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Fluid dynamics of non interacting tanks in series

I have a system like this: and I have to estimate the height of the lower tank. First of all, I'm considering that I have a non-viscous, incompressible fluid in steady flow. Base apertures The outlet velocity of liquid when draining a tank or a…
Unnamed
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Is there a difference between punching shear for columns on slabs vs slabs on columns?

Might there a difference in design approach for punching shear for the two scenarios? Or something to pay particular attention to? Is the slope of the shear plane (normally 1:1) the same for both scenarios? I would assume that it is, since the two…
SlydeRule
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Do heat pipes work in any orientation?

I think I understand how heat pipes work, and thus the following one has me flummoxed:- It's from a typical bulk order Chinese web site, but I've seem many similarly contorted arrangements. They are very common in the over clocking /modding…
Paul Uszak
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Improvements in ammunition design?

In a news article today the reporter claims that modern improvements in "ammunition design" have made long rife barrels unnecessary for assault weapons. Here is the paragraph: The 20-inch barrel isn’t needed anymore. One of the biggest differences…
Wallace Park
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Stylus Materials

I'm trying to design a stylus for use with multiple touchscreen technologies, but I'm not sure what materials I should start with (specifically for the tip). Right now I'm investigating a few materials, but I'd like more background on how other…
Chthonus
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Can air suction be increased by consecutive pc fans in small air tunnel?

I want to make a small air filter using standard axial pc fans in order to suck smoke like that have been produced in soldering process. But I assume filtering will make it difficult. Am i wrong? The air have to be forced through the granulated…
Alnus
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What kind of simplified structural system would a Leonardo bridge use?

What kind of simplified structural system would a Leonardo bridge use? I've tried approximating the system to a simple statically determined beam (see below) but our calculations did not give any realistic results. I believe it is due to a…
JLenz
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How to measure turbulence parameters experimentally?

When running CFD simulations with turbulence on, I often need to specify inlet parameters such as the turbulent intensity, turbulent viscosity ratio and/or the turbulent length scale. If these parameters are already known for a given experiment, I…
Paul
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Rule of thumb maximum flow velocity of water in pipes

I have come across various values for maximum flow velocity of water in pipes. At university we were told that 2 m/s is the upper limit where flow becomes turbulent. In various planning reports I have read recently, 1 m/s is stated as the upper…
SlydeRule
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Advantages/Disadvantages of two-bladed windmill?

The vast majority of wind turbines I have ever seen feature 3 blades, as shown here: Recently while driving through western new York state, however, I passed by several turbines featuring only two blades, as shown here: What advantages and…
Timpanus
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What's more energy efficient: fewer air conditioners working at max capacity or more working at part capacity?

The central heat and air in the house I'm renting is unable to keep the house below 80 °F during the hot summer here (100 °F days). We've had 3 HVAC techs out to look at it and they all say there's "nothing wrong with the system" and that it's…
Dennis
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How can I add roof-mounted solar panels to a van without making it unstable at highway speeds?

We have an extended Chevy express with a 24" high-top, on which we intend to install roof-mounted PV. I'm really concerned with how to properly install the panels. We've selected six 100 W Renogy panels and a 400 Ah LiFePO4 battery pack, but it…
Liandri
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When are overshooting controllers preferred over asymptotic ones?

Disclaimer Designing the behavior of controllers is an important task for many applications. Every application needs its own requirements fulfilled. For example a CNC machine needs a controller with a strict asymptotic convergence to the set value.…
solid
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Is steel air (argon) tight?

I need to build an air tight system that can hold gas (Argon Gas). I see that most pipes use steel. Is steel tight enough to hold that gas? Argon is very dense, so I think it should have no problem.
LostPecti
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Steel vs Bamboo strength types/ weight and in various directions & orientations? Specific, Tensile, Compressive, Shear, Lateral etc?

Why bamboo is the ‘green steel’ of 21st-century Asian architecture Bamboo fibre is stronger and cheaper than steel, says Dirk Hebel Carbon Fiber Vs Steel Vs Aluminum Vs Bamboo Pros and Cons Is bamboo stronger than steel? How are their comparative…
Alex S
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