Equation of continuity The mass flow rate through any Cross section of apipe will be same. Equation of continuity is the law of conservation of mass. a a VI V3 V2 A1 A3 A2 (mf. r ), = (m.f.r). = (m.f.r) PA,V, = PA2V2 = SA3N3 3
Air, = A2 V2 = A3 V3 AV = const, Ax Special case A,V2 A, V, A3,V3 A.V, = A2V2 t A3V3 nholes V1 3 V a A, A,V, =nav
If area doubles then velo- city become half if cliameter of radius cloubles then velocity becomes 1/4 th in turbulent flow the velo- city of fluid particle in contact with the walls of the tabe is may have any values. ¥ in a Stream line flow , the velocity of fluid particle in contact with walls of tube is zero.