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Questions tagged [fluid]

136 questions
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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
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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
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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
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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
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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
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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
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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
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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
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Where in a fluidic fitting does the seal form?

Kind of a basic question but I'm confused on where the seal is formed in a fluidic fitting (diagram below, source: Idex). I know as the nut is screwed in, the end of the ferrule contacts the receiving port, forcing the ferrule to compress against…
Vivek
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Two Definitions of Kinematic Viscosity and it's Importance in Engine Oils

I have come across two definitions of kinematic viscosity and I am wondering about their relationship and significance in engine oils. One definition describes kinematic viscosity as momentum diffusivity, while the other defines it as resistance to…
MechaTrex
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Airflow visible over the airplane wing

What's that visible airflow over the airplane wing and what causes it?
MechaTrex
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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
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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.
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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
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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
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