Boundary Lyer Theory

642 XXI. Ttlrbulent boundnry lnycn nt zero prcwtlrn gradient
Tnble 21.1. Itcniutnnce forrndn for flat plnte computcd front the lognritlimic velocity profile
in eqns (21.14) and (21.15); sec curve (3) in Fig. 21.2
R,. 10-8
0-107
0.225
0.355
0548
0,864
1.20
2.07
343
6.43
9.70
18.7
34.3
51.8
102
229
125
768
1576
l~ergcr [67] on cloth-covered glazctl platcs lio somewhat above t,he turl~ulent. curve (2),
which would indicate that, there was no substantial laminar length in his expcrimenb
mil that the roughness was small. The measurcme~it~s duc to P. Gebers [10], which
mngc from R, = 10"m 3 x lo7, fall on tlic transition curve (3a), cqn. (21.1Ga), at
the lower end of the mngc. At thc higher Reynolds numbers his results lie on curve (3)
from eqn. (21.16). 'l'he measurements reported by K. E. Schoenherr [50] also show
good agreement with tlicory. 'l'hc highest Reynolds numbers have been whieved
hy (2. I