Another "myth to kill"??.....what makes it go???

[Egon]

If you want to know which way the effluent is flowing, just look down the pipe when flushing.

I see or is it understand.:thumbsup:

 

[AKKAMAAN]

..... one could push on a rope!:ashamed:

Pull or push doesn't matter, both are about applying FORCE...

You can push on a rope if you spray it with hair spray....stiff grade....

 

[Egon]

spray it with hair spray....

What would I have Hair spray For??:laughing:

 

[AKKAMAAN]

What would I have Hair spray For??:laughing:

stiffen the rope....so you can push it....:thumbsup:

 

[gpflepsen]

Interesting comments in this one.

In some world of dynamic modeling, pumps supply the work, or the potential to do work. In the case of positive displacement pumps (most of the hydraulic pumps we are familiar with) these are merely sources of flow. They turn and can only produce flow. More correctly, they have to produce flow. This flow is directed anywhere we want to take it, but it must go somewhere. When this flow meets resistance (i.e. a cylinder/motor/hose resistance/flow orifice) or a capacitance (accumulator) a pressure is produced proportional to the characteristic of the "load". Velocity (flow rate) is a given and pressure is determined by the outside influences. So, flow makes it go.

Conversely, centrifugal pumps are purely sources of pressure. The pressure potential is a function of the speed of the pump's impeller. This pump can only produce flow if the "loads" are sized such that the reaction is less than the pumps developed head. The pump's speed can control the pressure but the flow is conditional on the resistance seen. So, in this case, pressure makes it go.

 

[AKKAMAAN]

Interesting comments in this one.

In some world of dynamic modeling, pumps supply the work, or the potential to do work. In the case of positive displacement pumps (most of the hydraulic pumps we are familiar with) these are merely sources of flow. They turn and can only produce flow. More correctly, they have to produce flow. This flow is directed anywhere we want to take it, but it must go somewhere. When this flow meets resistance (i.e. a cylinder/motor/hose resistance/flow orifice) or a capacitance (accumulator) a pressure is produced proportional to the characteristic of the "load". Velocity (flow rate) is a given and pressure is determined by the outside influences. So, flow makes it go.

Conversely, centrifugal pumps are purely sources of pressure. The pressure potential is a function of the speed of the pump's impeller. This pump can only produce flow if the "loads" are sized such that the reaction is less than the pumps developed head. The pump's speed can control the pressure but the flow is conditional on the resistance seen. So, in this case, pressure makes it go.

Newtons first law of motion states:
"Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it."
This means that, to displace (move) an object, a force have to be applied.
A hydraulic system consists of a prime mover that converts electricity or fuel? into, usually rotating, mechanical energy. A person can be a prime mover in a hydraulic system, using a hydraulic jack .
There are a few different mechanical ways to transfer this mechanical force, to an actuator, where the work needs to be done.
We start with a simple object that need to be moved, a cubic shaped box. We apply a force to the side of the box. When force is big enough to overcome the force of friction, the object will start moving (accelerating).
We can now add distance between the prime mover and the object and let a piece of lumber or a bar made of steel etc, transfer the force from the prime mover to the object. The result will basically be the same; the applied force will make the object move.
Even if we stick the steel bar through a tube or hose, the result will be the same; the applied force will make the object move.
Now if we replace the steel bar with a liquid, and a cylinder with a pump piston in the prime mover end, and a work cylinder with a piston in the actuator end, the fluid will fill the same purpose as the steel bar, it is there to transfer force.
Now, scientists have complicated things, by breaking down the applied force in a liquid into something called pressure. Pascals law states:
"Pressure exerted anywhere in a confined incompressible fluid is transmitted equally in all directions throughout the fluid."
This means that if we apply a force on a limited area, pump piston, in the confined fluid, we create a pressure that will be equal, trough out the whole confinement. This pressure can react on another limited area, cylinder piston, and create a force that can displace the object.
In this discussion we havent mentioned f��low one single time, and we have proofed that it is the f��orce (pressure) that makes it go? Newtons first law applies!
Flow is a hydraulic parameter that describes the volume of fluid that is passing a certain cross section of the fluid confinement, within a certain time unit.
Flow is part of the moving linkage, but flow is not what makes it move.
The myth is dead!!

