Prandtl-Number Effects and Generalized Correlations for Confined and Submerged Jet Impingement

Abstract The influence of fluid thermophysical properties on the heat transfer from confined and submerged impinging jets is experimentally investigated. Results from previous studies at low and high Prandtl numbers (using air and Fluorinert liquid FC-77, respectively) are supplemented by new experiments for an intermediate Prandtl number (using water). Local heat transfer coefficients are obtained from a discrete heat source under axisymmetric confined and submerged jets. The parameter ranges studied include: orifice diameters of 1.59–12.7 mm, turbulent-flow Reynolds numbers of 4000–23 000, and orifice to heat-source spacings of 1–5 jet diameters. Generalized correlations for heat transfer rates are proposed based on these results, and are valid over the range of coolant Prandtl numbers from 0.7 to 25.2.

[1]  W. Nakayama,et al.  Local Characteristics of Convective Heat Transfer From Simulated Microelectronic Chips to Impinging Submerged Round Water Jets , 1993 .

[2]  Suresh V. Garimella,et al.  Confined and Submerged Liquid Jet Impingement Heat Transfer , 1995 .

[3]  Suresh V. Garimella,et al.  A study of the flow field of a confined and submerged impinging jet , 1998 .

[4]  James W. Baughn,et al.  An Experimental Study of Entrainment Effects on the Heat Transfer From a Flat Surface to a Heated Circular Impinging Jet , 1991 .

[5]  John H. Lienhard,et al.  LIQUID JET IMPINGEMENT , 1995 .

[6]  Jung-Yang San,et al.  Impingement cooling of a confined circular air jet , 1997 .

[7]  Suresh V. Garimella,et al.  Nozzle-geometry effects in liquid jet impingement heat transfer , 1996 .

[8]  Frank P. Incropera,et al.  Correlating Equations for Impingement Cooling of Small Heat Sources With Multiple Circular Liquid Jets , 1993 .

[9]  Suresh V. Garimella,et al.  Heat Transfer from a Discrete Heat Source in Confined Air Jet Impingement , 1998 .

[10]  Suresh V. Garimella,et al.  Orifice and Impingement Flow Fields in Confined Jet Impingement , 1998 .

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

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

[13]  B. W. Webb,et al.  Single-Phase Liquid Jet Impingement Heat Transfer , 1995 .

[14]  Robert Gardon,et al.  The role of turbulence in determining the heat-transfer characteristics of impinging jets , 1965 .

[15]  Suresh V. Garimella,et al.  Heat Transfer and Flow Fields in Confined Jet Impingement , 2000 .

[16]  Suresh V. Garimella,et al.  Flow field effects on heat transfer in confined jet impingement , 1997 .

[17]  Arun S. Mujumdar,et al.  Effect of semi-confinement on impingement heat transfer , 1982 .