Recent content by Termotanque

We are using Sandler's Chemical, Biochemical, and Engineering Thermodynamics, and Smith & van Ness for our third year thermodyamics course. What is a good book to study power, heat and refrigeration cycles? Sandler's has a chapter dedicated to that, but it's not enough.

Asynchronous generators are rarely used because their speed has to be almost twice the synchronous speed for maximum efficiency, and they have to be magnetized externally to be able to start. However, it's possible that they found some use for them since they are cheaper and could in principle...

Wind turbines typically use synchronous generators, which output variable frequency because the wind speed is variable. The output is then rectified to DC and connected to a line common to all the other wind turbines. Then the DC current is converted to AC at constant frequency with an inverter.

I'm very interested in building this cool device, and was wondering if water could be used instead of air as the injected fluid. The main differences I notice are the much larger density, and thus possibly smaller angular velocity. And higher viscosity, which could mean a smaller radial...

Can what you just said be proved from the laws of thermodynamics, without looking up ΔG values on tables?

If we add a small amount of heat δq to a liquid at its boiling point Tb, it could either increase its temperature a small amount dT = δq/Cv, or suffer a phase change into vapor. Experimentally, we see that liquids remain at Tb until the phase change is complete, and only then continue...

I'm not sure if I understand what you are saying. Could you provide some example? I don't find it intuitive since I've never worked with double sums that way. I was trying to use cauchy's product, but was unable to find a general expression for c_n.

Homework Statement Find the Laurent series of f(z) = exp(1/z)/(z-1) around 0, and find Res{f(z), 0}.Homework Equations The Attempt at a Solution To find the Laurent series, I wrote exp(1/z) = \sum_{n=0}^∞ z-n/n!, and 1/(z-1) = -\sum_{n=0}^∞ zn. Then, using Cauchy's product, and rearranging...

In general, complex impedance.

Why do you want your plates to be infinitely far apart?

Is it connected in series? If so, according to Kirchhoff, V(t) = i(t)R + (1/C) int_0^t i(u)du + L di(t)/dt Solve that equation and you are done.

Why are you saying that it's constant V_0? The cylinder is not closed as far as I understand. It's like a toilet paper roll. If it were closed with lids, I'd see why, but in this case how would you explain? The boundary conditions are V_0 on the roll, and V_1 in one side, and V_2 in the other...

The problem is as follows: Two long coaxial cylindrical metal tubes (inner radius a, outer radius b) stand vertically in a tank of dielectric oil (susceptibility χe, density ρ). The inner one is maintained a potential V, and the outer one is grounded. To what height (h) does the oil rise in the...

Is there any symmetry? Use Gauss law to calculate the electric field.

If the magnets are not close, the magnetic field is far from uniform and you'll have a rough time calculating the force. One thing that you can do is to suppose that they are far apart, and calculate the magnetic force on one magnet (thought as a dipole), due to the magnetic field of the other...