Recent content by lba

With this shape I don't know how torques could be cancel themselves ? Repartition are not the same and radius change in the same time. A = Gas A of density 1 B = Gas B of density 2

Maybe animations are not clear, I would like to see if it's possible to rotate green wall without have red wall (message #7) with this method. Temperature of gas A and B is constant, for example at 290°K regulated from external. Volume of gas A and B is constant like simulations show. So...

You're right, so with the animations, nothing turn except gas A, gas B and green wall (circles don't turn, no reason for that). This seems a possible mechanical movement, So like green wall recover torque while it rotate, something must be wrong in this movement ? I drawn black volume move...

imagine the gas is turning in front of you (like in a wheel of bicycle for example), you move in a black volume. The gas turn and you not. Mechanically the wall must be dynamic, but it's only for compared theory energy when: 1/ gas turn, black volume turn 2/ gas turn, black volume don't turn...

No it's not really temperature, temperature is the kinetics energy of gas. But when gas is in rotation it has more kinetics energy. An object that turn with gas see only kinetics energy from gas. When the object don't turn like gas, is it more difficult to enter the object compared with the...

1/ Ok. The result change if black volume don't turn like gas, the black volume don't "see" more temperature ? 2/ I have another question about torque with 2 different density of gas. I'm interesting about green wall only (not red). If Y>X (see drawing) the gas B will be more at external...

I don't understand how shape modify the result, could you explain ?

Yes take a part of circular sector This even W is very high ? Could you explain a little more ? H can be greater if it's a part of circular sector ?

I would like to calculate the energy need for move in the black volume in gas (move in from r2 to r1), when gas is under rotating movement. The black volume turn at the same speed than gas. The weight of black volume is considered like 0. Like rotating create centripetal force, the pressure at...

Why energy is PV ? because at top if I want to return ball (without change its temperature) I need P*V energy. Where the pressure falls ? At top the ball is in 0 pressure (vacuum) Temperature changing/constant ? For me the internal temperature of ball don't change during move up. The external...

I'm trying to understand where energy is lost. First, with a system with water+gravity+vacuum+pressure (a barometer), the sum of energy is 0, we agree with that. Now, take the hypothesis we can recover energy from temperature without lost energy. With a barometer when you put a ball with air...

I put a drawing for show an example. Sure the system would be complex but it's only a technological problem.

I'm agree with that, the sum of energy is 0. But I would like to know with a macroscopic scale system. Imagine the system with balls, velocity, springs, ..., like that it's possible to recover energy from velocity. And if balls are empty, they disappear at top, let only walls and walls can be...

thanks for your reply :) but it's like a barometer not a simple column of water, no need energy to enter in water because outside pressure = 1 bar.

The drawing show a barometer with water inside. If I move up object with air inside I recover PV energy (P=external pressure, V=volume of object). If I want to move out object when it is at top, I need PV, is that ? So if it's that. If I replace: 1/ gravity by balls attracted with springs (for...