Register to reply

Vortex tube design

by machinest
Tags: design, tube, vortex
Share this thread:
machinest
#1
Sep5-06, 03:01 PM
P: 45
have anybody heared about the vortex tube?its an air cooler tube without any moving parts,and there is a link where u can get a little info about it
http://www.visi.com/~darus/hilsch/
my ques:
1-could the nozzle be straigh?(const cross section?
2-which materila i should use to design this tube?and the whole parts should be made from the same material?
anybody had info about this?-please let me know-
thanks in advance
Phys.Org News Partner Science news on Phys.org
Apple to unveil 'iWatch' on September 9
NASA deep-space rocket, SLS, to launch in 2018
Study examines 13,000-year-old nanodiamonds from multiple locations across three continents
Q_Goest
#2
Sep5-06, 03:17 PM
Sci Advisor
HW Helper
PF Gold
Q_Goest's Avatar
P: 2,906
Vortex tubes are made by various companies here in the US. Thomas Register lists 17 manufacturers:
http://www.thomasnet.com/nsearch.htm...sec=prodsearch

1-could the nozzle be straigh?(const cross section?
What nozzle are you referring to? There's some geometry inside which creates a spin to the air. That has to be perpendicular to the hot/cold tubes since it must create this spinning affect inside the tube.

2-which materila i should use to design this tube?and the whole parts should be made from the same material?
Any material which is strong enough for the pressure involved is acceptable. You could get fairly cold air coming out so you must take that into consideration if using plastic. You could also make different parts from different materials, it doesn't matter.
Danger
#3
Sep5-06, 07:18 PM
PF Gold
Danger's Avatar
P: 8,964
I've never heard of these things before, and don't have time to investigate right now, but it sounds pretty neat. My only comment upon the issue of materials is that in areas of serious temperature changes or differentials, the fitted parts pretty much have to have similar thermal expansion characteristics. I don't know whether or not that applies here, because I have no idea how they work.

machinest
#4
Sep6-06, 12:26 PM
P: 45
Vortex tube design

thank u both for ur care to help.
the nozzle in which u have to supply the air to get air jet to ensure to generate a strong vortex,when i looked in these graphs i didnt find a nozzle,they were talking about in their explanation in this link i left up,the nozzle have a variable cross section,this one its cross section is constant,i ask about could it be?could it generate the jet?.
and the material,shouldnt i choose one which wouldnt make a noise?
danger the vortex tube im talking about in the link if u have time to look.
thanks in advance
Q_Goest
#5
Sep6-06, 12:47 PM
Sci Advisor
HW Helper
PF Gold
Q_Goest's Avatar
P: 2,906
The jet you're referring to is intended to increase the velocity of the gas in order to generate the vortex within the tube. It can be a very short, straight passage which comes off your supply piping, but it would be better if the inlet to the passage were well rounded to better convert pressure to kinetic energy.

Regarding noise, you won't hear much noise. Material considerations shouldn't take noise into account.
machinest
#6
Sep6-06, 02:07 PM
P: 45
thank u Q_Goest
yes its short straight passage,but they called it an inlet nozzle.
u mean with rounded(variable cross section?)convergent or digergant nozzle u mean?to convert the pressure into kinetic energy?if yes,which one i should use?convergant?or divergant nozzle?
its depending on the flow inside i know if subsonic or supersonic,in my opinion i think i would choose a convergant nozzle.
they attached a muffler to the hot tube to reduce the noise,in fact i never heared about the muffler,how can i do or get it?
thanks again
Q_Goest
#7
Sep6-06, 02:16 PM
Sci Advisor
HW Helper
PF Gold
Q_Goest's Avatar
P: 2,906
You should only need a convergent nozzle. The divergent half of the nozzle won't help since as soon as the air gets into the swirling chamber, it will go subsonic, creating a shock at the nozzle exit.

Regarding a muffler, you can get them from McMaster Carr (just type in "muffler") for about $10, or you can make your own using fiberglass batting and punching some holes in your pipe.
machinest
#8
Sep6-06, 07:17 PM
P: 45
thank u dear,
im going to do it,what about aluminuim?as a material?its available for me,also easy to be machined,or PVC would better?--and one more question please-should i insulate the tube?or not?whats the difference?and which material should i use as insualtion?
Danger
#9
Sep6-06, 11:01 PM
PF Gold
Danger's Avatar
P: 8,964
Quote Quote by machinest
danger the vortex tube im talking about in the link if u have time to look.
The link wasn't accessible the first time around. At a quick glance now, it appears to be very interesting. Unfortunately, I've had a lot of beers and the wife is agitating for me to get off of the computer. The one computer at work that was hooked up to the net is in the shop, so I'll try to take a look before work tomorrow, or will definitely check it out when I get home after.
Q_Goest
#10
Sep7-06, 06:24 AM
Sci Advisor
HW Helper
PF Gold
Q_Goest's Avatar
P: 2,906
Aluminum is fine. I wouldn't recommend PVC unless you know how to calculate stress and affects of temperature.

I've not seen any vortex tubes insulated, because they are generally very short. Unless you need to pipe the cold air some distance, I wouldn't worry about the insulation.
Danger
#11
Sep7-06, 08:34 AM
PF Gold
Danger's Avatar
P: 8,964
Okay, Machinest, I've had a chance to look it over. What a neat little gadget! Thanks for bringing it to my attention. I would agree that aluminum is a good choice of material. I know from personal experience that high-speed air can be very loud, but I don't know that one of these things would need muffling. Since Q obviously has more knowledge in the subject, I assume that he's correct about this not making much noise.
rocky2
#12
Sep16-06, 08:58 PM
P: 2
there is a forum on www.smartgroups.com about vortex tubes ....join there and get help from many guys there......i was a member ...i will give one mail id if u want...he knows a lot about this thing
machinest
#13
Sep21-06, 10:06 AM
P: 45
ok-rocky-thank u -
ive registered that forum,but i couldnt get into mechanical engineering group there,anyway-give me the mail id of ur friend and im gonna contact him
thanks again
jprabu
#14
Sep26-06, 03:53 AM
P: 3
how to design the vortex chamber of vortex tube.?
what is the cross section of vortex chamber?
jprabakaran
jprabu
#15
Sep26-06, 03:55 AM
P: 3
how to design the vortex chamber of vortex tube?
kleinjahr
#16
Sep27-06, 10:02 AM
P: 75
Vortex tube has been around for quite sometime, apparently saw most use during WWII in Germany. It's not particularly efficient but does work.
You do require a regulating valve on the hot end, a needle valve works quite well.
"Modern Refrigeration and Air Conditioning" has some good info on them.
Shridhar .S
#17
May4-07, 06:10 AM
P: 6
can some one who has got a vortex tube open the parts and make a drawing and a mail it to caddpro@hotmail.com
Shridhar .S
#18
May4-07, 06:30 AM
P: 6
can some one who has got a vortex tube open the parts and make a drawing and a mail it to caddpro@hotmail.com


Register to reply

Related Discussions
Long tube headers vs. short tube headers. Mechanical Engineering 8
Vortex tube application question Mechanical Engineering 9
Fixed-Tube-Sheet Shell and tube Heat Exchanger Materials & Chemical Engineering 1
The Vortex doubt Mechanical Engineering 1