Numerical analysis of laminar heat transfer in a channel with diamond-shaped baffles☆

Abstract Laminar periodic flow and heat transfer in a two dimensional horizontal channel with isothermal walls and with staggered diamond-shaped baffles is investigated numerically. The computations are based on the finite volume method, and the SIMPLE algorithm has been implemented. The fluid flow and heat transfer characteristics are presented for Reynolds numbers based on the hydraulic diameter of the channel ranging from 100 to 600. Effects of different baffle tip angles on heat transfer and pressure loss in the channel are studied and the results of the diamond baffle are also compared with those of the flat baffle. It is observed that apart from the rise of Reynolds number, the reduction of the baffle angle leads to an increase in the Nusselt number and friction factor. The computational results reveal that optimum thermal performance is at the baffle angle of 5° for baffle height and spacing of 0.5 and 1 times of the channel height, respectively. The thermal performance of the 5°–10°diamond baffle is found to be higher than that of the flat baffle for all Reynolds numbers used.

[1]  N. K. Anand,et al.  Use of porous baffles to enhance heat transfer in a rectangular channel , 2003 .

[2]  Yue-Tzu Yang,et al.  Calculation of turbulent flow and heat transfer in a porous-baffled channel , 2003 .

[3]  E. Sparrow,et al.  Fully Developed Flow and Heat Transfer in Ducts Having Streamwise-Periodic Variations of Cross-Sectional Area , 1977 .

[4]  S. Patankar,et al.  Numerical Prediction of Flow and Heat Transfer in a Parallel Plate Channel With Staggered Fins , 1987 .

[5]  V.M.K. Sastri,et al.  Laminar forced convection heat transfer of a non-newtonian fluid in a square duct , 1977 .

[6]  Kamel Hooman,et al.  Heat and fluid flow in entrance region of a channel with staggered baffles , 2006 .

[7]  Mohamed A. Habib,et al.  Experimental Investigation of Heat Transfer and Flow Over Baffles of Different Heights , 1994 .

[8]  F. Durst,et al.  Flow Around Baffles , 1984 .

[9]  K. Vafai,et al.  Effects of boundary conditions on non-Darcian heat transfer through porous media and experimental comparisons , 1995 .

[10]  Y. Jaluria,et al.  An Introduction to Heat Transfer , 1950 .

[11]  S. Patankar.  Numerical Heat Transfer and Fluid Flow , 2018, Lecture Notes in Mechanical Engineering.

[12]  Cheng Chin-Hsiang,et al.  Numerical prediction for laminar forced convection in parallel-plate channels with transverse fin arrays , 1991 .

[13]  Chin‐Hsiang Cheng,et al.  Laminar forced convection flows in horizontal channels with transverse fins placed in entrance regions , 1989 .

[14]  Jen-Chieh Cheng,et al.  ENHANCEMENT OF HEAT TRANSFER FROM SURFACE-MOUNTED BLOCK HEAT SOURCESIN A DUCT WITH BAFFLES , 2003 .

[15]  M. D. de Lemos,et al.  Flow and Heat Transfer in a Parallel-Plate Channel with Porous and Solid Baffles , 2006 .

[16]  B. W. Webb,et al.  Conjugate heat transfer in a channel with staggered ribs , 1985 .

[17]  Zhongyu Guo,et al.  Three-dimensional heat transfer in a channel with a baffle in the entrance region , 1997 .

[18]  N. K. Anand,et al.  CONVECTIVE HEAT TRANSFER IN A CHANNEL WITH POROUS BAFFLES , 2004 .

[19]  L. Fletcher,et al.  Heat transfer in a three-dimensional channel with baffles , 1996 .