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3 votes

Where is the reaction force $F_2$ of $F_1$ applied?

Whenever in doubt, think fundamentally at a basic level. Clearly define the system that you are applying forces on. Case 1: Here the force on the escaping gas is applied by System 2. So, if system 2 ...
EagerToLearn's user avatar
3 votes

Transition from laminar to turbulent and vice versa

Disclaimer!!! Fluid dynamics may be counterintuitive, results are likely to be case-dependent, so that results for a flow can be hard to generalize to other flows; focusing on low-speed fluid ...
basics's user avatar
  • 8,671
0 votes

Will mass flow rate be the same in these tank-pipe-ideal fluid systems?

Your example illustrates how bad the "ideal fluid" approximation can be. For an ideal fluid (no viscosity), the velocity at the outlet will be the same in all three cases by Bernoulli's ...
pwf's user avatar
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2 votes

Continuity Equation for Steady State Flow vs Incompressible flow

Before answering your question, I'd suggest to review basics of differential calculus and operators, since your use of notation looks weak. Now, let's focus on your question, splitting the answer in ...
basics's user avatar
  • 8,671
0 votes

Modelling the number of times a gas tank can be filled

Theoretically, this seems perfect but in real world applications, there are some ramifications that you'd be facing. One of these is that the pressure regulator introduces a source of non-adiabaticity ...
Dinuwara Binudith De Silva's user avatar
0 votes

Why can't Rayleigh Flow admit total temperature ratios higher than 1?

The problem is that the upstream condidtions are affected by the heat addition. See Foa and Rudinger "On the Addition of Heat to a Gas Flowing in a Pipe at Subsonic Speed", Journal of the ...
W H G's user avatar
  • 401
0 votes

Why do jet engine vortices go toward the ground?

Technically, all tornadoes form horizontally in their early stages, then they're flipped over to the vertical orientation.
Costillo's user avatar
0 votes

Can the air have to travel slower than the aeroplane for the plane to experience a forward force?

When an aircraft is cruising with constant horizontal velocity, the force due the aircraft engines is balanced by the drag due to air resistance. The air resistance is a function of the velocity of ...
KDP's user avatar
  • 4,217
1 vote

Finite differencing for velocity cross terms?

Probably the most easy way to arrive at the finite difference scheme for a cross term is to separate the partial derivatives into two operations on the velocity (assuming forward differencing): $$\...
Kyle Kanos's user avatar
  • 28.3k
0 votes

Explaining lift on a wing via forces

As the wing moves forwards, it creates void of empty space behind it, on the topside of the wing. This is a low-pressure zone, which then pulls the air above the wing downwards. To see the full ...
Nick's user avatar
  • 1
1 vote

By how much does air resist a piston?

To answer the question in the title of this post: Every one of the air molecules which make up the bulk of the air next to the piston is flying through space and is bouncing around off its neighbors ...
niels nielsen's user avatar

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