Impact of Jet

C seismic disturbance OF JET EXPERIMENT 1 Aim To regulate the impact force caused by a liquified cat valium on a plain cuticle and a hemispherical crustal graduated table and compare it with the judge theoretical force. 2 Theory When a safety device ball strikes a solid muster it nicely rebounds from the solid surface. The amount of rebound would depend on the coefficient of restitution. However, when a becalm fluid special K strikes a solid surface, it does not rebound. But, a stream of fluid is formed which moves over the surface and the fluid leaves the surface tangentially. If a fluid greens is impacting a horizontal coat, at an angle ? the point of change of neural impulse can be equated to the force exerted by the kilobyte on the plate. When a vertical fluid jet strikes a horizontally positioned plate, the value of ? pass on be 90. A control volume epitome can be performed to give the force F = ? QV, (1) where ? is the density of the water, Q is the jet flo w shape and V is the velocity of the jet. For the case of a hemispherical nonplus when the stream of water is turned back by 180o, the force experienced by the shell will be F = 2? QV, (2) two propagation the force experienced by the flat plate. data-based Set-up The set up consists of a closed cylindric container housing the horizontal plate/hemispherical shell to receive the impact of the jet. The vertical water jet is produced by a pump forcing water by dint of a bird of Minerva of diameter 6mm for the flat plate and of diameter 8mm for the hemispherical set up. The flow rate through the nozzle is measured by a rotameter. The velocity of jet could be obtained by keen the flow rate. 4 Experimental Procedure shifting on the motor and using the two doorway valves control the flow rate.Place suitable ladings to counter equilibrium the impact force of the liquid jet. When the blame is higher(prenominal) than the impact load of the jet, the jet will be blocked by the plate . When the load is low the load outgrowth will rise up and equal the top part of the housing. Adjust the flow rate for any selected weight so that the load arm stays in the middle of the distance from the nozzle tip to the top part of the housing. visit that the beauty flow rate is maintained and take at least six independent measurements by choosing six different flow rates that would balance the weights.Important step 1 Allow the float to be steady before you start noting down the readings. 2 Ensure that the fluid jet nicely counter balances the weight it is carrying. Flat plate S. nary(prenominal) Flow prize Q (m3/s) speed V (m/s) Force (Experimental) Fex (N) Force (Theoretical) Fth (N) S. No. Flow Rate Q (m3/s) Hemispherical shell Velocity V (m/s) Force (Experimental) Fex (N) Force (Theoretical) Fth (N) 5 Results and raillery Plot the pursuance graphs. Fex vs Fth 2. Fex/(1/2 ? V2 A) vs Re=Vd/? , where A is the commonwealth of cross section of the jet and Re is the Rey nolds number of the jet 1.The graphs for the flat plate and the hemispherical shell should be plotted on the same graph. Based on these plots answer the following questions 1. Do a control volume formulation to derive (1) and (2). 2. Why is the force independent of the area of the plate/shell? 3. What is the deliver of the Fex vs F th plot. What should the ideal value of this slope be? If the slope is different from the ideal value, why is it different. 4. What non dimensional number is the y axis of the second plot? What is the importation of the variation this non dimensional number that you observe from your experiments?