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Slow motion video of a fruit falling into water. In fluid mechanics, a splash is a sudden disturbance to the otherwise quiescent free surface of a liquid (usually water).The disturbance is typically caused by a solid object suddenly hitting the surface, although splashes can occur in which moving liquid supplies the energy.
If the moving water is suddenly stopped, such as by closing a valve downstream of the flowing water, the pressure can rise suddenly with a resulting shock wave. In domestic plumbing this shock wave is experienced as a loud banging resembling a hammering noise. Water hammer can cause pipelines to break if the pressure is sufficiently high.
A pressure drop as small as 100 Torr (13 kPa), which produces no symptoms if it is gradual, may be fatal if it occurs suddenly. [77] One such incident occurred in 1983 in the North Sea , where violent explosive decompression from nine atmospheres to one caused four divers to die instantly from massive and lethal barotrauma . [ 79 ]
Based on observations in the field, Pyle (2001) has hypothesized that some behavioural factors at the end of deep technical dives may influence decompression stress and the risk of developing symptoms shortly after exit from the water. [71] Sudden drop in ambient pressure during an ascent to the surface from a 6 m final stop on oxygen.
When fire hydrants ran dry, the L.A. Department of Water and Power struggled to get water where needed. The utility's operations chief explains the decisions as the fire spread.
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Pressure drop (often abbreviated as "dP" or "ΔP") [1] is defined as the difference in total pressure between two points of a fluid carrying network. A pressure drop occurs when frictional forces, caused by the resistance to flow, act on a fluid as it flows through a conduit (such as a channel, pipe , or tube ).
A sudden flow expansion. The Borda–Carnot equation is applied to the flow through a sudden expansion of a horizontal pipe. At cross section 1, the mean flow velocity is equal to v 1, the pressure is p 1 and the cross-sectional area is A 1.
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