ME 306 FORMULAE
Transkript
ME 306 FORMULAE
ME 306 FORMULAE water = 1000 kg/m3 kair = 1.4 k cp cp cv air = 1.2 kg/m3 g = 9.81 m/s2 sin 1 Ma du dy p RT D d d (V.n)dA 0 A S dt t D S D T dt S V d ax Du u u u u u v w dt t x y z Vd V (V.n)dA A t (rxV)d a DV V (V.)V dt t (rxV)d (rxV)(V.n)dA A t Q DS S D sd sd s (V.n)dA A T dt dt S t u v w D 0 dt x y z 1 ht p V2 z g 2 g P gQhs Q Q d 3 h CD D 0.5 U 2 A CL P P d 3 5 A hf k V2 L V2 f 2g D 2g DV p 2 V fb dt p1 V12 p V2 z1 2 2 z2 hs h f g 2 g g 2 g 1 1 2 2 0 r r r r r 2 2 z 2 L 0.5 U 2 A / d 1.11 6.9 1 1.8 log Red f 3.7 gh 2d 2 m (V.n)dA DN N V. N dt t V (V. )V fb p t V p V2 p V2 ds 2 2 gz2 1 1 gz1 t 2 2 dx dy d z u v w c kRT V2 V2 Q W (u gz )d (h gz )(V.n)dA A t 2 2 2 c p cv R Rair = 287.1 J/(kgK) (cp)air = 1005 J/(kgK) kR k 1 F dt patm = 100 kPa V.dr (xV).ndA (ξ.n)dA C d 2 A 2 2 2 0 x 2 y 2 z 2 A f 64 Re Re 0.2 P 1 / 2 Q 1 / 2 P gQh 0.51 m Ns N sp 1 m (gh) 3 / 4 1 / 2 (gh) 5 / 4 Re p 2 Q1 / 2 v u p V p NPSH ξ xV z NPSH s s v S 3/ 4 g 2 g g h (gNPSH ) x y 1p u x y v uniform U (cos x sin y ) 2 vortex Rex U x Dlam ( m )tur vortex lam 0.03605 x Rex0.2 ln r 2 doublet ( d ) lam Re x d cos 2r 1.721x w 0.0225 U U ( w )tur m 0 u U 0.02884 U 2 Rex0 .2 u 1 U dy V source tur Re x 0.3708 x Rex0.2 u x 0 U u 1 U 0.3321U 2 Re x ( d )tur dy q 2 L U ( w ) lam 0.03605 bU 2 L Dtur ReL0.2 w U 2 source d sin 2r 0.664 x 1/ 4 1 r r q ln r 2 doublet ( m ) lam Re x 2 ReL 1 r r Vr uniform U (cos y sin x ) 5x 0.6642bU 2 L x y 0.04634 x Rex0 .2 u d 1 dy 0 U