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Otto Cycle Efficiency

A two-stroke engine equipped with a single cylinder having a bore of 12 cm and a stroke of 50 cm operates on an Otto cycle. At the beginning of the compression stroke air is at 100 kPa, 25 ℃. The maximum temperature in the cycle is 1100 ℃ . Use the…
Chris
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A material to insulate a container so that water inside the container is not affected by microwaves?

I'm running an experiment and I need to have a container filled with water. The container will be placed inside a microwave oven, but I need to minimize any effect the microwaves will have on the water. How can I go about running my experiment? I'm…
Robin Alvarenga
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How do I cut a crack into a polymer/plastic?

We need to cut a very thin crack into a polymer plate for a research project. The closest thing to what we are looking for is Wire EDM but since the polymer we are using is not conductive we cant use that method. Any suggestions? Is there an…
Murad Nazari
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How does a union joint with two male threads work?

How does union joint with two male threaded ends work? Does one male end rotate 360 degrees around it axis? How is the inside of the union constructed? Can I connect two pipes with female threads using a union joint and assemble/disassemble it…
Sysrq147
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What diameter hole will a twist drill bit of a given size actually make in a piece of metal?

I have a piston of diameter 0.7 mm exactly and a 0.7 mm drill bit. Let's call the diameter of the piston $r_1$, the diameter of a hole at the end of a tube $r_0$, and the final-actual diameter of the tube hole $r$. Then with fluid being pushed by…
Daniel Donnelly
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How can I cheaply drill a 0.1 mm hole in a small piece of tungsten?

I have a 10 mm diameter rod of 99.5% pure tungsten that I want to drill a 0.1 mm hole in using my Grizzly G0768 lathe. The hole only needs to be between 0.1 mm and 1 mm deep and is for a 3D printer hot nozzle. I don't know if this will break the bit…
Daniel Donnelly
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Do ships powered by nuclear reactors use water for shielding?

On a different Stack, I encountered an answer that was making a comparison to nuclear powered naval ships. It was stated that the physical shielding being used was various kinds of metals. This seems... odd to me. I assume that water is probably…
Ellesedil
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Accidental Torsion and Equivalent Static Load for an irregular structure

Important note: I am writing a structural FEM software from scratch, so I won't able to use existing commercial FEM package. I would need to know how all the important quantities are calculated from the first principles. I would need to determine…
Graviton
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Why does my model of a wind turbine show high RPM with low power output?

I am designing a wind turbine to generate 1300 W. I modeled the output voltage of an AC generator using the following specifics: Number coil turns = 300. Copper wire gauge = 1.02 mm. Knowing the density of copper, I calculated the weight of the…
user510
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Deriving the deflection force equation for a beam that is fixed on both ends

I want to calculate the force-displacement equation for a beam that is fixed at both ends. I think I should use the superposition principle but I am not very sure how to get started. I know that for, say, a beam with one fixed-end and applied load…
user5785
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Derivation of the equation of the work done in a polytropic process

I am completing a question that is requiring calculation of the work done in a polytropic process. In the worked solutions the work equation seems to be reversed for the answer, as can be seen in the screenshot- the top row is p1v1-p2v2 insted of…
Harrison De George
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Velocity of flue gases through a pipe

I was wondering if there is any equation that helps to calculate flue gas velocity through a pipe? Can I use the Poiseuille Equation to solve this problem by assuming the flue gas is acting as a newtonian fluid? The pipe diameter is 3.66m, change in…
user510
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Determining the microstructure of steel after welding in modern computer software

How can the microstructure of steel after welding be determined in modern computer software? I am aware that there are 'classic' methods of predicting microstructures like Schaeffler, DeLong or WRC constitutional diagrams. What I am wondering about…
bartosz.baczek
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Getting high RPM out of a low RPM motor

I'm trying to use a 1500 RPM-rated electric motor to accelerate a (light, 25kg) shaft up to 50 000 RPM. At these speeds I figure using a belt system or roller chains is out of the question due to wear and friction; are these kinds of speeds possible…
Thomas
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Does unloading beyond yield point also affect tensile strength?

I know that with strain-hardening you increase the yield and tensile strength. So if you unload at point D, then you also have cold worked it a bit right? So the stress-strain curve will look different after point D and have a higher tensile point?
strateeg32
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