Dehkhoda, Sevda and Hood, Michael and Alehossein, Habib and Buttsworth, David (2012) Analytical and experimental study of pressure dynamics in a pulsed water jet device. Flow, Turbulence and Combustion, 89 (1). pp. 97-119. ISSN 1386-6184
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Official URL: http://www.springerlink.com/content/614vu0461x747358/
Identification Number or DOI: doi: 10.1007/s10494-012-9393-0
Pulsed high-velocity water jets are of interest for breaking rocks and other materials. This paper describes a straightforward way of generating single water pulse with a hammer impacting a piston that rests on top of a chamber filled with water. This impacting action pressurises the water, expelling it at high velocity through a nozzle. A theoretical investigation is outlined aimed at gaining a better understanding of this system for generating water pulses. A computational model is developed to simulate the pressure dynamics in the chamber based on continuity and momentum equations for a compressible viscous flow. This model is used to optimise the relative sizes of the hammer and piston as well as the height of the water column to produce the highest velocity water pulse. The model was validated by building an experimental apparatus. In these experiments maximum pressures of about 200 MPa were measured inside the chamber over a time period of about 560 μs. This produced a water pulse with maximum velocity of 600 m/s. Experiments were conducted with nozzle diameters between about 1 mm and 4 mm to study the effect of discharge volume on the pressure history. The results illustrate that although the peak attainable pressure decreases with an increase in nozzle diameter, the duration of the elevated pressure remains similar for all nozzles.
|Item Type:||Article (Commonwealth Reporting Category C)|
|Additional Information:||Permanent restricted access to published version due to publisher copyright policy (Springer).|
|Uncontrolled Keywords:||pulsed water jet; compressible fluid; experimental study; computational study|
|Fields of Research (FOR2008):||04 Earth Sciences > 0404 Geophysics > 040403 Geophysical Fluid Dynamics|
09 Engineering > 0913 Mechanical Engineering > 091307 Numerical Modelling and Mechanical Characterisation
01 Mathematical Sciences > 0102 Applied Mathematics > 010207 Theoretical and Applied Mechanics
|Socio-Economic Objective (SEO2008):||E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering|
|Deposited On:||09 Sep 2012 22:47|
|Last Modified:||05 Feb 2013 09:05|
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