Shi S, Celik I (2001), Random flow generation technique for large rddy simulations and particle-dynamics modeling. J. Fluids Eng. 123:359-371.
- Spring S, Lauffer D, Weigand B, Hase M (2010), Experimental and numerical investigation of impingement cooling in a combustor liner heat shield. ASME J. Turbomach 132:011003.
- Thielen L, Hanjalic K, Jonker H, Manceau R (2005), Predictions of flow and heat transfer in multiple impinging jets with an elliptic-blending secondmoment closure. Int. J. Heat and Mass Transfer 48(8):1583-1598.
- Thielen L, Jonker H, Hanjalic K (2003), Symmetry breaking of flow and heat transfer in multiple impinging jets. Int. J. Heat Fluid Flow 24(4):444-453.
- Xing Y, Spring S, Weigand B (2010), Experimental and numerical investigation of heat transfer characteristics of inline and staggered arrays of impinging jets. J. heat transfer 132:092201.
- Yokobori S, Kasagi N, Hirata M (1977), Characteristic behaviour of turbulence in the stagnation region of a two-dimensional submerged jet impinging normally on a flat plate. First Int. Symp. Turbulent Shear Flows, University Park, Penn, USA.
References
Garimella SV, Schroeder VP (2001), Local heat transfer distributions in confined multiple air jet impingement. ASME Journal of Electronic Packaging 123(3):165-172.
Geers L, Hanjalic K, Tummers M (2006), Wall imprints of turbulent structure and heat transfer in multiple impinging jet arrays. J. Fluid Mech. 546:255-284.
Germano M, Piomelli U, Moin P, Cabot WH (1991), A dynamic subgrid-scale eddy viscosity model. Physics of Fluids 3:1760-1765.
Hadžiabdic M, Hanjalic K (2008), Vortical structures and heat transfer in a round impinging jet. J. Fluid Mech. 596:221-260.
Kraichnan R (1970), Diffusion by a random velocity field. Physics of Fluids 11:21-31.
Lilly DK (1992), A proposed modification of the germano subgrid-scale closure model. Physics of Fluids 4:633-635.
Menter FR (1994), Two-equation eddy-viscosity turbulence models for engineering applications. AIAA Journal 32:69-289.
Smirnov R, Shi S, Celik I (2001), Random flow generation technique for large rddy simulations and particle-dynamics modeling. J. Fluids Eng. 123:359-371.
Spring S, Lauffer D, Weigand B, Hase M (2010), Experimental and numerical investigation of impingement cooling in a combustor liner heat shield. ASME J. Turbomach 132:011003.
Thielen L, Hanjalic K, Jonker H, Manceau R (2005), Predictions of flow and heat transfer in multiple impinging jets with an elliptic-blending secondmoment closure. Int. J. Heat and Mass Transfer 48(8):1583-1598.
Thielen L, Jonker H, Hanjalic K (2003), Symmetry breaking of flow and heat transfer in multiple impinging jets. Int. J. Heat Fluid Flow 24(4):444-453.
Xing Y, Spring S, Weigand B (2010), Experimental and numerical investigation of heat transfer characteristics of inline and staggered arrays of impinging jets. J. heat transfer 132:092201.
Yokobori S, Kasagi N, Hirata M (1977), Characteristic behaviour of turbulence in the stagnation region of a two-dimensional submerged jet impinging normally on a flat plate. First Int. Symp. Turbulent Shear Flows, University Park, Penn, USA.