Heat Transfer in Novel Internally-Finned Heat Exchange Passages

Heat exchange passages usually use internal fins to enhance heat transfer. These fins have ranged from simple ribs or turbulators to complex helical inserts. Applications of interest range from traditional heat exchangers to internal cooling of turbine blades. In the present paper, a novel fin design that combines the benefits of swirl, impingement and high heat transfer surface area is presented. Measurements of the internal heat transfer coefficients are provided using a liquid crystal technique. Pressure drop along the passage are also measured, therefore friction factors and thermal performance factors are presented. The experiments cover Reynolds number from 10,000 to 40,000 based on the hydraulic diameter of the main channel of the test section. Two models are tested, which have fins oriented at 30 degree and 45 degree to the flow direction, respectively. The results demonstrate that these novel designs produce overall heat transfer ratios greater than 3 compared to the smooth passage.Copyright © 2008 by ASME

[1]  J. Wagner,et al.  Heat transfer in rotating serpentine passages with trips skewed to the flow , 1992 .

[2]  James W. Baughn,et al.  Liquid crystal methods for studying turbulent heat transfer , 1995 .

[3]  M. Taslim,et al.  EXPERIMENTAL HEAT TRANSFER AND FRICTION IN CHANNELS ROUGHENED WITH ANGLED, V-SHAPED AND DISCRETE RIBS ON TWO OPPOSITE WALLS , 1994 .

[4]  Phil Ligrani,et al.  Comparison of Heat Transfer Augmentation Techniques , 2003 .

[5]  G. J. Vanfossen,et al.  Effect of Location in an Array on Heat Transfer to a Short Cylinder in Crossflow , 1984 .

[6]  C. Hoogendoorn,et al.  LOCAL COHVECTIVE-HEAT-TRANSFER COEFFICIENTS FOR JETS IMPINGING ON A PLATE; EXPERIMENTS USING A LIQUID-CRYSTAL TECHNIQUE , 1974 .

[7]  Jie Han,et al.  Heat transfer and friction characteristics in rectangular channels with rib turbulators , 1988 .

[8]  J. Wagner,et al.  Heat transfer in rotating serpentine passages with trips skewed to the flow , 1992 .

[9]  F Zhou,et al.  Mass/Heat Transfer in Dimpled Two‐Pass Coolant Passages with Rotation , 2001, Annals of the New York Academy of Sciences.

[10]  G. J. VanFossen.  Heat transfer coefficients for staggered arrays of short pin fins , 1981 .

[11]  R. J. Moffat,et al.  Measurement of temperature and heat transfer coefficient distributions in a complex flow using liquid crystal thermography and true-color image processing , 1989 .

[12]  M. Taslim,et al.  Darryl E. Metzger Memorial Session Paper: Experimental Heat Transfer and Friction in Channels Roughened With Angled, V-Shaped, and Discrete Ribs on Two Opposite Walls , 1996 .

[13]  R. J. Field,et al.  Liquid Crystal Thermography and Its Application to the Study of Convective Heat Transfer , 1975 .

[14]  Kuisoon Kim,et al.  A New Hue Capturing Technique for the Quantitative Interpretation of Liquid Crystal Images Used in Convective Heat Transfer Studies , 1991 .

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

[16]  Terry V. Jones,et al.  A Technique for Measuring Convective Heat Transfer at Rough Surfaces , 1990 .

[17]  A. V. Schukin,et al.  Study and Application of Hemispheric Cavities for Surface Heat Transfer Augmentation , 1995 .

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

[19]  Je-Chin Han,et al.  Heat Transfer and Friction in Rectangular Channels With Ribbed or Ribbed-Grooved Walls , 1994 .