Recent content by T C

Then, as per my described scenario, the flow can accelerate above the initial value or not. If it can exceed the that in case of natural winds, why not for a flow created by a fan!

The main point is whether the speeding up can exceed the initial velocity or not. At least, it seems that you and me agreed on one point that in the fastest areas, the velocity exceeds the initial velocity. But many participants here are saying that such things can't happen.

If wind can speed up over the hills, it will certainly speed up over tall multi-storeyed buildings or similar kind of structures.

The acceleration of the flow above its initial velocity while trying to overcome the barrier. Overall output means increase in output due to this I.e. above the level in comparison to any conventional wind turbine of similar size placed in open air instead of the edge of the building roof.

There is no question of denying the Betz limit. Point is whether this acceleration can increase the overall output or not.

My point is simple, the increased velocity comes at the cost of enthalpy. And for compressible fluids, pressure and internal energy is very closely tied and fall/rise in one means fall/rise in the other too if it's an isenthalpic process i.e. no energy can enter or leave the system.

Other things means factors like humidity etc. In Bernoulli's equation, it has been considered that the there would be no change in volume despite the fall in pressure. But in reality, there should be fall in volume and temperature as gas laws suggest. As for example, we can consider the g to be...

At the end of the day, it's enthalpy.

Decreased pressure means fall in temperature and that means energy is released. That energy is being converted into the kinetic energy.

The equation simply says that as the velocity increases, the pressure decreases. And the decrease in pressure is proportional to the square of the increase in velocity (the gz part can be neglected).

Plain and simple explanation, the compression-expansion and related fall in temperature is small in comparison to the overall temperature and therefore it can be neglected and we can consider it to be "practically" incompressible. The condensation over aircraft wings is a reality and can't be...

In short, a part of enthalpy has been converted into this extra velocity. There is no other explanation.

Whatsoever, it's a proof that temperature fall occurs due to the increase in velocity. I am just curious to know that happened to the energy that has been released due to this phenomenon.

Condensation above aircraft wings are a very common phenomenon for a long time i.e. from subsonic to supersonic. Condensation occurs means there is fall in temperature otherwise it's simply not possible.

That means the fall in temperature following the fall the pressure and the energy released in this way is being converted into kinetic energy, right?