Numerical study of transient conjugate heat transfer of a turbulent impinging jet

Abstract This study presents the numerical study of transient conjugate heat transfer in a high turbulence air jet impinging over a flat circular disk. The numerical simulation of transient, two-dimensional cylindrical coordinate, turbulent flow and heat transfer is adopted to test the accuracy of the theoretical model. The turbulent governing equations are resolved by the control-volume based finite-difference method with a power-low scheme, and the well-known low-Re κ–ω turbulence model to describe the turbulent structure. The SIMPLE algorithm is adopted to solve the pressure–velocity coupling. The parameters studied include turbulent flow Reynolds number (Re = 16,100–29,600), heated temperature of a circular disk (Th = 373 K) or heat flux (q″ = 63–189 kW/m2), and orifice to heat-source spacing (H/D = 4–10). The numerical results of the transient impinging process indicate that the jet Reynolds number has a significant effect on the hydrodynamics and heat transfer, particularly in the stagnation region of an impinging jet. High turbulence values lead to greater heat transfer coefficients in the stagnation region and cause a bypass of the laminar-to-turbulent transition region in the wall jet region. Induced turbulence from the environment around the jet also influences the variation of the stagnation heat transfer. The modeling approach used here effectively captures both the stagnation region behavior and the transition to turbulence, thus forming the basis of a reliable turbulence model.

[1]  S. H. Seyedein,et al.  Modelling of a single confined turbulent slot jet impingement using various k — ϵ turbulence models , 1994 .

[2]  G. Singh ENTRAINMENT AND MIXING STUDIES FOR A VARIABLE DENSITY CONFINED JET , 1999 .

[3]  A. Mohamad,et al.  Three-Dimensional Simulation of Laminar Rectangular Impinging Jets, Flow Structure, and Heat Transfer , 1999 .

[4]  Simulation and measurement of flow and heat transfer in two planar impinging jets , 2005 .

[5]  P. R. Voke,et al.  Numerical study of heat transfer from an impinging jet , 1998 .

[6]  M. Coussirat,et al.  Computational Fluid Dynamics Modeling of Impinging Gas-Jet Systems: I. Assessment of Eddy Viscosity Models , 2005 .

[7]  M. Delichatsios,et al.  NEW EVALUATION OF THE K-ε TURBULENCE MODEL FORFREE BUOYANT PLUMES , 2003 .

[8]  C. Y. Soong,et al.  NUMERICAL INVESTIGATION OF HEAT TRANSFER UNDER CONFINED IMPINGING TURBULENT SLOT JETS , 1999 .

[9]  Madhumita B. Ray,et al.  HEAT TRANSFER IN MULTIPLE-TURBULENT-SLOT IMPINGING JETS OF GAS–PARTICLE SUSPENSIONS , 2004 .

[10]  Muhammad M. Rahman,et al.  NUMERICAL MODELING OF CONJUGATE HEAT TRANSFER DURING IMPINGEMENT OF FREE LIQUID JET ISSUING FROM A SLOT NOZZLE , 2000 .

[11]  Gwang Hoon Rhee,et al.  ENHANCEMENT OF HEAT TRANSFER IN TURBULENT SEPARATED AND REATTACHING FLOW BY LOCAL FORCING , 2000 .

[12]  J. Niu,et al.  NUMERICAL SIMULATION AND EXPERIMENTAL VALIDATION OF THE SWIRLING TURBULENT AIR FLOW AND MIXING PROCESSES , 2004 .

[13]  Masud Behnia,et al.  Numerical study of turbulent heat transfer in confined and unconfined impinging jets , 1999 .

[14]  Jian Zhang,et al.  A NEW ALGEBRAIC MASS FLUX MODEL FOR SIMULATING TURBULENT MIXING IN SWIRLING FLOW , 2004 .

[15]  H. Martin Heat and Mass Transfer between Impinging Gas Jets and Solid Surfaces , 1977 .

[16]  Chongfang Ma,et al.  Theoretical study on impingement heat transfer with single-phase free-surface slot jets , 2005 .

[17]  Samir Armando Salamah,et al.  Modeling of Turbulent Heat Transfer from an Array of Submerged Jets Impinging on a Solid Surface , 2005 .

[18]  Yue-Tzu Yang,et al.  NUMERICAL STUDY OF MULTIPLE IMPINGING SLOT JETS WITH AN INCLINED CONFINEMENT SURFACE , 1998 .

