De Laval Nozzle

Contest Ended, Winner(s) have been selected.
A De Laval nozzle for supersonic kinetic spraying.
Nozzle dimensions (mm):

- Inner diameter: 10
- Throat diameter: 6
- Exit diameter: 8.8
- Length of the converging section: 40
- Length of the diverging section: 100

The above dimensions must be exact. However the size and shape of the nozzle externally is left up to you, considering the following:

350°C air enters the nozzle at 6 bar. It is connected to the air compressors 1/2" male adapter. Therefore a 1/2" female thread will be needed to connect the parts together.

Suspension liquid enters the gas flow in the supersonic part of the nozzle and is atomized by the gas cross-flow. The tube connected to nozzle which supplies the suspension has a 1/4" male adapter, so a 1/4" female thread will be needed.

The design does not need to include the female threads as they will be added after the CNC process (another version of the design showing these [threads] would be favorable). Just know that the space and position of these threads will need to be factored into your design.

Thank you very much.

P.S. The software used for the CNC process is unknown at the moment, so if at all possible, please include a few of the most popular file types.
  1. AutoCAD


1st Winner
#3 De Laval nozzle by Jezdo
I hope you like it.
Please, give some feedback, and tell me if there is anything you want to modify.
2015-09-05 19:54:06
#1 De Level Nozzle 1 by Irfan
2015-09-05 07:21:27
#2 Simple Machining Nozzle by Jorge Parada
This is he simplest Mahining for the nozzle. Justa added an Hex handle in the body to fix to the assembly
2015-09-05 15:04:17


Tue, 08 Sep 2015 10:16:37 +0000
what is your problem bad buyer? we work on designs and you chose one before given us time?!?!?!?!?!?!??!
Mon, 07 Sep 2015 15:53:38 +0000
Maybe next time, you'll give us all a chance to upload something Ribbotech ;) I didn't had time today, but tomorrow I would have uploaded something...your loss :P
Mon, 07 Sep 2015 04:24:55 +0000
hi ribbotech, i personally don't have any issues about the premature ending. i think if you get what u want in just 2-3 day then why to wait for a whole month. its completely OK but i feel after seeing your end submission date many designers might have postponed there designing to some later time (as i did) knowing they had a whole month to model your project. anyway, again saying i am totally ok with this in fact eagerly waiting for your future projects to be posted here.
thanks and regards.
pardon me if you find any grammatical error in what i wrote!



Sun, 06 Sep 2015 17:05:17 +0000
You are right, I ended prematurely! I nooby mistake that I will not make again. I didn't realize the attention this would get and that people were working on the project without me knowing.
Sun, 06 Sep 2015 16:33:04 +0000
ended!! but the contest end date is 6th of October and this is September, if i am not wrong ;)



Sat, 05 Sep 2015 20:09:44 +0000

What a fantastic first experience with this site.

I am so grateful to all of you who helped, you won't be forgotten ...Many more projects to come!

Thank you



Sat, 05 Sep 2015 16:03:41 +0000
The functional parameters have already been considered. If the nozzle dimensions are followed precisely, everything should work as planned.
I would also like to note 2 things after reviewing the current designs submitted.

1) The 2 threads connecting the nozzle to the other parts of our device can be male or female threads at any standard size, as we can use couplers/adapters to fit them together here. I don't want this to inhibit your designs.

2) The inlet that receives the suspension needs to have a 3mm inner diameter when it enters the chamber.
Sat, 05 Sep 2015 15:46:49 +0000
Hello Ribbotech,

Are you interested only in visual improvements or also functional?
If you aim the functionality (parameters) then is a little more complicated as the aerodynamics in such devices is very complicated and there are several effects involved (Venturri, Coanda, particle dispersion, etc) and this is possible to achieve only with a CFD analysis.
If your interest is only for external design, there is no problem and the file will be neutral CAD (iges, sat, step).



Sat, 05 Sep 2015 11:43:46 +0000
Visually, the nozzle looks better than I could have imagined.

Solidworks will be fine.

It seems like the suspension enters the nozzle before the air goes supersonic (after the throat, in the diverging section).

The air needs to enter directly from the rear (in the convergent section) and there needs to be room to add a female thread adapter without compromising the air inlet.

Adding the flow straightener is a nice idea. Could you include a version with and without this?

At a glance, the sizes look disproportionate, but that could just be me. Please make sure that the dimensions in the spec are 100% perfect.

Thank you for your great work.
Sat, 05 Sep 2015 01:01:03 +0000
Hey Ribbotech,

If the software to be used with the CNC is not known at the moment, would it be ok if the design is made it Solidworks?

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