Recent content by magicfrog

This only means one thing, considering thermal effects negligible implies considering a fluid non-viscous. Correct?

I don't want to ruin the party but, shouldn't viscosity also enter into the first law of NS? Turning to the energy equation I would be of the opinion to neglect the variation of heat as well as all variations of potential energy. I have doubts about work.

Let's play with these equations and see what we come up with. Somehow we will come out of it!

Thanks for the explanation! I don't want to say something stupid, but aren't there edge conditions required to apply this relationship? From what I remember it refers to the generic formula of the lift or resistance of a body .I seemed to remember that there were unperturbed flow or boundary...

Excuse my ignorance but what do you mean by ‘tinker model’? Drag force? Can you explain better what you mean? Thank you very much!

The only thing I can say for sure is the conservation of mass as an incompressible fluid. Knowing the velocity that insists on the section of diameter d1 I can derive the velocity in the various sections. But how can I relate this result to pressure drops? Should I go back to the Navier-Stokes...

The piston speed is known and therefore also the fluid velocity. I'm asking for pressure drop when the fluid has a certain velocity in the two stations (first orifice and meatus between seat and sphere) knowing however that the fluid is incompressible but viscous.

Hi everyone, I hope this is the right section to post this problem I'm getting lost in. In theory it seems trivial but in the end the reasoning doesn't make sense to me. I refer to a real case study, a check valve (made internally with a spring ball system) in a piston that moves inside a...

Then I would say that this is not the case since the follower diameter is slightly smaller than the master cam diameter. And certainly those small radii do not help to have a ‘continuous’ curve. What if instead you wanted to draw the cam profile curve known as the torque curve with respect to...

Would this be true even if the two curves have a tangency constraint? Or does it depend on the curvature alone?

I share my steps and also the curves obtained with excel through this process. In particular, based on the angle from 0° to 90°, I divided the spline into three curves described by circumferences (known centres and radii) that I considered interesting for the study. I have obteined from...

Yes I understood the concept, which is why I wanted to emphasise that I consider it negligible in the first approximation. It must also be said that the next step is to take it into account when calculating the torque acting on the cam. This does not only include the force normal to the...

Thank you for your suggestion. But in this approximation we can consider it negligible for the purpose of calculating the acting force and torque, correct? Especially in the case of considering components acting on each other with pure rolling.

I will add an answer. I followed the advice you gave me. In doing so, I had an epiphany which I post here with the following image. Using trigonometry, I was able to write the distance x(ϑ). The variation of x(ϑ) respect to x(ϑ=0) is the variation in stroke of the spring pushing my follower...

I thought about what you suggested, but I still have a doubt. By keeping the cam fixed and rotating the follower around, I have an angular and a radial variation of the centre of the follower. I can't see how I can manage the radial (orange) variation as the angle changes. Conversely, if I...