calculation section slot

[MassiVonWeizen]

I don't insist, but it's less messed up than it looks.
the section should be calculated with a perpendicular view to the direction of the hole (point) and in the specific case a kind of ellipse is formed.
a simple dxf or dwg

That's what I said about myself. the gift of synthesis rhymes me against definitely

 

[Vittorio]

That's what I said about myself. the gift of synthesis rhymes me against definitely

in fact I have supported your solution.
I add. . .
If a pipe cut it into a slice of salami. . its scope would remain equal

 

[Cadinpiedi]

should publish News

Yes, I would. News

 

[Fabietto]

ciao News, and so the correct section is?

 

[Alarast00]

Hello, guys, excuse the blackout but I had some health problems these days and I didn't approach the pc.

I continue to be a little skeptical about the fact that the area calculated on a projection on a normal plane to the axis of the hole can represent the correct area, the fact that the opening has a "depth" makes me think that it is more correct to consider the ball clove, but I am not sure of it.

I allege the step of the case indicted, unfortunately I haven't gotten to work on it any longer these days.

Thank you.

 

[Vittorio]

the fact that the opening has a "depth" makes me think that it is more correct to consider the ball snitch,

the depth has nothing to do with
for me the area is 0.398mm2

 

[Alarast00]

the depth has nothing to do with
for me the area is 0.398mm2

to me with the ball pin turns out 0,42mm^2. How did you calculate it?

 

[Vittorio]

to me with the ball pin turns out 0,42mm^2. How did you calculate it?

I calculated it with the projection according to the direction of the tip.
for me it is the actual area for the passage of the fluid.
If you have a tube and cut it into a slice of salami.. Your flow section remains the same right?
in your case.. the section is an ellipse and the passage area is as I calculated it.
I am ready to be denied though.

 

[Vittorio]

ps:
parts with the smaller section, try and enlarge you are always in time

 

[Alarast00]

ps:
parts with the smaller section, try and enlarge you are always in time

Yes, in fact the accuracy of the 3d measure is not so fundamental because however there are half of the localized and distributed load losses that obligate to make empirical tests. it was in a way also a geometric curiosity to understand what is correct to do.

probably, as you say, this case is comparable to the pipe cut into slice of salami. :

 

[Cadinpiedi]

I confirm the two measurements:
0.39780320279080739
0.422935523876961
I also propose for the first hypothesis. I think that the flow load losses depend on the shape of the section definitely different between a flat lenticular section and a ball portion.

 

[Fabietto]

Hello, everyone.
I also detect the measures you have taken in 2 cases. However, I am not yet clear which of the 2 measurements is correct, or mirror or projection.
so by curiosity I did, and I attach, an additional hole where the opening that is generated is not orthogonal to the hole axis.
the results are:
mirror = 0.1788 mm2
projection = 0.097 mm2
It is true that we are talking about very small values, but in this case the difference between measurement methods is almost double. .
in my view the correct measure is that of the eye, and according to you?

Hi.

 

[Vittorio]

ciao @faceI confirm my theory.
the area, according to the direction of the hole, is = 0.398mm2
and this represented could be the jet of the fluid.
in my opinion the direction of the fluid is conditioned by the hole.

 

[Fabietto]

ciao @faceI confirm my theory.
the area, according to the direction of the hole, is = 0.398mm2
and this represented could be the jet of the fluid.
It can only take this direction the fluid.
View attachment 69255

Hello victorious.
Did you manage to upload the file I attached and try to calculate the area on the new hole I added? so we can compare on a non-orthogonal slot to the hole. .

 

[Vittorio]

Hello victorious.
Did you manage to upload the file I attached and try to calculate the area on the new hole I added? so we can compare on a non-orthogonal slot to the hole. .

si @face , I loaded it
and if you change the direction ... change the section (also on the original hole)
But for me .. the calculation should be done according to the direction of the hole.
the ball clove should not be considered.. the jet is that and does not consider (for me) the ball spike
to make an example... if I had to drill a ball with a tip of 2 mm.. the passage of the liquid would be the area of the hole ø2

 

[Fabietto]

ok, @vittori Got it.
So the area measured with your system, on the slot added by me, how much do you get?

 

[Vittorio]

ok, @vittori Got it.
So the area measured with your system, on the slot added by me, how much do you get?

according to the direction of the hole.. confirm your measurement of 0.098mm2

 

[Fabietto]

Okay, but taking back your post#33,
even in this case the jet of the fluid coming out will be in axis with the hole?
I think not, the jet will have a direction of about 45/60° regarding the axis of the hole, which is why the passage area should be calculated on an orthogonal plane to the slot, and not orthogonal to the hole axis.

That's my reasoning I did.

 

[Vittorio]

bho... @face doubts remain.
I think of the toothpaste tube.
If we had to squeeze it with that cut... How would you behave? and what direction would it take?
Even if you don't convince me, your reasoning can be right.
for now we keep the reserve of doubt and the next tube of toothpaste.. I will try to simulate a similar cut :roflmao: ,
Anyway, does it seem to me that we agree that the ball's not about it?

 

[Vittorio]

wave! @faceThanks to the toothpaste, I thought about it.
I think your theory is right. the direction of the exit of the toothpaste would be according to the normal of the cut and therefore the section should be calculated according to that direction.
I sleep tonight