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hydraulic head
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What is piezometric pressure?
Piezometric pressure is the simplest form of the hydrostatic equation in fluid mechanics. Simply put, the hydrostatic equation is the following: P + (gamma)*z = constant (I apologize but I wasn't able to insert greek letters.) where, P = pressure. gamma = specific weight (assume constant; fluid is incompressible unless it is a gas) z = sometimes called piezometric head or pressure head. It is simply the elevation or the vertical distance (height) from a fixed reference point called a datum. The whole left side expression of the equation is the piezometric pressure, Pz In order to use this equation in fluid mechanics, you must define 2 points of analysis and plug the variables. P1 + [(gamma)*z1] = P2 + [(gamma)*z2] When dealing with a fluid in motion, however, the piezometric pressure is no longer constant in the system. Partial derivatives and acceleration get involved. The resulting equation is know as Euler's Equation. Hope this is enough help!
How do you calculate pressure ratio of compressor?
Inlet pressure/discharge pressure
What pressure is medium pressure natural gas supplied?
medium pressure
What is difference between pressure reducing valve and pressure relief valve?
pressure relief valve relief the excess pressure which is developed in the syatem, while pressure reducing valve reduces the pressure and supply it to the system.
What is the Difference between an active earth pressure and passive earth pressure?
When the wall moves away from the backfill, the earth pressure on the wall decreases. This minimum pressure is called active earth pressure. On the other hand if the wall moves towards the backfill, the earth pressure increases. This maximum pressure is called passive earth pressure.
What is piezometric pressure?
Piezometric pressure is the simplest form of the hydrostatic equation in fluid mechanics. Simply put, the hydrostatic equation is the following: P + (gamma)*z = constant (I apologize but I wasn't able to insert greek letters.) where, P = pressure. gamma = specific weight (assume constant; fluid is incompressible unless it is a gas) z = sometimes called piezometric head or pressure head. It is simply the elevation or the vertical distance (height) from a fixed reference point called a datum. The whole left side expression of the equation is the piezometric pressure, Pz In order to use this equation in fluid mechanics, you must define 2 points of analysis and plug the variables. P1 + [(gamma)*z1] = P2 + [(gamma)*z2] When dealing with a fluid in motion, however, the piezometric pressure is no longer constant in the system. Partial derivatives and acceleration get involved. The resulting equation is know as Euler's Equation. Hope this is enough help!
What is the name for the imaginary line on the same plane as the level of the surface of an open container of water used as a reference for determining elevation head?
The answer to that question is " Piezometric plane". Though in reality the correct definition of Piezometric plane is actually "The equivalent elevation head (EH) of water at the point force is measured", what they are talking about when they say "equivalent" is that imaginary line.
What are the types of piezometers?
A piezometer is a small diameter water well used to measure the hydraulic head of groundwater in aquifers. Similarly, it may also be a tube or manometer used to measure the pressure of a fluid at a specific location in a column. Piezometers should ideally have a very short screen and filter zone, so that they can represent the hydraulic head at a point in the aquifer. If the filter zone is located at a specific isolated depth, the piezometer is defined punctual, or, if the piezometer has a filter on all its length, is defined windowed. The windowed piezometer is cheaper than the punctual one, but cannot give information on vertical flows. The main problem with the piezometers is the time-lag between the variation of piezometric level in the aquifer and the respective variation in the piezometer. This time-lag is related to the piezometer (type, shape, etc.) and the soil. Modern piezometers with little time-lag are the piezometric cells, where the pressure on a membrane is measured by the pressure of gas (pneumatic piezometric cells), by vibrating thread extensimeters or by electrical extensimeters (strain gauges piezometers). Source: http://www.answers.com/piezometers?gwp=11&ver=2.3.0.609&method=3
What is the surface between the zone of aeration and the zone of saturation called?
The Water Table. The term Piezometric, or sometimes Potentiometric, Surface occurs in literature on hydrology but describes an artificial level in a well or borehole, used for measuring the aquifer.
What is the best system for water hammer protection in larger diameter pipes?
The water-hammer in a pump systems is created in the pump zone, so the best way to attack the negative wave pressure that will born there (and travel along the pipe, back and forth) is by injecting fluid, so that it counteracts the fall in the pressure in a good deal. This has no relation to the diameter of the pipe. Of course, the larger the diameter, the more water will have to be injected, but it won´t change your protecting device. The only ones who inject water as soon as the water hammer occurs are the pressure vessels and an air chamber (open to atmosphere), as long as the latter is located at the pump zone. But for this it would have to very high (for the water level in it to reach the piezometric line since its open to atmosphere) leaving it as a non-usual option. That´s why pressure vessels are so used.
What is the area immediately below the water table?
The water surface is called the Piezometric Surface - though I invite clarification as I believe this has a definite meaning within hydrology and geology. The water-bearing formation is the Aquifer or Saturation Zone generally, the Phreas in karst hydrology/geology.
What is the difference between energy line and energy grade line?
Difference between energy line and energy grade lineThe line showing the total energy at any point in a pipe. The total energy in the flow of the section with reference to a datum line is the sum of the elevation of the pipe centerline, the piezometric height (or pressure head), and the velocity head. The energy grade line will slope (drop) in the direction of flow except where energy is added by mechanical devices. The line representing the elevation of the total head of flow is the energy line. The slope of the line is known as the energy gradient
Is absolute pressure static pressure?
absolute pressure
What does absolute pressure include that gauge pressure does not?
abosulute pressure includes the atmospheric pressure while gage pressure gives the pressure above atmospheric pressure
How do you calculate suction pressure for air theoretically?
Air has a pressure, but not a suction pressure. Air pressure is measured with a barometer, you do not calculate it. Suction pressure is a concept which applies to a pump. Suction pressure = static pressure + surface pressure - vapour pressure - friction pressure.
When you take a persons blood pressure it is a reflection of lymphatic pressure arterial pressure osmotic pressure or venous pressure?
arterial pressure
What is the relation between pressure in atmosphere and pressure?
Atmospheric pressure is the surrounding pressure around us. We live in the atmosphere and treat the atmospheric pressure as the base pressure. A pressure gauge would read 0 at atmospheric pressure. When we define the pressure in scientific way of absolute pressure, we need to add up an atmospheric pressure to the measured pressure.
