Lamina flow - test tube problem

Discussion on Stirling or "hot air" engines (all types)
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Boki
Posts: 3
Joined: Sun Feb 07, 2016 2:55 am

Lamina flow - test tube problem

Post by Boki » Thu Oct 13, 2016 9:57 pm

Hi,

I have built a nice little lamina flow engine and it runs on alcohol burner. The problem is where the flame heats the test tube and it seems, that test tube gets soft and deformed at that spot. I use borosilicate test tubes and i am asking, if there is a better type of test tubes with better glass to be used for my engine, so that the glass stays undeformed. If there are any other solutions, please let me know.
Thank you, Boki

Ian S C
Posts: 2221
Joined: Thu Dec 02, 2010 5:15 am
Location: New Zealand

Re: Lamina flow - test tube problem

Post by Ian S C » Sat Oct 15, 2016 1:29 am

Boki, is it possible to use a smaller flame, use the smallest flame that the engine will run with, this will delay the break down of the test tube. Sorry can't help with sourcing more suitable test tubes.
Ian S C

Alexandr
Posts: 5
Joined: Tue Oct 04, 2016 4:58 am

Re: Lamina flow - test tube problem

Post by Alexandr » Sat Oct 15, 2016 11:27 pm

The tube of quartz glass. It is used in electric heaters UFO. The melting point of more than 2000.

Ian S C
Posts: 2221
Joined: Thu Dec 02, 2010 5:15 am
Location: New Zealand

Re: Lamina flow - test tube problem

Post by Ian S C » Mon Oct 17, 2016 1:00 am

But can you get test tubes made of quartz glass? The borosilicate tubes are the normally used ones.
Ian S C

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