Simulation of Jet Impingement Heat Transfer

ABSTRACT A numerical investigation to determine flow and thermalcharacteristics of an unsubmerged axisymmetric oil jet impinging on aconfined flat surface with uniform heat flux has been undertaken.Large impingement length to nozzle diameter ratios were chosen in thesimulations. The volume of fluid (VOF) method utilizing a HighResolution Interface Capturing scheme (HRIC) was used to performthe two-phase (air-oil) simulations. The governing 3D Navier-Stokesequations and energy equation were numerically solved using a finitevolume discretization on an unstructured mesh. A new methodologywas developed to define the radial extent of the stagnation region andunderstand the variation of the heat transfer coefficient in this region.The normalized local Nusselt number profile was found to be slightlydependent on Reynolds number for a given nozzle size. Correlations topredict the dimensionless velocity gradient and the Nusselt number inthe stagnation region were established. NOMENCLATURE B Dimensionless velocity gradient

[1]  M. Miyamoto,et al.  Effects of axial heat conduction in a vertical flat plate on free convection heat transfer , 1980 .

[2]  M. Lupo,et al.  The coupling of conduction with laminar natural convection along a flat plate , 1988 .

[3]  Z. Dagan,et al.  Heat transfer between a circular free impinging jet and a solid surface with non-uniform wall temperature or wall heat flux—1. Solution for the stagnation region , 1989 .

[4]  John H. Lienhard,et al.  Convective Heat Transfer by Impingement of Circular Liquid Jets , 1991 .

[5]  B. W. Webb,et al.  Local Heat Transfer Coefficients Under an Axisymmetric, Single-Phase Liquid Jet , 1991 .

[6]  F. Menter.  Improved two-equation k-omega turbulence models for aerodynamic flows , 1992 .

[7]  B. W. Webb,et al.  Effect of nozzle configuration on transport in the stagnation zone of axisymmetric, impinging free-surface liquid jets: Part 1-turbulent flow structure , 1992 .

[8]  M. Vynnycky,et al.  Conjugate free convection due to a heated vertical plate , 1996 .

[9]  S. Ashforth-Frost,et al.  Velocity and Turbulence Characteristics of a Semiconfined Orthogonally Impinging Slot Jet , 1997 .

[10]  Masud Behnia,et al.  Prediction of heat transfer in an axisymmetric turbulent jet impinging on a flat plate , 1998 .

[11]  Conjugate heat transfer during free jet impingement of a high Prandtl number fluid , 1999 .

[12]  T. Kunugi,et al.  Movement of impingement heat transfer by a single circular jet with a confined wall , 2001 .

[13]  Chong-fang Ma.  Impingement Heat Transfer with Meso-scale Fluid Jets , 2002 .

[14]  Noam Lior,et al.  Jet Impingement Heat Transfer: Physics, Correlations, and Numerical Modeling , 2006 .

[15]  Mohamed S. Gadala,et al.  Heat transfer behavior in the impingement zone under circular water jet , 2006 .

[16]  B. Hewakandamby.  A numerical study of heat transfer performance of oscillatory impinging jets , 2009 .