Row Removal Heat Transfer Study for Pin Fin Arrays

Arrays of variably-spaced pin fins are used as a conventional means to conduct and convect heat from internal turbine surfaces. The most common pin shape for this purpose is a circular cylinder. Literature has shown that beyond the first few rows of pin fins, the heat transfer augmentation in the array levels off and slightly decreases. This paper provides experimental results from two studies seeking to understand the effects of gaps in pin spacing (row removals) and alternative pin geometries placed in these gaps. The alternative pin geometries included large cylindrical pins and oblong pins with different aspect ratios. Results from the row removal study at high Reynolds number showed that when rows four through eight were removed, the flow returned to a fully-developed channel flow in the gap between pin rows. When larger alternative geometries replaced the fourth row, heat transfer increased further downstream into the array.Copyright © 2014 by ASME

[1]  W. Abdel-Messeh,et al.  Characteristics of Partial Length Circular Pin Fins as Heat Transfer Augmentors for Airfoil Internal Cooling Passages , 1989 .

[2]  D. E. Metzger,et al.  PRESSURE LOSS AND HEAT TRANSFER THROUGH MULTIPLE ROWS OF SHORT PIN FINS , 1982 .

[3]  D. Metzger,et al.  Row Resolved Heat Transfer Variations in Pin-Fin Arrays Including Effects of Non-Uniform Arrays and Flow Convergence , 1986 .

[4]  J. Armstrong,et al.  A Review of Staggered Array Pin Fin Heat Transfer for Turbine Cooling Applications , 1987 .

[5]  Nafiz H. K. Chowdhury,et al.  Heat Transfer and Pressure Drop Measurements in High Solidity Pin Fin Cooling Arrays With Incremental Replenishment , 2012 .

[6]  Karen A. Thole,et al.  Wake development in staggered short cylinder arrays within a channel , 2012 .

[7]  M. Chyu,et al.  Effects of Height-to-Diameter Ratio of Pin Element on Heat Transfer From Staggered Pin-Fin Arrays , 2009 .

[8]  K. Thole,et al.  Heat Transfer From Low Aspect Ratio Pin Fins , 2007 .

[9]  Minking K. Chyu,et al.  Convective Heat Transfer of Cubic Fin Arrays in a Narrow Channel , 1996 .

[10]  Robert J. Moffat,et al.  Describing the Uncertainties in Experimental Results , 1988 .

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

[12]  Jason K. Ostanek.  Improving Pin-Fin Heat Transfer Predictions Using Artificial Neural Networks , 2014 .

[13]  Lindsay A. Klennert,et al.  Endwall Heat Transfer Measurements in a Staggered Pin Fin Array With an Adiabatic Pin , 2007 .

[14]  Jason K. Ostanek.  Flowfield interactions in low aspect ratio pin-fin arrays , 2012 .

[15]  Karen A. Thole,et al.  Effects of Varying Streamwise and Spanwise Spacing in Pin-Fin Arrays , 2012 .

[16]  Bruno Facchini,et al.  ResearchArticle Experimental Investigation of Innovative Internal Trailing Edge Cooling Configurations with Pentagonal Arrangement and Elliptic Pin Fin , 2008 .

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

[18]  C F Colebrook,et al.  TURBULENT FLOW IN PIPES, WITH PARTICULAR REFERENCE TO THE TRANSITION REGION BETWEEN THE SMOOTH AND ROUGH PIPE LAWS. , 1939 .

[19]  Karen A. Thole,et al.  Flowfield Measurements in a Single Row of Low Aspect Ratio Pin-Fins , 2012 .

[20]  K. Thole,et al.  Heat transfer from multiple row arrays of low aspect ratio pin fins , 2011 .

[21]  Forrest E. Ames,et al.  The Influence of Reynolds Number and Row Position on Surface Pressure Distributions in Staggered Pin Fin Arrays , 2006 .

[22]  Oguz Uzol,et al.  Heat Transfer, Pressure Loss and Flow Field Measurements Downstream of Staggered Two-Row Circular and Elliptical Pin Fin Arrays , 2005 .

[23]  M. Chyu.  Heat Transfer and Pressure Drop for Short Pin-Fin Arrays With Pin-Endwall Fillet , 1989 .

[24]  Forrest E. Ames,et al.  Turbulent Augmentation of Internal Convection Over Pins in Staggered Pin Fin Arrays , 2004 .