Evaluation of heat transfer performances of various rib shapes

Abstract The heat transfer and friction loss performances of rib-roughened rectangular cooling channels having a variety of cross-sectional rib shapes were analyzed using three-dimensional Reynolds-averaged Navier–Stokes equations. Numerical simulations were conducted for sixteen rib shapes: square, isosceles triangular, fan-shaped, house-shaped, reverse cut-trapezoidal, cut-trapezoidal, reverse boot-shaped, boot-shaped, reverse right-angle triangular, right-angle triangular, reverse pentagonal, pentagonal, reverse right-angle trapezoidal, right-angle trapezoidal, isosceles trapezoidal, and semicircular ribs. The ratios of pitch, height, and width of the rib to hydraulic diameter of the channel were set to 10, 0.047, and 0.047, respectively. The Reynolds stress model was used with the Speziale–Sarkar–Gatski pressure–strain model to analyze the turbulence. The computational results for the area-averaged Nusselt number were validated by comparison with the experimental data under the same conditions. The effects of the Reynolds number and rib pitch-to-width ratio on the performances of various ribs were also investigated for Reynolds numbers of 5000–50,000 and rib pitch-to-width ratios of 5.0–10.0, respectively. The new boot-shaped rib design showed the best heat transfer performance with a pressure drop similar to that of the square rib.

[1]  M. Taslim,et al.  Effects of turbulator profile and spacing on heat transfer and friction in a channel , 1994 .

[2]  J. Leylek,et al.  Prediction of Heat Transfer in a Ribbed Channel: Evaluation of Unsteady RANS Methodology , 2005 .

[3]  J. P. Hartnett,et al.  Advances in Heat Transfer , 2003 .

[4]  Je-Chin Han,et al.  Heat transfer and friction behaviors in rectangular channels with varying number of ribbed walls , 2003 .

[5]  S. Parneix,et al.  Experimental and numerical study of developed flow and heat transfer in coolant channels with 45 degree ribs , 1999 .

[6]  Reza Kamali,et al.  The importance of rib shape effects on the local heat transfer and flow friction characteristics of square ducts with ribbed internal surfaces , 2008 .

[7]  S. Eiamsa-ard,et al.  Numerical Investigation of Flow Friction and Heat Transfer in a Channel with Various Shaped Ribs Mounted on Two Opposite Ribbed Walls , 2011 .

[8]  B. Sundén,et al.  Heat transfer and pressure drop measurements in rib-roughened rectangular ducts , 2001 .

[9]  R. Hino,et al.  Experimental analysis of turbulent flow structure in a fully developed rib-roughened rectangular channel with PIV , 2002 .

[10]  Lei Wang,et al.  Experimental Investigation of Local Heat Transfer in a Square Duct With Continuous and Truncated Ribs , 2005 .

[11]  Je-Chin Han,et al.  Effect of Rib Profiles on Turbulent Channel Flow Heat Transfer , 1998 .

[12]  Daniele Ricci,et al.  Numerical Analysis of Water Forced Convection in Channels with Differently Shaped Transverse Ribs , 2011, J. Appl. Math..

[13]  Je-Chin Han,et al.  An investigation of heat transfer and friction for rib-roughened surfaces , 1978 .

[14]  Jianmin Gao,et al.  Numerical Investigation of Heat Transfer and Flow Characteristics in a Steam-Cooled Square Ribbed Duct , 2010 .

[15]  Kwang-Yong Kim,et al.  Design optimization of rib-roughened channel to enhance turbulent heat transfer , 2004 .

[16]  Kwang-Yong Kim,et al.  Shape optimization of three-dimensional channel roughened by angled ribs with RANS analysis of turbulent heat transfer , 2006 .

[17]  J. S. Park,et al.  Measurement of heat transfer and pressure drop in rectangular channels with turbulence promoters , 1986 .

[18]  Kwang-Yong Kim,et al.  Shape optimization of rib-roughened surface to enhance turbulent heat transfer , 2002 .

[19]  Jenn-Jiang Hwang,et al.  Effect of ridge shapes on turbulent heat transfer and friction in a rectangular channel , 1993 .

[20]  H. Schlichting.  Boundary Layer Theory , 1955 .

[21]  Lei Wang,et al.  Experimental investigation of local heat transfer in a square duct with various-shaped ribs , 2007 .

[22]  Kwang-Yong Kim,et al.  Design Optimization of Internal Cooling Passage with V-shaped Ribs , 2007 .

[23]  T. Gatski,et al.  Modelling the pressure–strain correlation of turbulence: an invariant dynamical systems approach , 1991, Journal of Fluid Mechanics.

[24]  P. Promvonge,et al.  Thermal performance assessment of turbulent channel flows over different shaped ribs , 2008 .