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. Author manuscript; available in PMC: 2012 Jul 1.
Published in final edited form as: Int J Heat Mass Transf. 2011 Jul;54(15-16):3191–3200. doi: 10.1016/j.ijheatmasstransfer.2011.04.011

Table 2.

Comparison of the vortices’ sizes between the experimental results and the computational fluid dynamics (CFD) results using three different cylinder arrangements: tandem (α = 0°), staggered (α = 45°), and side-by-side (α = 90°)

α = 0° *X/D (PIV) X/D (CFD) Error %
Ns=0.18, Re = 1 26 27.23 4.73
Ns=0.18, Re = 3 23.04 23.32 1.22
Ns=0.18, Re = 5 20.476 19.142 6.51
Ns=0.37, Re = 1 25 19.14 23.4
Ns=0.37, Re = 3 25.28 21.23 16.02
α = 45° X/D (PIV) X/D (CFD) Error %
Ns=0.18, Re = 1 ~23 21.4 12.6
Ns=0.37, Re = 1 21.18 17.4 17.84
α = 90° X/D (PIV) X/D (CFD) Error %
Ns=0.37, Re = 1 23.6 22.67 3.94
Ns=0.18, Re = 5 32–33.1 29.65 4.4
*

X/D: Ratio of the vortex length to the cylinder diameter