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 Heat distribution in a rocket stove

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jameshookway

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PostSubject: Heat distribution in a rocket stove   Fri Jan 03, 2014 10:31 pm

Here is a computer model of the heat distribution in a rocket stove. This was modelled by the students at Sheffield University Engineering department.
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aravaron



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PostSubject: Re: Heat distribution in a rocket stove   Sat Jan 04, 2014 2:09 am

wow! so it means that all the heat concentrate in the corner of the elbow! i thought its in the middle
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jameshookway

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PostSubject: Re: Heat distribution in a rocket stove   Sat Jan 04, 2014 4:05 am



Here is a horizontal RS with fins to create a vortex. This time the colours represent air flow rather than heat.This shows how the heat is pushed to the outside therefore more heat is transferred out of the RS walls.



In this diagram the temperatures were measured when the RS was wrapped in insulation.

Again thanks to the students at Sheffield University
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Mr. Heater

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PostSubject: Re: Heat distribution in a rocket stove   Sun Jan 19, 2014 1:18 pm

Great information James !

Would you have any more detail on the fins being used in the horizontal RS ? Such as # of fins, angles to each other, distance from the source ? The fins in the picture are difficult to distinguish.

Thanks !
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jameshookway

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PostSubject: Re: Heat distribution in a rocket stove   Sun Jan 19, 2014 8:36 pm

Hi Mr Heater,

Here is the link to the project I did with the students at sheffield University. If this does not answer the questions please get back to me.

James

http://www.scribd.com/doc/158281191/Hookway-Charcoal-Retort-Development
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Mr. Heater

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PostSubject: Re: Heat distribution in a rocket stove   Sun Jan 19, 2014 9:22 pm

Hi James,

Thanks for the link. Interesting comparison study of the different designs. Design #6 is the one that interests me. Unfortunately the sketch does not have any details about the fins used to create the turbulence in the horizontal pipe.

The reason that I am interested in the design is I would like to apply the principle to a horizontal pipe buried in a gravel floor to heat a greenhouse. Even heat distribution in the pipe would ensure uniform heat distribution rather than being too hot on the heat source end, and too cold on the exhaust end.

I am very interested in the design details used to achieve the uniform heat distribution.

Thanks for your help.

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gadily
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PostSubject: Re: Heat distribution in a rocket stove   Sun Jan 19, 2014 11:07 pm

there is details within figure 17 of the pdf for fins
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Mr. Heater

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PostSubject: Re: Heat distribution in a rocket stove   Mon Jan 20, 2014 12:27 am

Hi Gadily,

Unfortunately I am not a Scribed member, and access to the PDF would encounter paying for it.

Could you cut and paste the figure in the thread ?  It would be much appreciated.     :)
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jameshookway

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PostSubject: Re: Heat distribution in a rocket stove   Mon Jan 20, 2014 3:31 am

Hi Mr Heater

Here is the photo of them.



The difference between them is only slight. The one on the right the two sides overlap, but the left side worked well

James
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Mr. Heater

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PostSubject: Re: Heat distribution in a rocket stove   Mon Jan 20, 2014 3:44 am

Thanks James ! Simple, yet very effective.
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jameshookway

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PostSubject: Re: Heat distribution in a rocket stove   Mon Jan 20, 2014 3:53 am

I forgot to say that I make them out of stainless as these fins only lasted two firings. Also weld them in position as they will move.
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Mr. Heater

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PostSubject: Re: Heat distribution in a rocket stove   Mon Jan 20, 2014 4:40 am

OK stainless is a good idea. Yes, they are going to take a lot of heat.

It appears that the tip ends are slightly curled (opposite ?) to each other in the photo on the right. (one bend up, and one bend down) kind of like a fan blade or propeller.
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jameshookway

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PostSubject: Re: Heat distribution in a rocket stove   Mon Jan 20, 2014 4:49 am

Yes the one on the left has been, but it did not seam to make much difference. More work on this may be a good idea.
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caotropheus
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PostSubject: Re: Heat distribution in a rocket stove   Mon Jan 20, 2014 5:06 am

James,

Very nice report. Interesting that we used the same idea to create the turbulator (I call them vortex fins). If we are creating a vortex inside the stove tubing, is it a form of turbulence?
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jameshookway

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PostSubject: Re: Heat distribution in a rocket stove   Mon Jan 20, 2014 5:13 am

The students called it a turbulator. I liked the name it sounds like good terminology. I put mine at a 45 degree angle to the pipe. How did you set yours up?
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caotropheus
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PostSubject: Re: Heat distribution in a rocket stove   Mon Jan 20, 2014 5:16 am



45 degrees as well, each fin 90 degrees one in relation to each other. You can see it at minute 2:00
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jameshookway

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PostSubject: Re: Heat distribution in a rocket stove   Mon Jan 20, 2014 5:26 am

Do you think changing the angle will make any difference?
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caotropheus
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PostSubject: Re: Heat distribution in a rocket stove   Mon Jan 20, 2014 5:32 am

Indeed it will, the member aravaron made vortex fin like these ones, but instead of placing them 90 degrees one in relation to the other, he placed them at 45 degrees and it choked the fire. We also attach the fins one in relation to the other by the middle of the longest axis. We could test the influence on the vortex if for example the fins are not attached to each other by the middle of the longest axle.


Last edited by caotropheus on Mon Jan 20, 2014 2:44 pm; edited 1 time in total
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jameshookway

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PostSubject: Re: Heat distribution in a rocket stove   Mon Jan 20, 2014 5:45 am

i have seen fins attached to the sides and they did not work.

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Mr. Heater

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PostSubject: Re: Heat distribution in a rocket stove   Thu Jan 23, 2014 7:33 am

I think that a standard earth auger bit inserted inside the tube would be a good way to distribute the heat on a vertical or horizontal run.  It could be easily inserted into the pipe.  It would be interesting to see a model of the heat distribution using an internal spiral.

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jameshookway

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PostSubject: Re: Heat distribution in a rocket stove   Thu Jan 23, 2014 9:03 am

I Like your thinking Mr Heater. :) How much are augers?
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gadily
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PostSubject: Re: Heat distribution in a rocket stove   Thu Jan 23, 2014 9:25 am

very dear to buy as ive checked was considering using them for pellet feeder from box but the motor is dear to buy as well

one thing thoe did any of you guys try the approach of using maths in degrees to create the vortex going into the pipe than using the method of placing a differentual plates in creating the vortex?

as by my maths for a 4" tube the degree in throwing it into the vortex tube is about 23-25 degrees so it misses the opening of the hole rising above the tube in a vortex

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PostSubject: Re: Heat distribution in a rocket stove   Thu Jan 23, 2014 11:16 am

jameshookway wrote:
I Like your thinking Mr Heater. :) How much are augers?

James, here is a web site that may be helpful if your looking for more info on auger flighting?

Just a thought, maybe the flighting without the tube ?  Idea 

http://www.rfsaugerflighting.com/
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caotropheus
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PostSubject: Re: Heat distribution in a rocket stove   Thu Jan 23, 2014 3:01 pm

One situation I may see with augers is that they are heavy!
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PostSubject: Re: Heat distribution in a rocket stove   Thu Jan 23, 2014 4:52 pm

caotropheus wrote:
One situation I may see with augers is that they are heavy!

That was the first thing that came to mind when I seen Mr Heaters earth Auger idea. Idea 

I have worked with many different types of auger flighting  for various types of applications. I thought the wed site link might be helpfuling, Very Happy  Just make sure you are sitting down when you go to price the stuff !  :affraid:
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