Impact of a Control Rod on the Heat Transfer Enhancement of a Wall Jet

Document Type : Research Article


Faculty of Mechanical Engineering, University of Tabriz, Tabriz, Iran


Influence of a control rod on the heat transfer characteristics of an incompressible wall jet with an isothermal plate boundary condition is investigated numerically in the turbulent regime. The main issue is to find an efficient way to increase the rate of convective heat transfer in the wall jet. The rod is placed in various horizontal and vertical locations. In addition, different diameters for the rod  are examined. The performance of realizable K-ϵ, standard K-ω, and shear stress transport turbulence models are compared with the experimental data to find the suitable one for the simulations. It was found that the shear stress transport model generates more accurate results than the others. The control rod with a particular diameter and location causes a noticeable enhancement in the heat transfer rate with a negligible increase in the skin friction coefficient. The results showed that the effect of the rod on the heat transfer enhancement increases with the Reynolds number. Two correlations were found as the variation of average Nusselt number and Stanton number against the Reynolds number, which could be used in designs and practices.


Main Subjects

[1]  K. Javadi, M. Hajipour, Separation control using quasi- radial wall jets, aerospace science and technology, 68 (2017) 240-251.
[2]  F.B. Hsiao, S.S. Sheu, Experimental studies on flow transition of a plane wall jet, The Aeronautical Journal, 100(999) (1996) 373-380.
[3]  M. Turkyilmazoglu, Laminar slip wall jet of Glauert type and heat transfer, International Journal of Heat Mass Transfer, 134 (2019) 1153-1158.
[4]  R.S. AbdulNour, K. Willenborg, J.J. McGrath, J.F. Foss, B.S. AbdulNour, Measurements of the convection heat transfer coefficient for a planar wall jet: uniform temperature and uniform heat flux boundary conditions, Experimental Thermal and Fluid Science, 22(3-4) (2000) 123-131.
[5]  Z. Tang, D.J. Bergstrom, J.D. Bugg, A plane turbulent wall jet on a fully rough surface, International Journal of Heat and Fluid Flow, 66 (2017) 258-264.
[6]  A. Shojaeizadeh, M.R. Safaei, A.A. Alrashed, M. Ghodsian, M. Geza, M.A. Abbassi, Bed roughness effects on characteristics of turbulent confined wall jets, Measurement, 122 (2018) 325-338.
[7]  M. S. Pour, S. A. G. Nassab, Numerical investigation  of forced laminar convection flow of nanofluids over a backward facing step under bleeding condition, Journal of Mechanics, 28(2) (2012) N7-N12.
[8]  S.K. Rathore, M.K. Das, A comparative study of heat transfer characteristics of wall-bounded jets using different turbulence models, International Journal of Thermal Sciences, 89 (2015) 337-356.
[9]  A. Kumar, Mean flow characteristics of a turbulent dual jet consisting of a plane wall jet and a parallel offset jet, Computers & Fluids, 114 (2015) 48-65.
[10] N. Hnaien, S. Marzouk, H.B. Aissia, J. Jay, Wall inclination effect in heat transfer characteristics of a combined wall and offset jet flow, International Journal of Heat and Fluid Flow, 64 (2017) 66-78.
[11]  I.Z. Naqavi, J.C. Tyacke, P.G. Tucker, A numerical study of a plane wall jet with heat transfer, International Journal of Heat and Fluid Flow, 63 (2017) 99-107.
[12] S. Mochizuki, S. Yamada, H. Osaka, Management of  a plane turbulent wall jet by the large-eddy break-up device, JSME International Journal Series B Fluids and Thermal Engineering, 49(4) (2006) 921-927.
[13]  L. Chen, R.G. Brakmann, B. Weigand, J. Rodriguez, M. Crawford, R. Poser, Experimental and numerical heat transfer investigation of an impingement jet array with V-ribs on the target plate and on the impingement plate, International Journal of Heat and Fluid Flow, 68 (2017) 126-138.
[14] H. Gu, M. Yao, P. Zhao, X. Li, M. Liu, Numerical simulation of manipulated flow and heat transfer over surface-mounted rib, International Journal of Thermal Sciences, 129 (2018) 124-134.
[15] Q. Jing, D. Zhang, Y.  Xie, Numerical investigations  of impingement cooling performance on flat and non- flat targets with dimple/protrusion and triangular rib, International Journal of Heat and Mass Transfer, 126 (2018) 169-190.
[16] T.H. Shih, W.W. Liou, A. Shabbir, Z. Yang, J. Zhu, A new k-ϵ eddy viscosity model for high reynolds number turbulent flows, Computers & Fluids, 24(3) (1995) 227- 238.
[17] D.C. Wilcox, Turbulence modeling for CFD, DCW industries La Canada, CA, 1998.
[18] F.R. Menter, Improved two-equation k-turbulence models for aerodynamic flows, NASA technical memorandum, 103975(1) (1992).
[19] F.R. Menter, Review of the shear-stress transport turbulence model experience from an industrial perspective, International Journal of Computational Fluid Dynamics, 23(4) (2009) 305-316.
[20] W.H. Schwarz, B. Caswell, Some heat transfer characteristics of the two-dimensional laminar incompressible wall jet, Chemical Engineering Science, 16(3-4) (1961) 338-351.
[21] J. Van Doormaal, G.D. Raithby, Enhancements of the SIMPLE method for predicting incompressible fluid flows, Numerical heat transfer, 7(2) (1984) 147-163.