8
votes
Can Siphoned water travel a distance of 2500 ft with a height difference of 10 ft?
As long as you can (1) set the free water surface of your destination at a lower level than the free water surface of your source, (2) use a completely sealed, air tight siphon, and (3) initially ...
- 652
5
votes
How do I connect a 3mm water tube to a plastic box?
If you don't care it being a little flimsy and just want quick, and the plastic is not too brittle:
Use a barbed fitting with a straight thread on the outside, e.g. #10-32 of M5x.8 (these sizes happen ...
- 1,387
5
votes
Accepted
Why do we need continuum approximation in fluid mechanics?
Materials were intuitively uniform for 60,000 years. A few people started guessing they might be "atomic" about 3000 years ago. They only became rigorously atomic about two hundred years ago....
- 4,607
4
votes
Designing for a specific flowrate
Many commercial hot water recirculation pumps will do that. Just grabbed one at random - Grundfoss Alpha1 15 40 130.
I couldn't fetch the page after I ran their calculator. I used temp of 99C and ...
- 4,607
4
votes
Accepted
Why is the direction of pressure always perpendicular to surface area for fluids?
This is actually something not easily answered because it is part of the definition of pressure. I will instead point you to other answers which hopefully make sense.
The following is an excerpt from ...
- 24.3k
4
votes
How do I connect a 3mm water tube to a plastic box?
If you don't want to drill a hole on the box and mess around with nozzles and sealants, a solution would be to siphon water like
The only difference is that that valve is going to be at the bottom ...
- 24.3k
3
votes
Velocity of Fluid Flow
If there are no losses and no storing between the beginning $A$ and the end $B$, you can calculate the velocities based on the principle of continuity.
$$ Q_A= Q_B $$
whereas in a homogeneous flow $Q$ ...
- 1,166
3
votes
Can Siphoned water travel a distance of 2500 ft with a height difference of 10 ft?
As mensioned above it works. You would need to make sure the level of discharge at your end is lower than the lowest seasonal level of the lake and also make sure it never gets submrged at your end to ...
- 22.1k
3
votes
Accepted
Losses through holes drilled in a pipe
So, I attempted to solve a simplified problem using Bernoulli, it is an approximation though, since it doesn't account for the change in flow direction and subsequent turbulence caused after the hole. ...
- 498
3
votes
Would an object at the bottom of the sea still experience buoyancy?
Yes your can will still have buoyancy when it is submerged to the bottom.
Regardless of the submersion depth, any object will lose weight equal to the weight of water it has displaced, even when held ...
- 22.1k
3
votes
fluid mechanics
P2 is given as atmospheric and P1 is given as a gauge pressure of 80kN/m^2.
The gauge is assumed to measure the pressure against atmospheric ie it could be a Bourdon tube type gauge.
Which means if ...
- 15.5k
3
votes
Accepted
Unequal water level in connected containers - Aquarium Sump
The pressure drop between the left and right sumps can be calculated by measurement. For fresh water 10 m = 1 bar (approx.) so 10 mm = 1 mbar (or just work in mm).
There are a several useful ...
- 10.4k
3
votes
Accepted
Does the aerodynamic force qualify as a viscous damping force in the Mechanical Harmonic Oscillator
The equation $F_{\textrm{A}} = C_{\textrm{D}}A\rho\dot{x}^2/2$ doesn't tell you that drag is proportional to the square of velocity. In itself, that equation doesn't tell you anything at all about ...
- 851
3
votes
Accepted
Triangle symbol in pneumatic diagrams
It is a two stage actuator where the triangle represents a pilot. That means that there is a pressure assist. The direction of the arrow indicates the direction of flow.
- 3,597
3
votes
Accepted
Airflow visible over the airplane wing
Specifically, what you are seeing here is a vortex which is basically a sideways tornado. Vortices occur when moving air forms a twisted stream when flowing over an object with a complicated shape. ...
- 14.3k
2
votes
How to calculate the volume capacity flow rate of a vertical pipe?
To estimate the frictional losses you can use the Darcy–Weisbach equation:
$$h_f = f_D \frac{L}{D} \frac{V^2}{2\,g}$$
This head-loss ($h_f$) can be added to Bernoulli's equation:
$$h - h_f = \frac{...
- 1,335
2
votes
Velocity of Fluid Flow
If a water pipe has a large diameter at the start and a small diameter at the end what part of the pipe would the water flow faster?
If there are no losses of the fluid between the wide point and the ...
- 31
2
votes
Would an object at the bottom of the sea still experience buoyancy?
I'm not sure why SolarMike deleted his response. The only thing holding the can to the ground ("proud" in naval terms) is the vacuum force, i.e. the same pressure that keeps you from lifting the can ...
- 4,199
2
votes
Would an object at the bottom of the sea still experience buoyancy?
This question is a theoretical/academic edge-case.
A body in the water will experience two forces:
Pressure acting on all surfaces in contact with water
Gravity acting on the mass of the body
The ...
- 1,192
2
votes
Would an object at the bottom of the sea still experience buoyancy?
Yes it will - the space the object occupies is lighter than the fluid around it so it wants to rise.
Same as pushing a ball to the bottom of the bath - does it stay there?
Edit: for those who say ...
- 15.5k
2
votes
Methane Gas Density in Adiabatic Compressible Flow
The text book answer is correct.
I think you missed to calculate the density of the downstream of the shock.
the equation you entered is valid only in the region 1 or in region 2. means the ...
- 486
2
votes
Can Siphoned water travel a distance of 2500 ft with a height difference of 10 ft?
I'm going to suggest that use of a siphon-based system is just plain unworkable here. What you need is a pipe permanently installed in or below the lake bottom, with a good filter at the inlet end, ...
- 4,199
2
votes
Measuring viscosity with tools other than viscometer
A long glass tube and a steel ball which matches the internal diameter closely - then measure the different times compared to some known liquids for the ball to drop a given distance.
- 15.5k
2
votes
Measuring viscosity with tools other than viscometer
punch a small hole in the bottom of a plastic container. measure the time it takes for the container to empty through the hole. experiment with different hole diameters to "scale" the effect ...
- 14.3k
2
votes
Unequal water level in connected containers - Aquarium Sump
There must be pressure ( water level) difference to provide force to push water through the system. If you stop input and output for a few minutes the levels will even out , except where a baffle may ...
- 6,112
2
votes
At what volume would air bubbles become static in a fluid with viscosity of 7000cps
TL; DR: this is actually complicated and I don't know if your question can really be answered.
The movement of (practically) spheres in a fluid, you can use Stoke's law for very low Reynolds numbers, ...
- 4,772
2
votes
Accepted
Work calculation in a thermodynamics cycle process
Why won't we simply add work calculated in each process of a
cycle,like in Carnot: W1 + W2 + W3 + W4
We can (But you need to be careful in calling energy of each process as work, $W_1$ & $W_3$ as ...
- 2,160
2
votes
Accepted
Why does this glass tend to stick on surfaces
The surface of C where the glass sat is smooth, then the glass may have a slightly concave bottom and the water, with capillary action, managed to form a seal between the two surfaces. Even if the ...
- 15.5k
2
votes
How do you imagine momentum?
@JonathonRSwift provided a good analogy for momentum using a rugby player or a child running at and into you. The rugby player would likely bowl you over while a child even moving at twice the speed ...
- 496
2
votes
How do you imagine momentum?
The mass has a fundamental property and that is like a battery that can be filled with the charge and become a container of energy, mass by virtue of its inertia can accept the work of a force F ...
- 22.1k
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