Boundary Lyer Theory

is prol)nt~t,iot~nl to the rnclius. Consctl~lcl~tly, loss fluid is transprtctl to each blntfc
from t h contm tAan awry from it and outwarclu, ant1 tl~c bor1ntlnry layer is thinner
t.llnn woultl be I(II~ casc in t~wo-t~itiicnsiotl:rI flow about the same slrape. A. Betz 161
gave some t(t~eorct.icnl argumcnta on l.his point. F. Gutscl~e [42J made tile flow on
a propellor I~lntlc visible: I)y ~~ainting Chc former with a tlyc. Ccl~t~riftlgal forces also
rxcrl :r hr~c itl~lut:ncc on the J)rocc:c%s of 1.mnsiI.ion. I[. M~lcsnlal~n [(j8] sllowctl ill
his t.hc.sis t,l1:itp, otl~cr thit~gs being cqnal, trarlsition occurs or1 a rotatirlg propeller
I)la.tlc at. :t. considcrat)ly lowcr Ltcynolds number than on one wl~icll is stationsr.y.
Fig. 22.18. ConvcrgrnL :tntl clivcrgent
hounclnry Inycrs; ~yrrtmn of
coordinnten;
a) divcrgc~~t~,
a -1 z > 0 ;
11) oonvcrgcnl., a I- :r -:
0 La- ' "n*,
3. (:rcnvcrgc~lt ~ IICI clivcrgeni bo~rrdnry layers. 'rhc methods for tllc calculat,ion
of t,r~r\)t~lcnt 1)ortntlary layrrs wlrith were tlcscribed in Scc. XXlTb have been ext,cntlntl
11y A. l