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TECHNICAL PAPERS: Forced Convection

Effect of Turbulence With Different Vortical Structures on Stagnation Region Heat Transfer

[+] Author and Article Information
Aung N. Oo

Faculty of Engineering and Applied Science Memorial University of Newfoundland St. John’s, Newfoundland, A1B 3X5, Canadae-mail: aung@engr.mun.ca

Chan Y. Ching

Dept. of Mechanical Engineering, McMaster University, Hamilton, Ontario, L8S 4L7, Canadae-mail: chingcy@mcmaster.ca

J. Heat Transfer 123(4), 665-674 (Jan 20, 2001) (10 pages) doi:10.1115/1.1375165 History: Received June 30, 2000; Revised January 20, 2001
Copyright © 2001 by ASME
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References

Figures

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Vortex stretching and vorticity intensification around the leading edge
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Schematic diagram of heat transfer model
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Spanwise temperature distributions of heated stainless steel strips (○, strip no. 1; □, 2; ▵, 3; ⋄, 4;  * , 5; o, 6; +, 7; ×, 8; −, 9; ⋄, 10)
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Streamwise turbulence intensity downstream of the grids (⋄, —, 2.86 cm rod-grid; ▵, - - -, 1.59 cm rod-grid; ○, - — -, 0.95 cm rod-grid)
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Streamwise integral length scale downstream of the grids for ReD=108,350 (⋄, —, 2.86 cm rod-grid; ▵, - - -, 1.59 cm rod-grid; ○, - — -, 0.95 cm rod-grid)
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RMS fluctuating velocity components of grids in perpendicular orientation for ReD=108,350 (2.86 cm rod-grid; ⋄, u; ▵, v; ○, w; 1.59 cm rod-grid; ⋄, u; ▵, v; ○, w; 0.95 cm rod-grid: ⋄, u; ▵, v; ○ w)
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Distribution of Frossling number in the stagnation region for ReD=108,350 grids (⋄, 2.86 cm rod-grid; ▵, 1.59 cm rod-grid; ○, 0.95 cm rod-grid; —— Frossling solution))
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Stagnation line Frossling number for 2.86 cm rod-grid (⋄, ReD=67,750 (R); ⋄, 67,750 (L); ▵, 108,350 (R); ▵, 108,350 (L); ○, 142,250 (R); o, 142,250 (L))
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Stagnation line Frossling number for 1.59 cm rod-grid (⋄, ReD=67,750 (R); ⋄, 67,750 (L); ▵, 108,350 (R); ▵, 108,350 (L); ○, 142,250 (R); o, 142,250 (L))
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Stagnation line Frossling number for 0.95 cm rod-grid (⋄, ReD=67,750 (R); ⋄, 67,750 (L); ▵, 108,350 (R); ▵, 108,350 (L); ○, 142,250 (R); o, 142,250 (L))
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Difference in heat transfer with grid in perpendicular over parallel orientation for ReD=108,350 (⋄, 2.86 cm rod-grid; ▵, 1.59 cm rod-grid, ○, 0.95 cm rod-grid)
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Stagnation line Fr versus correlation parameter proposed by VanFossen et al. 12 (Orientation of rod-grids: ○, perpendicular; ▵, parallel, Correlation lines: ——, van Fossen et al.; - - -, +4%; — - —; −4%)
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Stagnation line Fr versus correlation parameter for both grid orientations (⋄, Data, Correlation lines: ——, Eq. (5); - - -, +6%; — - —; −6%)
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Stagnation line Fr versus correlation parameter for rod-grids in perpendicular orientation (⋄, Data, Correlation lines: ——, Eq. (6); - - -, +4%; — - —; −4%)
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Stagnation line Fr versus correlation parameter for rod-grids in parallel orientation (⋄, Data, Correlation lines: ——, Eq. (7); - - -, +4%; — - —; −4%)

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