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Thermodynamics of gas exchange between gas cylinders

A synthesis gas mixture ($\text{H}_2:\text{CO}$ with molar proportion 2:1) is needed for methanol synthesis. The final mixture must be available in a gas cylinder of 50 L, say cylinder $M$, which contains, initially, pure $\text{H}_2$ at 5 bar. The…
Robert
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(de facto) Standards for freehand technical lettering?

What de facto standards or otherwise exist that prescribe a style for freehand technical lettering? With the ubiquity of CAD there is probably a diminished need for standardized handwriting. Technical lettering was not part of my undergraduate…
ebpa
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How can I translate a pressure boundary condition to a velocity boundary condition for incompressible, viscous flow?

I have been working with an old code for modeling incompressible, 2D viscous flow out of a tank to understand a chemical process. There isn't much documentation and I'm not a fluid dynamicist, so I have been trying to check that things are working…
Ant
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Difference between Precipitation Hardening and Tempered Martensite

The textbook "Materials Science and Engineering An Introduction" mentions that: "Precipitation hardening and the treating of steel to form tempered martensite are totally different phenomena, even though the heat treatment procedures are similar;…
zero
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Explanation of network interdiction in layman terms

I am trying to understand network interdiction. I have read these papers, but it is still hard to get a clear understanding of what it exactly means: Blind Network Interdiction Strategies - A Learning Approach Network interdiction – models,…
Master
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How to make a conductive paint over PDMS?

Conductive paint by conventional technique using gum and graphite powder does not stick to the PDMS surface and comes off once the paint dries. How else can I make a conductive connection over the PDMS surface so that it can stick to it nicely?
RTh
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Bedload discharge for canals of triangular cross-section

All the methods I know of for calculating bedload discharge are for canals of rectangular cross-section (constant depth of flow). The bedload is first computed for a unit of width (using the constant water depth) and then multiplied by the width.…
J. I.
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How to increase the speed of exhaust gas?

I have a tube, at the bottom of the tube is burning wood and an air inlet. How can i increase the speed of the exhaust gas coming out of the tube? I thought about "bottle-necking" the exhaust pipe to make it go faster (Bernoulli's principle) but is…
Mohdak
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What should be the angle of the motor to the base?

I have a boat that uses a propeler above the water. The propeler blows the wind to the back of the boat and it makes the boat go straight. There is one problem with this approach: I am using a big propeller and I need to move the motor high so the…
Samul
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Transparent, hard material that lets infrared through

I am trying to build a protective enclosure for Microsoft's Kinect v2, which emits (and perceives) IR in the 827–850 nm range. In order to fully enclose the device without blocking those signals, I need some transparent and hard material that will…
Kal
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Why are negative frequencies included in the nyquist plot?

What is the physical meaning of using negative frequencies while making Nyquist plots? I know that we do a mapping from $s-$ plane to $f(s)$ plane, and we move along a contour. What I don't get is that Is the Nyquist plot purely a mathematical…
Manish
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Determine the moment of inertia of a filled circular sector

Does anyone know how to determine the moment of inertia of the filled circular sector shown below? Apparently I have to use $dA=r\ d\theta\ dr$, $y= r\sin(\theta)$ and end up getting $I_x=\frac{r^4}{8}(\alpha-\sin(\alpha))$ But I have no idea how…
strateeg32
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Normalization and Non-Dimensionalization of a mass balance equation

I would like to ask what is the difference (if any) between normalization and non-dimensionalization. I will try to explain what I have done until now with an equation that I would like to work with and you can make your comments on this specific…
ASK22
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Working Out Shaft Torque in a Stirred Tank with a Cylindrical Cavern Formation (using a non Newtonian fluid)

Here is some background to the problem (in a stirred tank): "With yield stress non-Newtonian (viscoplastic) fluids, it is possible to generate an agitated volume around the impeller, defined as a cavern, surrounded by a stagnant region where the…
MathsIsHard
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PATRAN Order of Operations

To preface this question, almost all of my FEA experience has come from SolidWorks, so I haven't had to deal with these types of problems. I'm designing a truss structure in PATRAN composed of 1D line elements. At some point, I have to do the…
Anonymouse
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