sizing tubes ventures

[PierArg]

Yes, but it is irresponsible because you have to win only a few grams of precarious.
Have you ever seen a vn?

I've never seen her, I'll get a study, and then I'll let you know.
yes this, xò in theory the tube placed at the venturi exit having a diameter of 4mm, and being of rubber will cause friction that results in a loss of load, and makes the steam come back and prefer to pass for the reservoir (at least in part)....
When you return to the vn, you say that by putting it after the divergent system could work?(i.e., the steam does not return to the cleaner)

However, I have to put the rubber tube after the venturi tube... I will never come out of it

- load losses are "resistances", it is not that they return the fluid back. see them as obstacles.

- Why 4mm in diameter? the flow of steam that must pass what is it?

After your venturi, you can put all the pipe you want. there are other applications where after the venturi there are at least 5-6 meters of pipe (see washing machines).

Can you measure the pressure in the tube tract before the venturi?

 

[mambo1988]

- load losses are "resistances", it is not that they return the fluid back. see them as obstacles.

- Why 4mm in diameter? the flow of steam that must pass what is it?

After your venturi, you can put all the pipe you want. there are other applications where after the venturi there are at least 5-6 meters of pipe (see washing machines).

Can you measure the pressure in the tube tract before the venturi?

4mm is the tube that I have to connect after the venturi, made of rubber and it is as you said there that type of washing machines, but it is up to 2 meters.
the "static" pressure in boiler is 6-7 bar max,
during operation the "dynamic" pressure is 2-2.5 bar (manometer)
I calculated it with calculations 0,0004 (m^3/s)

 

[MBT]

I show you a fugitive example of venturi followed by a tube....
in this example (which exists in all cars and which you can buy for a few euros in any bricolage shop), the fluid is aspirated and ejected after a brush of almost one meter of rigid tube.. .

 

[PierArg]

I show you a fugitive example of venturi followed by a tube....
View attachment 28249in this example (which exists in all cars and which you can buy for a few euros in any bricolage shop), the fluid is aspirated and ejected after a brush of almost one meter of rigid tube.. .

What happened to you? I saw that you had a barbecue this weekend:biggrin:

returning to the venturi, I repeat that it is right that it also works with the tube.
the depression that is created in the venturi is the daughter of the variation of speed at the same point.
I'm sure that by applying bernol in the right sections, the final equation does not depend on the downstream pressure.

 

[MBT]

What happened to you? I saw that you had a barbecue this weekend:biggrin:

I was devoting myself to much more important things than the forum and the work:tongue:

returning to the venturi, I repeat that it is right that it also works with the tube.
the depression that is created in the venturi is the daughter of the variation of speed at the same point.
I'm sure that by applying bernol in the right sections, the final equation does not depend on the downstream pressure.

applications that use the venturi and that do not immediately discharge to ambient pressure is full of the world.
the limit can be given by the input pressure and losses around the circuit.

 

[PierArg]

I was devoting myself to much more important things than the forum and the work:tongue:

applications that use the venturi and that do not immediately discharge to ambient pressure is full of the world.
the limit can be given by the input pressure and losses around the circuit.

I am convinced that if you try again the system with the introduction of vn it works.

Obviously there is an extra load loss that reduces the amount of detergent compared to the one obtained previously.

 

[Enigma]

vi mustro un fuglido example of venturi followed by a tube....

:hahahah: :hahahah: "fuglido esempio" :hahahah: :hahahah: manca solo la locuzione "and in the periphery"enigma

 

[mambo1988]

I show you a fugitive example of venturi followed by a tube....
View attachment 28249in this example (which exists in all cars and which you can buy for a few euros in any bricolage shop), the fluid is aspirated and ejected after a brush of almost one meter of rigid tube.. .

hioo, the glittering example you did, I disassembled it in person because I have one in the garage(but I was not very useful as I couldn't disassemble it all)... also my system works if the tube, after the venturi, is a few centimeters, the problem is that I have a 1-2 meters long tube and it is rubber, of 4mm, if you blow with the mouth, you know that it makes trouble.

 

[mambo1988]

I installed the non-return valve, according to the scheme in figure the system unfortunately does not work, if there is the rubber tube.:frown:

 

[PierArg]

the position is right. the technical specifications of the valve: I don't want you to have "canned" in your choice (they are based on reach).
You should also have the load losses curve in fz of the flow.

 

[Enigma]

I agree ... another thing could be the "unlock pressure" of the non-return valve (which is not too high). . .

enigma

 

[mambo1988]

the position is right. the technical specifications of the valve: I don't want you to have "canned" in your choice (they are based on reach).
You should also have the load losses curve in fz of the flow.

