Experimental and Numerical Investigation of Heat Transfer Characteristics of Inline and Staggered Arrays of Impinging Jets

A combined experimental and numerical investigation of the heat transfer characteristics within an array of impinging jets has been conducted. The experiments were carried out in a perspex model using a transient liquid crystal method. Local jet temperatures were measured at several positions on the impingement plate to account for an exact evaluation of the heat transfer coefficient. The effects of the variation in different impingement patterns, jet-to-plate spacing, crossflow schemes, and jet Reynolds number on the distribution of the local Nusselt number and the related pressure loss were investigated experimentally. In addition to the measurements, a numerical investigation was conducted. The motivation was to evaluate whether computational fluid dynamics (CFD) can be used as an engineering design tool in the optimization of multijet impingement configurations. This required, as a first step, a validation of the numerical results. For the present configuration, this was achieved assessing the degree of accuracy to which the measured heat transfer rates could be computed. The overall agreement was very good and even local heat transfer coefficients were predicted at high accuracy. The numerical investigation showed that state-of-the-art CFD codes can be used as suitable means in the thermal design process of such configurations.

[1]  Lamyaa A. El-Gabry,et al.  Experimental Investigation of Local Heat Transfer Distribution on Smooth and Roughened Surfaces Under an Array of Angled Impinging Jets , 2001, Heat Transfer: Volume 5 — Computational, Aerospace and Environmental Heat Transfer.

[2]  J. Michael Owen,et al.  Uncertainties in transient heat transfer measurements with liquid crystal , 2002 .

[3]  I. Kurzfassung,et al.  Experimental investigation of heat transfer characteristics from arrays of free impinging circular jets and hole channels , 2005 .

[4]  Bernhard Weigand,et al.  Experimental and Numerical Investigation of Impingement Cooling in a Combustor Liner Heat Shield , 2010 .

[5]  Bernhard Weigand,et al.  Multiple Jet Impingement − A Review , 2011 .

[6]  L. Richardson,et al.  The Deferred Approach to the Limit. Part I. Single Lattice. Part II. Interpenetrating Lattices , 1927 .

[7]  B. L. Button,et al.  A review of heat transfer data for single circular jet impingement , 1992 .

[8]  John David Maltson,et al.  CFD Prediction for Multi-Jet Impingement Heat Transfer , 2009 .

[9]  R J Goldstein,et al.  Jet‐Impingement Heat Transfer in Gas Turbine Systems , 2001, Annals of the New York Academy of Sciences.

[10]  E. Lutum,et al.  Advanced evaluation of transient heat transfer experiments using thermochromic liquid crystals , 2007 .

[11]  Hee-Koo Moon,et al.  Separate Effects of Mach Number and Reynolds Number on Jet Array Impingement Heat Transfer , 2007 .

[12]  T. V. Jones,et al.  Detailed Measurements of Local Heat Transfer Coefficient and Adiabatic Wall Temperature Beneath an Array of Impinging Jets , 1993 .

[13]  D. E. Metzger,et al.  Heat Transfer Characteristics for Inline and Staggered Arrays of Circular Jets with Crossflow of Spent Air , 1979 .

[14]  B. Weigand,et al.  CFD Heat Transfer Predictions of a Single Circular Jet Impinging with Crossflow , 2006 .

[15]  Gary D. Lock,et al.  Transient heat transfer measurements using thermochromic liquid crystal: lateral-conduction error , 2005 .

[16]  G. A. Rao,et al.  Numerical Analysis of a Multiple Jet Impingement System , 2009 .

[17]  Terry V. Jones,et al.  Liquid crystal measurements of heat transfer and surface shear stress , 2000 .

[18]  Geoffrey M. Dailey,et al.  Heat Transfer and Flow Characteristics of an Engine Representative Impingement Cooling System , 2000 .

[19]  F. Menter.  Two-equation eddy-viscosity turbulence models for engineering applications , 1994 .

[20]  A. Mujumdar,et al.  NUMERICAL FLOW AND HEAT TRANSFER UNDER IMPINGING JETS: A REVIEW , 1989 .

[21]  Ricardo Martinez-Botas,et al.  Heat Transfer and Pressure Investigation of Dimple Impingement , 2008 .

[22]  K. Hanjalic,et al.  Heat transfer correlation for hexagonal and in-line arrays of impinging jets , 2008 .

[23]  D. E. Metzger,et al.  Periodic Streamwise Variations of Heat Transfer Coefficients for Inline and Staggered Arrays of Circular Jets with Crossflow of Spent Air , 1980 .

[24]  Anil K. Tolpadi,et al.  Experimental and Numerical Study of Heat Transfer in a Gas Turbine Combustor Liner , 2003 .

[25]  Stephen B. Pope,et al.  An explanation of the turbulent round-jet/plane-jet anomaly , 1978 .

[26]  P. Roache.  Conservatism of the Grid Convergence Index in Finite Volume Computations on Steady-State Fluid Flow and Heat Transfer , 2003 .

[27]  B. R. Hollworth,et al.  Heat Transfer From Arrays of Impinging Jets with Large Jet-to-Jet Spacing , 1978 .

[28]  W. Tabakoff,et al.  Heat Transfer by a Square Array of Round Air Jets Impinging Perpendicular to a Flat Surface Including the Effect of Spent Air , 1970 .

[29]  T. V. Jones,et al.  Comparison and Prediction of Local and Average Heat Transfer Coefficients Under an Array of Inline and Staggered Impinging Jets , 1996 .

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

[31]  R. S. Bunker,et al.  Local Heat Transfer and Flow Distributions for Impinging Jet Arrays of Dense and Sparse Extent , 2002 .

[32]  N. Lior,et al.  Impingement Heat Transfer: Correlations and Numerical Modeling , 2005 .

[33]  Thomas A. Trabold,et al.  Impingement Heat Transfer Within Arrays of Circular Jets: Part 1—Effects of Minimum, Intermediate, and Complete Crossflow for Small and Large Spacings , 1987 .

[34]  S. J. Kline,et al.  Describing Uncertainties in Single-Sample Experiments , 1953 .

[35]  Bernhard Weigand,et al.  The Transient Liquid Crystal Technique: Influence of Surface Curvature and Finite Wall Thickness , 2004 .

[36]  Meherwan P. Boyce,et al.  Gas turbine engineering handbook , 1981 .

[37]  P. Roache.  Perspective: A Method for Uniform Reporting of Grid Refinement Studies , 1994 .

[38]  J. Whitelaw,et al.  Convective heat and mass transfer , 1966 .

[39]  Hee-Koo Moon,et al.  Effects of hole spacing on spatially-resolved jet array impingement heat transfer , 2008 .

[40]  L. W. Florschuetz,et al.  Streamwise Flow and Heat Transfer Distributions for Jet Array Impingement with Crossflow , 1981 .

[41]  R. Viskanta.  Heat transfer to impinging isothermal gas and flame jets , 1993 .