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By Th. Von Kármán

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For its calculation in the classical way we have to perform the mixing in a reversible way which can be done, at least on principle, by the application of semi-permeable pistons. Heat has to be added and work is done. If we use one mole of each gas for example, entropy is increased by As = R - 2 · In 2 as a simple calculation shows. j Ί. Wire mesh screen Gae supply L k Icorni igno- rieren ry w modeler FIG. 20. Experiment of Kantrowitz, showing loss of stagnation pressure in consequence of an entropy increase by relaxation.

S Madrid 1958), de J . - P . GUIRAUD 46 sorte que la formule précédente devrait être appelée formule de NewtonBusemann-Hayes. Cette formule est suffisamment simple pour se laisser mener jusqu'aux applications numériques dans quelques cas. Nous citerons trois exemples typiques: force globale à l'intrados d'une aile mince(28), efforts globaux agissant sur des obstacles de révolution sous faible incidence*28,29), cônes circulaires sous incidence(43). Ce dernier cas est particulièrement simple et Laval(43) a pu exprimer la finesse d'un cône d'ouverture 20 par la formule: f = 1£λ \ *lmaX cos (20) = j^sinfl 3cos(20)—i Après avoir mentionné quelques applications de la théorie, il est instructif d'en discuter les limitations.

Values of the state variables inside a normal shock after R. Becker. L is free path length. The different terms of the energy-equation are drawn separately in the last diagram. 85 · 10~4 — - — . cm2 cm sec άΤ j 4 aw\ aw , , d 2 T equation: c y . ^ . _ = - ( p - y ^ - ) . _ + Energy A . — Thomas has included the variability of the coefficients of heat conduction and viscosity (μ ~ \/Τ) and he found values for the thickness little differing from Becker's(17). 8 The finite limit comes from the indefinite growing of viscosity and heat conductivity with shock strength.

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