# Impact of Jet Essay Example

Jet Impact 6

Impact of Jet

Introduction

Hydrothermal jet technology is one of the new drilling technological methods where rocks are broken down by the use of both thermal spallation and high velocity impact effect (Song et al., 2016). The technology uses the high temperature and high velocity to break rocks and jet method thermal force is employed (Song et al., 2016). This paper discusses experimental calculation and the impact of jet.

Water temperature = 18 C

6 litres of water was used.

Data Table 1: Reduced Flow Rate

Table 2: Flow Rate Off

 Distance (X) “mm” Time “s” Flow Rate “L/s” Experimental Force Theoretical Force
 Distance (X) “mm” Time “s” Flow Rate “L/s” Experimental Force Theoretical Force Density p=M/V

Mass = 600g

Volume = L X W X H

= (10 X 150 X 35)/1000

Density = M/V

= 0.11429

Theoretical force Reduced flow rate

F1 = 0.11429 *0.52 *(148/11.54) * (1-cos90)

F2 = 0.11429 *0.47*(125/12.56) * (1-cos 30)

F3 = 0.11429 *0.44*(105/13.7) * (1-cos 120)

F4 = 0.11429 *0.39*(85/15.5) * (1-cos 180)

F5= 0.11429 *0.33*(65/18.44) * (1-cos 30)

F6= 0.11429 *0.29*(45/20.41) * (1-cos 90)

F7= 0.11429 *0.22*(25/27.29) * (1-cos 120)

Flow rate off

F1 = 0.11429 *0.51 *(80/11.84) * (1-cos90)

F2 = 0.11429 *0.48* (70/12.5) * (1-cos 30)

F3 = 0.11429 *0.44*(60/13.7) * (1-cos 120)

F4 = 0.11429 *0.41*(50/14.56) * (1-cos 90)

F5= 0.11429 *0.36*(40/16.47) * (1-cos 30)

F6= 0.11429 *0.32*(30/18.75) * (1-cos 90)

F7= 0.11429 *0.28*(20/21.50) * (1-cos 120)

Discussion and conclusion

It is clear from the two graphs below that the force which is being produced of the vanes to large extent is proportionate to the momentum of flow in the jet as it strikes the vane and as a results this produces similar directly proportionate experimental force and the theoretical force (Song et al., 2016). In reduced flow rate, the maximum theoretical force is produced when the jet is deflected through 90o and the lowest in the case of reduced flow rate occurs when the jet is deflected at 120o. Similarly when the flow rate is off, the jet is deflected furthest when it is at 90 degrees (Song et al., 2016). This gives similar or direct proportionate values in the two cases (Song et al., 2016). Another factor that influence the degree of deflection or the force is the flow rate.  Conclusion

The ratio between measured force and the theoretical maximum may be regarded as an efficiency of the vane, 0.96 in this case, and will always be less that 1.00 because losses will always occur in practice (Song et al., 2016).

Song, X., Lv, Z., Li, G., Hu, X., & Shi, Y. (2016). Numerical analysis of characteristics of multi-orifice nozzle hydrothermal jet impact flow field and heat transfer. Journal of Natural Gas Science and Engineering, 35, 79-88.