 12-ME-65 Farrukh Zaheer  12-ME-62 Saqib Ali  12-ME-81 M.Umer Nissar  12-ME-80 Waqar Ahmed  12-ME-64 Ashfaq Younis.

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Presentation transcript:

 12-ME-65 Farrukh Zaheer  12-ME-62 Saqib Ali  12-ME-81 M.Umer Nissar  12-ME-80 Waqar Ahmed  12-ME-64 Ashfaq Younis

 If the fluid is moving with high velocity, then it is called jet.  Usually nozzels are used to increase the kinetic energy of the fluid.

Impact OF Jet On Curved Surfaces

 Whenever a jet of liquid impinges on a surface, it experiences some force as it is known as impact of jet.  This force is equal to the rate of change of momentum of the jet.(Newton second law of motion)

 Whenever a curved surfaced vane is placed in front of a liquid jet it exerts force on it during entering and leaving the vane this force is equal to the change of momentum of the jet according to Newton second law of motion.  Purpose of this presentation is to find out that force.

 1: Force Impinging on fixed curve vane.  2: Force impinging on a moving curved vane.

Consider a fixed curved vane.

 V = Velocity of the jet (AC), while entering the vane  V 1 = Velocity of the jet (EG), while leaving the vane  v 1, v 2 = Velocity of the vane (AB, FG)  α= Angle with the direction of motion of the vane, at which the jet enters the vane.

 V r = Relative velocity of the jet and the vane (BC) at entrance (it is the vertical difference between V and v).  β= Angle with the direction of motion of the vane, at which the jet leaves the vane.  V r1 = Relative velocity of the jet and the vane (EF) at exit (it is the vertical difference between v 1 and v 2.

 θ= Angle, which V r makes with the direction of motion of the vane at inlet (known as vane angle at inlet),  φ= Angle, which V r1 makes with the direction of motion of the vane at outlet (known as vane angle at outlet).  V w = Horizontal component of V (AD, equal to ). It is a component parallel to the direction of motion of the vane (known as velocity of whirl at inlet).

 V w1 = Horizontal component of V 1 (HG, equal to ). It is a component parallel to the direction of motion of the vane (known as velocity of whirl at outlet).  a = Cross sectional area of the jet.

 V f = Vertical component of V (DC, equal to ). It is a component at right angles to the direction of motion of the vane (known as velocity of flow at inlet).  V f1 = Vertical component of V 1 (EH, equal to ). It is a component at right angles to the direction of motion of the vane (known as velocity of flow at outlet).

 The relations between the inlet and outlet triangles ( untill and unless given) are: (i)V=v1, and (ii) Vr=Vr1 We know that the force of jet, in the direction of motion of the vane.