# Search results

1. ### Pressure loss pipe system: Conversion from known fluid1 to fluid2

What are the densities and viscosities of the two fluids? Are you comparing them on the basis of the same mass flow rate or the same volume flow rate?
2. ### Irreversible quasi-static processes?

None of this makes any sense to me, and most of it is wrong. Also, please do not use differentials for irreversible processes.
3. ### Pressure loss pipe system: Conversion from known fluid1 to fluid2

If the flow truly is laminar, and there are no changes in elevation (so the density doesn't matter, assuming constant volume flow rate), the pressure drop is going to be proportional to the viscosity. But, aside from polymer melts and solutions, I highly doubt that the flow will be laminar. If...
4. ### Pressure loss pipe system: Conversion from known fluid1 to fluid2

This is not quite correct, because the friction factor is going to depend on the Reynolds number, which is inversely proportional to the fluid viscosity.
5. ### Irreversible quasi-static processes?

If the expansion is reversible (quasi-static), you can use the ideal gas law to get the pressure of the gas at the piston face where the work is being done (and it is equal to the external pressure of the piston face on the gas). If the expansion is irreversible, an ideal gas does not satisfy...

30. ### A Crank-Nicholson solution to the cylindrical heat equation

If you didn't make any mistakes, it would work. Try a calculation in which you use only 21 grid points and choose delta t such that it makes alpha close to 1.