Engineering Stack Exchange
Engineering Stack Exchange

Questions tagged [fluid]

112 questions
12
votes
4 answers

Would an object at the bottom of the sea still experience buoyancy?

So I understand that buoyancy happens because the fluid exerts larger amounts of pressure from beneath an object compared to above, like in this picture So my question is, what if the object is forced to the bottom of the container, so that no…
M. Wother
  • 361
  • 2
  • 8
4
votes
3 answers

Why do we need continuum approximation in fluid mechanics?

We know that a fluid in reality is not continuous. It has spaces and voids between atoms and molecules. Continuum approximation is a famous approximation that is taken in any fluid mechanics textbook. It says that even though the fluid has spaces…
Harshit Rajput
  • 861
  • 3
  • 18
4
votes
1 answer

How to calculate the volume capacity flow rate of a vertical pipe?

There is a rain pipe in a house. I want to know how many cubic meter rain water can flows through the given pipe in a minute. I need to know the maximum capacity of the pipe. In other words: How many liter water can pass through this pipe in one…
Solarinoos
  • 141
  • 1
  • 3
4
votes
1 answer

Losses through holes drilled in a pipe

I asked a previous question about pipe t-junctions with pipes of varying diameters, and it got me wondering... How are losses handled and calculated in pipes with holes drilled directly into them? Flow runs perpendicular to the hole and most of the…
Petrichor
  • 498
  • 6
  • 21
4
votes
1 answer

Methane Gas Density in Adiabatic Compressible Flow

Hi.. The question above is one of the tutorial question from fluid mechanics textbook. In the textbook solution for this question, the density of the methane gas stream at downstream was computed with the ideal gas law equation. What I don't…
Daozui
  • 51
  • 2
3
votes
2 answers

How do I connect a 3mm water tube to a plastic box?

I need to connect a 3mm inside-diameter tube from a solenoid valve to a plastic box. The box wall thickness is 4.5mm. The purpose is to empty water in the box when needed. How should I connect it so that it is water-tight (very low pressure - around…
keble
  • 41
  • 3
3
votes
0 answers

What is the purpose of the ink delivery disks found in most rollerball pens

See picture. In most rollerball pens there are those peculiar looking disks near the nib, the purpose of which I have not yet figured out, apart from being some kind of ink reservoir/flow control. Non-uniform separation between the disks: The…
Chern-Simons
  • 131
  • 4
3
votes
1 answer

Buckingham-Pi Dimensional Analysis when there is a non-dimensional parameter: How is it accounted for?

I am in the process of completing a design project for my fluids course in which Buckingham-Pi /Dimensional Analysis is needed to find the optimal parameters needed to achieve a rotational rate of 120 rpm. So the question at hand is that the…
John Giannopoulos
  • 31
  • 1
2
votes
0 answers

Consistent Fluid or powder flow through an orifice

This is a really odd and specific question, and I'm not sure this is even where to ask. A few weeks ago I thought about making a clock based on water flowing from an orifice. The obvious issue is that the flow rate would vary significantly based on…
Austin Fox
  • 53
  • 6
2
votes
2 answers

If a gas is pushed through a widening section of a pipe with a piston, will the pressure increase?

Imagine I have a section of pipe that increases in cross-section at some point. If the gas in the pipe before this section is being displaced with a piston, will the gas increase its pressure and reduce its velocity while going through increasing…
Francis L.
  • 368
  • 2
  • 10
2
votes
1 answer

Work calculation in a thermodynamics cycle process

To calculate work in a cyclic process (say Carnot cycle) we find area under p-v curve,or use net heat transfer= net work done. Why won't we simply add work calculated in each process of a cycle,like in Carnot: W1 +W2 +w3 + w4
Millie
  • 319
  • 1
  • 6
2
votes
1 answer

Does the aerodynamic force qualify as a viscous damping force in the Mechanical Harmonic Oscillator

When reading about a harmonic oscillator, the most common form of damping is proportional to the velocity. $$F_D = c \;\dot{x}$$ Without giving much thought to viscous damping, one example I always thought of is the following. Taking my hand…
NMech
  • 23,917
  • 2
  • 30
  • 72
2
votes
1 answer

At what volume would air bubbles become static in a fluid with viscosity of 7000cps

I would appreciate any help with this as its been a few years since my fluid dynamics courses at University! Basically I am trying to determine the cause of voids that we are seeing in a set resin. There are a multitude of other influences at play…
A2son
  • 21
  • 1
2
votes
1 answer

Water & plumbing pipes vs gravity or air pressure

I'm sure there is a simple answer here, so I apologize in advance for the unchallanging & low level question, but here it is:  Why does the water at water oulets, through out a building, stop their water flow near instantly when the Rising Stem Gate…
Max R.
  • 21
  • 3
2
votes
0 answers

Fluid for mechanical lubrication and hydraulic connection to plastic/rubber parts

I have a piston made of anodized aluminium and stainless steel with nitrile seals which I need to connect hydraulically to our system which mainly consists of silicone rubber with polycarb and acrylic parts, but I'm having problems finding a fluid…
Oliver Walters
  • 321
  • 1
  • 6
1
2 3 4 5 6 7 8