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Mechanics of Fluids

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Table A3.3 Adiabatic flow with friction in duct <strong>of</strong> constant<br />

cross-section (Fanno flow)<br />

M pc/p u/uc = ϱc ϱ T/Tc flmaxP/A<br />

0 0 0 1.200 ∞<br />

0.02 0.01826 0.02191 1.200 1778<br />

0.04 0.03652 0.0438 1.200 440<br />

0.06 0.05479 0.0657 1.199 193.0<br />

0.08 0.07308 0.0876 1.198 106.7<br />

0.10 0.09138 0.1094 1.198 66.9<br />

0.12 0.1097 0.1313 1.197 45.4<br />

0.14 0.1281 0.1531 1.195 32.51<br />

0.16 0.1464 0.1748 1.194 24.20<br />

0.18 0.1648 0.1965 1.192 18.54<br />

0.20 0.1833 0.2182 1.190 14.53<br />

0.22 0.2018 0.2398 1.188 11.60<br />

0.24 0.2203 0.2614 1.186 9.39<br />

0.26 0.2389 0.2829 1.184 7.69<br />

0.28 0.2576 0.3043 1.181 6.36<br />

0.30 0.2763 0.3257 1.179 5.30<br />

0.32 0.2951 0.3470 1.176 4.45<br />

0.34 0.3139 0.3682 1.173 3.752<br />

0.36 0.3329 0.3893 1.170 3.180<br />

0.38 0.3519 0.410 1.166 2.705<br />

0.40 0.3709 0.431 1.163 2.308<br />

0.42 0.3901 0.452 1.159 1.974<br />

0.44 0.4094 0.473 1.155 1.692<br />

0.46 0.4287 0.494 1.151 1.451<br />

0.48 0.4482 0.514 1.147 1.245<br />

0.50 0.4677 0.535 1.143 1.069<br />

0.52 0.4874 0.555 1.138 0.917<br />

0.54 0.507 0.575 1.134 0.787<br />

0.56 0.527 0.595 1.129 0.674<br />

0.58 0.547 0.615 1.124 0.576<br />

0.60 0.567 0.635 1.119 0.491<br />

0.62 0.587 0.654 1.114 0.417<br />

0.64 0.608 0.674 1.109 0.3533<br />

0.66 0.628 0.693 1.104 0.2979<br />

0.68 0.649 0.713 1.098 0.2498<br />

Appendix 3: Tables <strong>of</strong> gas flow functions 677<br />

continued overleaf<br />

Where flmaxP/A varies rapidly say up to M = 0.6 and above M = 3.0<br />

linear interpolation is not satisfactory. To obtain the length parameter for<br />

a given value <strong>of</strong> M, direct calculation from eqn 11.78 is probably simplest.<br />

To obtain M from a given value <strong>of</strong> flmaxP/A, inverse-square interpolation<br />

is recommended; for example, when flmaxP/A = 13,<br />

1 1 14.53 − 13<br />

= −<br />

M2 0.202 14.53 − 11.60<br />

whence M = 0.2097.<br />

�<br />

1 1<br />

−<br />

0.202 0.222 �<br />

= 27.27

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