Boundary Lyer Theory

frorii th; 1c;ulitig rxlge! (l3l:wi11s profile:, Wg. 7.7). 'l'hc: ~~a~l~tcrti or st,rcnn~lit~c~s in t,hc
it~il,i:~l Icngt,ll is UC~II tlr:lwn in Vig. 13.7, :LII~~ the: vc:locilfy ~)rolilcs arc scon ple)tAc~l
in IGg. 14.8. 'l'lie way in which tho I,outicl:~ry-layer tliick~icss incrcsscs from
n.t, the Icnding lctlgc? to it8 asym~)tot,ic value given in oqri. (14.7) is clo~cribotl hy
tdic values in 'I'nblc 14.1 which have bcon taken from It. Jgliscli's pepcr.
1'artic.ular int,crrst, is st.t:wlirtl to thr nnvi*g in drug ceusc.d by preserving
I:imit~ar flow with fhr aid of si1c4ion, an(l, thcrrforc, to the Inw of frirtiorl for the
'r:t1,l1: 14.1. I)iti~rttsio~ilrsq ~,ol~llc~:rr~-~:r~~~r
Ll~irlz~irss :rnd sh:rpo fnofnr R,/d, for t,hc vdorit.y profilc-s
ill t.lir* itlil,i:~l lc~t~~t.li 011 n I1:rt. plirl~ :kt, mro i~rciqlc~i(:e? \viCh rtttili~rtn ~ucl.iott, idler It. Iglisd~ [40J
ht -- ~lis~~lt~~~rtti~~trt.
t.liirlzt~css;
v ,?, - rnotiictil.it~~~ t.liinknr,sn
Fig. 14.8. Flnt plate wit,h
~l~iifortn liuctio~i ; velocity
profilcn ovcr init,inl length,
aftw lgliscli [40]
Tllr rurve 6 - a, corrrspowls 10
llw 'ruy~nplnlir s~tcllnn pronle' of
rqn (14.0)
,. I hin is the* (1~1.c clt~c to siukit~g, i.c. thf) (1r:~g oxlivrir~~cwl l~y ,I. II~IIJ lvlti(+ is ~I:I~,I>,! it1 :L 1.1.ic..
tionlrss st.ro:~tn of vrlociLy lJm ntid whirl^ 's~nllown' :I. q~tnnl.il.y (2 oI' IIt~icl. 'l'lrv :rl~~\~c. VY~I~(.X.
aioti call bc: tletl~toctl vcry nit~iply by 1.11~ npplie:ation of I.ho I~IOIII~~I~.IIIII 1.l1~ort.111 (TI. I'r:tt~~lt~l-
'I'ieljor~n, Ilyclro- 11. Aerorncchnnik, vol. I I, l!):lI, p. 140, Ihgl. t.rnllul. 1,~' .I. 1'. tlct~ l ln.rl,og, 1934.