Recent content by Aj83

Technician you are right, I noticed that too but didnt correct it. I think the equation DrClaude wrote is when Boyle's and Charle's Laws are combined to derive ideal gas equation.

Thanks for your replies, I understand why the temperature increases when the work is done on the gas (in adiabatic compression work input goes on to increase the internal energy hence the increase in temperature). I was just trying to understand it from the Boyle's law point of view and it's...

So does that mean that ideal gas equation which is based on boyle's law is not applicable unless the expansion or compression is isothermal?

As the Boyle's law states that there is an inverse relationship between pressure and volume at constant temperature, so why does the temperature increases in practice when for example air is compressed i,e increase in pressure and decrease in volume?

As far as CAD tools are concerned UGS NX and Catia V5 are most widely used in aerospace industry (Rolls Royce, Assystem, UTC). Matlab is widely used as a data manipulation tool and Simulink which is a toobox within Matlab is used for control and systems engineering.

Turbojet engine has no fan so all the thrust is produced by the engine's core (compressor, combustor and turbine) hence they are a lot less efficient than turbofan engine but only at sub sonic speeds. At supersonic speeds the large frontal area of turbofan engine becomes major contributor to the...

Better in what sense? If the impact force is same in both cases then they both have same momentum, in which case it's useless to do pre-impact calculations. But just to add some facts to the pre-impact events, pointed pellet will experience less aerodynamics drag so effective velocity will...

jbriggs, I appreciate your responses but this doesn't answer the question I asked in this thread. For simplicity, let's assume flow is 1 dimensional (horizontal), pipe's surface is very smooth, length is very short so the viscous losses are very small. In your regulator example, what does...

1. Water Hammer. This effect will occur only momentarily as soon as let's say the thumb is placed on the end but once the fluid settles to that change it will disappear i,e no surge or hydraulic shock. However velocity increase is not momentary, it remains increased (try doing that to your...

So say tap is open to some specific flow rate, if you put a nozzle (a converging shape) at its end why does the velocity increase? or why does velocity increase if you put your finger such that its blocking the exit partially?

Thanks for your reply. I understand the Bernoulli's principle which says with increase in flow velocity,the static pressure decreases and vice versa. So in this case as the restriction increases the static pressure drops further across it which will lead to an increase in flow velocity(increase...

Right, Let me put it in another way. If you put your finger in front of a pipe outlet, let's say while watering your garden, so that you are blocking the outlet partially. When you do that, will there be a reduction in flow rate or will the velocity increase to keep the flow rate same? I am...

Anyone?

I think the velocity will decrease and flow rate will remain same due to continuity?

For a fixed pressure differential will the flow rate remain constant or will it increase as the restriction decreases. So imagine certain volumetric flow rate through partially opened valve, will the flow rate increase or will it remain constant as the valves is opened further? Assume density...