But in the case of reaction turbines, if the net head is low and if the turbine is installed above the tail race, there can be appreciable loss in available pressure head.
32.
The lower pressure tail of an exhaust pulse then serves to create a greater pressure difference between the high pressure head of the next exhaust pulse, thus increasing the velocity of that exhaust pulse.
33.
In a venturi flow meter, the " differential pressure head " can be used to calculate the " differential velocity head ", which are equivalent in the adjacent picture.
34.
See Pressure head for more details . ) In open channels, it is assumed that changes in atmospheric pressure are negligible, therefore the pressure head term used in Bernoulli s Equation is eliminated.
35.
By placing a diffusing pipe at the exit of the runner, the pressure head is increased by decreasing the exit velocity, and both the overall efficiency and the output of the turbine can be improved.
36.
A "'cone of depression "'occurs in an aquifer when groundwater is pumped from a artesian ), the cone of depression is a reduction in the pressure head surrounding the pumped well.
37.
For a relatively incompressible fluid such as water, TDH is simply the pressure head difference between the inlet and outlet of the pump, if measured at the same elevation and with inlet and outlet of equal diameter.
38.
Zhang Heng was also the first to address the problem of the falling pressure head in the inflow water clock ( which gradually slowed the timekeeping ) by setting up an additional tank between the reservoir and inflow vessel.
39.
Water in the vadose zone has a pressure head less than atmospheric pressure, and is retained by a combination of adhesion ( " funiculary groundwater " ), and capillary action ( " capillary groundwater " ).
40.
So, for example, pressure head might be written " 742.2 mm Hg " or " 4.2 in H 2 O at 59 �F " for measurements taken with mercury or water as the manometric fluid, respectively.
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