[19]  Subrata Roy,et al.  NUMERICAL INVESTIGATION OF THE BLADE COOLING EFFECT GENERATED BY MULTIPLE JETS ISSUING AT AN ANGLE INTO AN INCOMPRESSIBLE HORIZONTAL CROSSFLOW , 2000 .

[20]  Dennis N. Assanis,et al.  COMPARISON OF LINEAR AND NONLINEAR RNG-BASED k-epsilon MODELS FOR INCOMPRESSIBLE TURBULENT FLOWS , 1999 .

[21]  NUMERICAL INVESTIGATION OF JET IMPINGEMENT WITH CROSS FLOW—COMPARISON OF YANG-SHIH AND STANDARD k–ϵ TURBULENCE MODELS , 2005 .

[22]  S. H. Seyedein,et al.  TURBULENT FLOW AND HEAT TRANSFER FROM CONFINED MULTIPLE IMPINGING SLOT JETS , 1995 .

[23]  K. T. Harris,et al.  Heat Transfer in a High Turbulence Air Jet Impinging Over a Flat Circular Disk , 2003 .

[24]  Wei Shyy,et al.  A COMPUTATIONAL AND EXPERIMENTAL INVESTIGATION OF TURBULENT JET AND CROSSFLOW INTERACTION , 2000 .

[25]  Muhammad M. Rahman,et al.  Analysis of Transient Conjugate Heat Transfer to a Free Impinging Jet , 2000 .

[26]  Y. H. Hung,et al.  Fluid flow and heat transfer of an extended slot jet impingement , 1994 .

[27]  Farzad Mashayek,et al.  A FOUR-EQUATION MODEL FOR PREDICTION OF GAS-SOLID TURBULENT FLOWS , 2002 .

[28]  Michael Spearpoint,et al.  Modeling Lifted Methane Jet Fires Using the Boundary-Layer Equations , 2006 .

[29]  Andreas Abdon, Bengt Sundén,et al.  NUMERICAL INVESTIGATION OF IMPINGEMENT HEAT TRANSFER USING LINEAR AND NONLINEAR TWO-EQUATION TURBULENCE MODELS , 2001 .

[30]  Yue-Tzu Yang,et al.  NUMERICAL SIMULATIONS ON THE HYDRODYNAMICS OF A TURBULENT SLOT JET IMPINGING ON A SEMICYLINDRICAL CONVEX SURFACE , 2004 .

[31]  Nimai Kumar Mitra,et al.  Large-eddy simulation of heat transfer from impinging slot jets , 1997 .

[32]  Hirofumi Hattori,et al.  Direct Numerical Simulation of Turbulent Heat Transfer in Plane Impinging Jet , 2004 .

[33]  Tim Craft,et al.  A NEW WALL FUNCTION STRATEGY FOR COMPLEX TURBULENT FLOWS , 2004 .

[34]  A. Dewan,et al.  PREDICTION OF TURBULENT PLANE JET IN CROSSFLOW , 2002 .

[35]  Xiaodong Yang,et al.  LINEAR AND NONLINEAR EDDY-VISCOSITY TURBULENCE MODELS FOR A CONFINED SWIRLING COAXIAL JET , 2003 .

[36]  Y. H. Hung,et al.  Impingement Cooling of an Isothermally Heated Surface With a Confined Slot Jet , 1994 .

[37]  Wei-Zhen Lu,et al.  NUMERICAL INVESTIGATION OF CONVECTION HEAT TRANSFER IN A HEATED ROOM , 2002 .

[38]  A computational method for generating the free-surface neck-down profile for glass flow in optical fiber drawing , 1999 .

[39]  Yue-Tzu Yang,et al.  Three-dimensional numerical simulation of an inclined jet with cross-flow , 2005 .

[40]  M. O. Budair,et al.  JET IMPINGEMENT ONTO A HOLE WITH CONSTANT WALL TEMPERATURE , 2003 .

[41]  S. Parameswaran,et al.  Application of a Novel Moving-Grid Methodology to Model the Interaction of a Synthetic Jet with a Turbulent Boundary Layer , 2006 .

[42]  S. Patankar Numerical Heat Transfer and Fluid Flow , 2018, Lecture Notes in Mechanical Engineering.

[43]  Gautam Biswas,et al.  NUMERICAL INVESTIGATION OF HEAT TRANSFER BY ROWS OF RECTANGULAR IMPINGING JETS , 1996 .

[44]  A. Mujumdar,et al.  Computational Study of Impingement Heat Transfer under a Turbulent Slot Jet , 2002 .