Questions tagged [fluid-dynamics]
The quantitative study of how fluids (gases and liquids) move.
7,225 questions
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Velocity of efflux when the area of hole is equal to the cross sectional area of the container
From the equation of continuity and Bernoulli's theorem a formula can be derived for the velocity of efflux when it flows from a hole of area "a" such that the cross sectional area of the ...
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Squire’s article “The Round Laminar Jet”
I was reading the article "Round Laminar Jet" by H.B. Squire about the Landau jet (for which I can't provide free access, sadly). It models a fluid being discharged into a space containing ...
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Siphons and chain fountain [closed]
Let's say there are two beakers, A and B, placed at different heights (A is placed higher than B).
A siphon works like this. Fill a tube with water and connect A to B. Think of the tube as two columns:...
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Determining depth of seabeds near shore using waves characteristics
Shoaling wave height increases as waves come closer to the beach. By using this property of the wave, it is possible to find the depth of the seabed close to the beach(between when the shoaling of the ...
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Are these two expressions of the Poiseuille equation equivalent?
My textbook shows the Poiseuille equation as $$Q=\frac{\pi R^4\Delta P}{8\eta\ell}$$ I rewrote it as $$\frac{\mathrm{d}V}{\mathrm{d}t}=\frac{\pi R^4}{8\eta}\nabla P\cdot\hat{\mathbf{v}}$$ where $\hat{\...
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Flowrate of gas (Mach no. greater than one) through an isentropic conduit
The text (Unit operations in chemical engineering by McCabe, Smith, Harriot) suggests that for flow through isentropic conduit flow rate achieves maxima at throat and then doesn't change. The reason ...
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Low Mach number expansion
I'm reading the article "Lattice-Boltzmann Simulations of Particle-Fluid Suspensions"
by A. J. C. Ladd and R. Verberg.
In section 5.4 ("Limiting Cases"), the authors note that in ...
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Do fluid streams attract each other ("pinch" or bundle together)?
Do fluid streams (air coming out of two jet engines, one on each wing; hot gas coming out of multiple rocket nozzles, etc.) attract one another ("pinch" or bundle together)?
cf. History of ...
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Wood fired pool heater set up- [duplicate]
Closed. This question is off-topic. It is not currently accepting answers.
This question appears to be about engineering, which is the application of scientific knowledge to construct a solution to ...
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How can I use Bernoulli’s principle to measure fluid height and energy?
I’m trying to do a small experiment to understand Bernoulli’s principle.
I want to measure how the height of a fluid in a pipe relates to its energy or pressure. I’m not sure:
How to set up the ...
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Pressure conflict when priming a siphon: 1m water column vs. 20cm tank level
I have a question about fluid dynamics that is causing some confusion for me. It relates to the pressures at play when priming a siphon.
The Setup:
Imagine two identical tanks, Tank A and Tank B.
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Is shear stress really zero for a fluid in accelerating container?
I am really confused, about the nature of inviscid fluid.
That is
A fluid cannot resist a shear stress.
The confusion seems to arise when we accelerate a fluid like this:
You can see the fluid is ...
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Confusion in Pitot stagnation pressure $(½)ρV²$ with momentum-flux pressure $ρV²$: control-volume derivation and instrumentation implications [closed]
When a Pitot tube faces a uniform incompressible flow we obtain the usual Bernoulli result for stagnation pressure:
$p_{0} - p_{\infty } = (1/2)\rho v_{\infty }^{2}$
so the Pitot gives the dynamic ...
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How much does air in a vehicle dampen the feeling of acceleration?
You're standing on a train. The train starts suddenly, your feet are on the floor so they start moving with the train but the rest of you doesn't. You stumble back a step and catch your balance as ...
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How does static pressure increase from flow turning differ between subsonic and supersonic cases?
When subsonic flow encounters an object (e.g. a wedge airfoil), the flow gradually turns to follow the surface. Because pressure disturbances can propagate upstream, the flow adjusts smoothly, leading ...
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