 

[gpflepsen]

Newtons first law of motion states:
"Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it."
This means that, to displace (move) an object, a force have to be applied.
A hydraulic system consists of a prime mover that converts electricity or fuel? into, usually rotating, mechanical energy. A person can be a prime mover in a hydraulic system, using a hydraulic jack .
There are a few different mechanical ways to transfer this mechanical force, to an actuator, where the work needs to be done.
We start with a simple object that need to be moved, a cubic shaped box. We apply a force to the side of the box. When force is big enough to overcome the force of friction, the object will start moving (accelerating).
We can now add distance between the prime mover and the object and let a piece of lumber or a bar made of steel etc, transfer the force from the prime mover to the object. The result will basically be the same; the applied force will make the object move.
Even if we stick the steel bar through a tube or hose, the result will be the same; the applied force will make the object move.
Now if we replace the steel bar with a liquid, and a cylinder with a pump piston in the prime mover end, and a work cylinder with a piston in the actuator end, the fluid will fill the same purpose as the steel bar, it is there to transfer force.
Now, scientists have complicated things, by breaking down the applied force in a liquid into something called pressure. Pascals law states:
"Pressure exerted anywhere in a confined incompressible fluid is transmitted equally in all directions throughout the fluid."
This means that if we apply a force on a limited area, pump piston, in the confined fluid, we create a pressure that will be equal, trough out the whole confinement. This pressure can react on another limited area, cylinder piston, and create a force that can displace the object.
In this discussion we havent mentioned f瑞low one single time, and we have proofed that it is the f瑞orce (pressure) that makes it go? Newtons first law applies!
Flow is a hydraulic parameter that describes the volume of fluid that is passing a certain cross section of the fluid confinement, within a certain time unit.
Flow is part of the moving linkage, but flow is not what makes it move.
The myth is dead!!

Riddle me this...

Say I have a reservoir of fluid which I can vary the height above ground. This reservoir is connected via hose to a hydraulic cylinder. This cylinder is connected to a load of some kind, say a block on the ground. To make the block move, I'll have to raise the tank to a sufficient height to produce the pressure to overcome the friction... then the block will move. I am supplying pressure which results in motion (or flow). Ergo, pressure makes it go. Say the Pressure-Flow interaction is a linear relationship with friction,


Flow=Pressure/Friction



Here Flow is a function of the pressure, that is the pressure dictates (is in charge of) the motion. The myth is dead!

Take the tank in the example above and replace it with a positive displacement pump (spinning at a constant speed) providing a constant flow. The relationship between the motion and the pressure then becomes



Pressure=Flow x Resistance.



In this case, the pressure is a function of the Flow, i.e. the Flow dictates the pressure. The myth is alive! The flow made it go!

The two examples above are different. One has an input of flow and the other has an input of pressure. The myth is... well it depends!

 

[Redneck in training]

Riddle me this...
Pressure=Flow x Resistance.

In this case, the pressure is a function of the Flow, i.e. the Flow dictates the pressure. The myth is alive! The flow made it go!

The two examples above are different. One has an input of flow and the other has an input of pressure. The myth is... well it depends!

There is something wrong with above equation. More flow equals less pressure. The equation should be Pressure=Resistance/Flow.

 

[AKKAMAAN]

Riddle me this...
Say I have a reservoir of fluid which I can vary the height above ground. This reservoir is connected via hose to a hydraulic cylinder. This cylinder is connected to a load of some kind, say a block on the ground. To make the block move, I'll have to raise the tank to a sufficient height to produce the pressure to overcome the friction... then the block will move. I am supplying pressure which results in motion (or flow). Ergo, pressure makes it go. Say the Pressure-Flow interaction is a linear relationship with friction,

Head pressure or pressure from a prime mover powered pump does not matter PRESSURE=PRESSURE

Flow=Pressure/Friction

Please back this one up!!
In metric system I'll tell you what you just said....
Flow unit = m3/s
Pressure unit = N/m2
Friction or resistance is equal to force, actually opposing force...unit=N

so here is your equality, and I'll simplify it for you too

m3/s =(N/m2)/N
simplified step 1
m3/s=1/m2
simplified step 2
m3 x m2 x s/s = m2/m2 x s
simplified step 3
m5=s
"m5" equals time???????

Here Flow is a function of the pressure, that is the pressure dictates (is in charge of) the motion. The myth is dead!

Take the tank in the example above and replace it with a positive displacement pump (spinning at a constant speed) providing a constant flow. The relationship between the motion and the pressure then becomes



Pressure=Flow x Resistance.



In this case, the pressure is a function of the Flow, i.e. the Flow dictates the pressure. The myth is alive! The flow made it go!

The two examples above are different. One has an input of flow and the other has an input of pressure. The myth is... well it depends!

:confused2::confused2::confused2:

Come back after you have "backed up" that formula statement

 

[AKKAMAAN]

There is something wrong with above equation. More flow equals less pressure. The equation should be Pressure=Resistance/Flow.

Pressure=Resistance/Flow
N/m2=N/(m3/s)
Simplified step 1
m3 x N/m2 /(N)=N x m3/(N x m3/s)
Simplified step 2
m = s
"distance" equals "time"?????

Nope that didn't work either....back to class.....:laughing: