impact pressure


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impact pressure

[′im‚pakt ‚presh·ər]
(fluid mechanics)

impact pressure

i. The pressure of a moving fluid brought to rest that is in excess of the pressure the fluid has when it does not flow (i.e., total pressure less static pressure). Impact pressure is equal to dynamic pressure in an incompressible flow, but, in a compressible flow, impact pressure includes the pressure change attributable to the compressibility effect.
ii. A measured quantity obtained by placing an open-ended tube, known as an impact tube or a pitot tube, in a gas stream and noting the pressure in the tube on a suitable manometer. Since the pressure is exerted at a stagnation point, the impact pressure is sometimes referred to as the stagnation pressure or the total pressure. See stagnation pressure.
References in periodicals archive ?
The gas impact pressure produced by liquid carbon dioxide phase transition applied to the boundary of blast hole was obtained from the tests, and the values of impact pressure changed over time, as shown in Figure 9.
However, designers working in such application areas have until recently struggled to accurately quantify the particle distribution and impact pressure of fluid or gas spray.
For example, avalanches that flow warm and wet smash with an impact pressure that increases with depth, hitting the hardest at the avalanche base.
The 2D impact pressure using different free surface capturing methods is shown in Figure 4 together with the experimental data by Hu and Kashiwagi [22].
The reason is that the introduction of pulsations into the water jets enables to increase their cutting efficiency due to the fact that the impact pressure (so-called water-hammer pressure) generated by an impact of bunch of water on the target material is considerably higher than the stagnation pressure generated by corresponding continuous jet (Chapter 2).
"The shoes are very easy to balance in, safer than in-line skates, and they reduce the impact pressure of running, so they aren't jarring to the knees or back.
By ensuring that the upstream impact pressure signal is not biased by the pressure at a sensing port next to the output point, the meter is said to be less susceptible to the effects of non-ideal upstream pipe work configurations.
PPL says that one of the primary reasons why valves fail is the fissures brought on by repeated impact pressure. There are now applications where Victrex PEEK has passed up to 20 million impact cycles.
In addition, undernutrition and protein energy malnutrition can negatively impact pressure ulcer healing, all of which makes early identification and treatment of nutritional problems critical.
When it enters the atmosphere, impact pressure causes the body to heat up and emit light.
The second column for each coating was treated with the water jet for 10 s at a jet impact pressure of 18 kPa for C.
From 1 bar to 7 bar, an impact pressure nozzle blows a stream of air or inert gas down on the DUT from a controlled height, inducing a known pressure on the membrane of the device (Figure 1).