Table 3.

Average value of curvature ${(\frac{R}{r})}^{1/2}$ = 0.41.

Velocity (m/s)	Re number	The Dean number	λ	Shear stress, τ 103 (N/m2)
0.2	747	153	0.13	0.65
0.4	1494	306	0.17	3.43
0.6	2241	459	0.2	9.1
1	3735	765.6	0.24	30.3
1.2	4482	918.8	0.26	47.2