Recent content by PHstud

It is a mixture indeed, is it possible to calculate knowing the concentration of the different components ? And Baluncore, Thank you for the link, but I can not find any informations about the latent heat ?

Hello everyone ! I am currently looking for a way to find the heat of vaporization of Acrylonitrile butadiene styrene I can not find any papers or source about it, so maybe I thought there is some chemistery table that could help ? Do you have any ideas/sources ? Thank you !

I hear what you say, but in that case, a flat plate perpendicular to the flow(100% pressure drag) doesn't really have a behaviour with a boundary layer like you describe it, does it?

Thank you for all your answers. I do understand that drag will come from viscosity and finite wing (if you are talking about induced drag, right ?). I got an answer for half of my question, indeed, it is easy to see why a sphere does not have drag in a inviscid flow (because of the total...

Hello everyone. I have a question about the fact that there is no drag in the thin airfoil theory. I have read that it comes from inviscid and incompressible flow (potential flow) but what i can not understand is why there would be no drag from pressure differences ? The skin drag is of course...

But if we consider each serie individually, don't we lose the 'stochastic' behaviour of the process ?

I do mean autocorellation. These 3 curves belong to a stochastic signal, and each realisation has a probability to happen and result in one of those trajectories

Hello ! I am trying an exercice to get a better grip of what is the autocorellation meaning. I know the mathematical formula, but let's consider a case. If in the case above, the probabilty of the red curve to happen (so w2) is Pr, the blue one Pb and the green on Pg, what would be the...

Hello ! I have troube doing a calculation. Let's say we have a volume Vi in a tank at a pressure Pi. If I let my tank open, the tank's liquid will start to boil to keep the pressure Pi inside the tank. Now, at the end, I will have a volume Vf in the tank, and still a pressure Pi. But the...

Hello ! I am having a bit of trouble understanding something about exergy. On one hand, I read that (1-Ta/Tc)*Q (exergy heat) is the maximum work given a heat transfer and a reservoir's temperature. But from the other hand, I read that this exact same (1-Ta/Tc)*Q represents losses. ( Which i...

Maybe I miswrote it, let's consider that dH=TdS+vdP then

Hi ! I'm having a bit of trouble understanding something. Let 'u' be internal energy, 'h' enthalpy, 'e' work and 'q' heat. ('r' are dissipations and 'S' entropy) From a book , i read that de+dr=PdV= -du + TdS This seems to stand for closed cycle. Yet, my teacher uses the formula de+dr=vdP=...