I don't think it's due to the valve, I did several "experiments" and I noticed that when I put the rubber tube, it is forced to close because on them acts a remarkable force (I tried to blow directly (as if I were injecting detergent) and it makes a remarkable effort to open the valve, which without rubber tube, the system sucks without problems or the valve tends to open)

 

[PierArg]

... I tried to blow directly (as if I were injecting detergent) and it does a remarkable effort to open the valve, which without rubber tube, the system sucks without problems or the valve tends to open)

Of course you struggle to create the same condition of depression that would create the passage of steam!

put the type and valve builder.

I repeat, it is only a matter of defining the problem well. do you have a way to put a tube (that after the venturi) with a larger diameter?

 

[mambo1988]

Of course you struggle to create the same condition of depression that would create the passage of steam!

put the type and valve builder.

I repeat, it is only a matter of defining the problem well. do you have a way to put a tube (that after the venturi) with a larger diameter?

I found the unidirectional valve data sheet:
the company that produces it is waircom-mbs:

1/8" mounted valve characteristics are:
-port(nl/min)(p.a. 6 bar with (deltap =1 bar)) = 70
-pressure min (bar) = 0.2


Unfortunately the rubber tube is the standard 4 mm:frown:

 

[PierArg]

I found the unidirectional valve data sheet:
the company that produces it is waircom-mbs:

1/8" mounted valve characteristics are:
-port(nl/min)(p.a. 6 bar with (deltap =1 bar)) = 70
-pressure min (bar) = 0.2


Unfortunately the rubber tube is the standard 4 mm:frown:

I honestly didn't understand what you brought back. post the technical sheet.

but are you sure that in section 1 there are 6 bars? Isn't that maybe from the boiler to the warrant you have a gearbox?
and the speed of 7.5 m/s? How did you measure it? or did you deduct it from the flow?

 

[mambo1988]

the link where I took the technical characteristics of the vn is http://www.waircom-mbs.com/content_cat_100.html~@@@@@@cqsdvacuieqa@q@cuuataithe 6 bars, are written on the technical sheet and sincerely do not know what they refer to.
However, the speed I gave it from the flow, which in turn was obtained by knowing the thermal power, pressure and temperature of the steam. .

 

[PierArg]

the link where I took the technical characteristics of the vn is http://www.waircom-mbs.com/content_cat_100.html~@@@@@@cqsdvacuieqa@q@cuuataithe 6 bars, are written on the technical sheet and sincerely do not know what they refer to.
However, the speed I gave it from the flow, which in turn was obtained by knowing the thermal power, pressure and temperature of the steam. .

I think you're wrong with the input data! somehow measure the flow of steam and pressure!

your mass flow is 0.0012 kg/s and the speed of steam in an 8mm conduit comes out almost 6000 m/s

I remind you that the formula of mass flow is:
*

I think you used the formula of normal flow by inserting the value of mass flow.

p.s: I'm making calculations but I doubt I'm coming to a plausible solution. input data is wrong.

p.s2: you have to know the dosage of the detergent (e.g. 5%, 7%, etc.). Tell me the density.

 

[PierArg]

the link where I took the technical characteristics of the vn is http://www.waircom-mbs.com/content_cat_100.html~@@@@@@cqsdvacuieqa@q@cuuataithe 6 bars, are written on the technical sheet and sincerely do not know what they refer to.
However, the speed I gave it from the flow, which in turn was obtained by knowing the thermal power, pressure and temperature of the steam. .

on the board does not report the load losses... and then you should have taken it hydraulic (the cleaner is liquid...right?) not those tires.

 

[mambo1988]

I think you're wrong with the input data! somehow measure the flow of steam and pressure!

your mass flow is 0.0012 kg/s and the speed of steam in an 8mm conduit comes out almost 6000 m/s

I remind you that the formula of mass flow is:
*

I think you used the formula of normal flow by inserting the value of mass flow.

p.s: I'm making calculations but I doubt I'm coming to a plausible solution. input data is wrong.

p.s2: you have to know the dosage of the detergent (e.g. 5%, 7%, etc.). Tell me the density.

the values that come out to me are:
speed = 270 m/s approx.

I started from the qm=0,0012 kg/s knowing the rho= 3,13 kg/m^3 I find qv=0,003 m^3/s so I have v1=8 m/s about.... .
I said this I imposed bernuolli and convervation of the mass...
I arrive at the result by imposing pressure in the throat section of 0.8 bar(in my calculations I considered the venturi output at a pressure of 1 atm) a speed of about 270 m/s

I don't care about the dosage anymore, the important thing is that the venturi tube can suck, then with a faucet it all hurts!

 

[mambo1988]

si the detergent is liquid, it has a density about-equal to that of water therefore 1kg/dm^3