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Boundary Lyer Theory

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312 SII. 'I'hrr~nnl I~ountlary laycrs in Inntinar flow<br />

pert prrforrncd measurements on circular cylintlers in a cross-flow of air covcring<br />

avcry witlcmngcof Itcynoltls numbers. ITigure 12.18co11tninsaplot ofthe mc:kn Nussclt<br />

numbcr N,,, tnlrcn for the wholc circumfcronce of the cylinder against the Itcynolds<br />

number R. 150th N,, and R arc based on the diameter of t,he cylintler. As n first<br />

crutlc a.pprnxiniation it can be a.ssumccl that N, is pr~port~ional t,o RU2 as confirmed<br />

by tl~c tllrorctird calculations for the f1:i.t plntc at zero incitlcncr, orp. (12.79a, b),<br />

and for t,he flow nonr a sbagnation point, eqn. (12.90), in laminar flow.<br />

The loral cocfficiolt of hcat transfer varies considerably over the surface of<br />

cylintlers nntl ot.hcr bodies; mrn.surcmrn1.s on circrllnr oylinrlcrs tlnc to R. Schmidt<br />

nntl I

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