PHYS 146 Fluid Dynamics, part 1: Fluid Flow

Video lecture for PHYS 146 at the University of Alberta. For the iBook on the course go to:
or for a hard copy:

Flow is a defining characteristic of a fluid. This lecture introduces the concept of surface tension and then covers the types of fluid flow using examples both in nature and the lab. To conclude the continuity equation is introduced and used to characterize the flow of incompressible liquid in a pipe.

[missghani]

its lovely to understand the concept behind all those boring equations, Thank You!

[MontyPython]

So if I understand correctly, halving the cross sectional area within a pipe (with a fluid flowing with enough pressure to push it through, assuming the pressure remains constant) doubles the velocity, while flow rate (volume (or should I say, "mass") of fluid moving past a point per unit of time, yes?)) stays the same. If I'm understanding correctly, that is exactly what I surmised would be the case.

Edit: Ah, I see now that there are two types of flow rates, volume flow rate, and mass flow rate (which if I'm not mistaken because of the included Density variable the equation we're actually dealing with here is for _mass_ flow rate, without which would simply be volume flow rate), so that if you have an equivalent mass flow rate at A(2) where the density of the fluid at that point was somehow doubled, velocity would have to stay the same, while actual volume flow rate would actually be half. In other words, given that normally (without any compression which would necessarily increase density) the velocity would be doubled if the cross sectional area were halved, if the velocity actually stayed the same, this would mean that the _mass_ (or actual _amount_ of water) flow rate would be the same, while the _volume_ flow rate would be halved, *if the **_density_** of the fluid at that point were doubled.* Please correct me if I'm wrong on any of this.

[Matchless_gift]

Natural examples make the vedeo more interesting...great introduction to FD

[a.msayem]

love and respect, thanks for sharing your valuable knowledge

[mdmumtazalam]

Thanks u sir for such a
excellent lacture

[jeil]

Awesome! Do you have any video explaining the Saint venant equation?

[varunkumara]

This is a very good video. Thanks a lot.. :-)

[MrTatica]

One little mistake:
Mass=density x volume
Volume=Area x length
Length=velocity x time

Well, professor has forgotten to mention the time in the equation. Although it will be cancelled out but it has to be mentioned. Otherwise, one could think that length=velocity as per the picture shown

[nope]

(i followed this too. my guess- genderFLUID.(like mee) just a guess tho.)