Talk:Magnetohydrodynamic generator

message: I have a question to those who are really proficient in MHD generation.
There exist some claims that degree of interaction between flowing molecules (gases) and ions on one hand and flowing molecules (gases) and electrons on other hand is vastly different. Therefore movement of ions in a gas flow will occur much faster than movement of free electrons. If this is correct then why we need to use a strong magnets to separate ions and electrons in MHD generator? If speed of the ions and electrons movement in the same gas flow is vastly different then doesn't charge separation suppose to occur by itself just due to a gas flow? Shouldn't majority of electrons concentrate at the beginning of the duct while many more ions at the end? Then only thing we need to generate current is to put an electrode at the beginning of the duct and another one at the end and let electrons flow from the inside of the duct through the external load to the end of the duct and recombine with ions there? And no need for a magnets.   — Preceding unsigned comment added by 192.222.146.79 (talk) 10:45, 2 March 2020 (UTC)
thread_title:  Are magnets really needed? 

message: * Done:wikilink elements and pivotal words in sentences
* Done:unify terminology of 'tube' 'pipe' 'channel' 'cylinder' (I used the terminology of the Messerle reference).
* have others help with grammar and wording ...
* Done: look for an 'efficiency' for throughput for coal power plants (from amount of energy in fuel to amount of electricity produced from same fuel) (USed the Messerle reference)
* efficency of nuclear power plants from amount of fuel consumed to amount of energy produced.
* Done, sort of...: do the math to verify efficency of MHD generator ... 10 to 20% came from the babelfish german version and needs to be verified. (I didn't do the math, I shamelessly imported Messerle's results, whcih were from actual experiments).
* (Oops; I'll try to add it) please check: power generation example lacks any mention of a magnetic field, isn't this required?
: Comments by Ray Van De Walker 19:34, 19 March 2007 (UTC)
thread_title:  todo 

message: I can't find any current examples of MHD generators in use for production of electric power. It's my impression that this ship has sailed...that the steady development of, eg. combined-cycle gas turbines with steam bottoming cycles have gained all the efficiency advantages that were once  supposed for MHD, without the heart-breaking difficulty of trying to make a gas conduct electricity.  Can anyone point at an MHD experiment more recent than the early '70s, which is all my "Standard Handbook for Electrical Engineers" has ?  --Wtshymanski 01:50, 21 May 2005 (UTC)
replies: text: Being an enthusiast, I had a more recent reference work, the Messerle reference.  I wrote the more recent history from that.  I hope it's helpful.  I bought Messerle some time ago, and I was surprised to find that it is not available at either A Libris or Amazon.  However, many research libraries have copies, because many subscribed to the UNESCO energy series. Ray Van De Walker 19:38, 19 March 2007 (UTC)
thread_title:  Current developments?

message: I was surprised to find no mention of the different generator types, so I added that information.  The Faraday generator has been obsolete for more than forty years.  I believe the AVCO Mk. V (1965) was a Hall generator. Ray Van De Walker 19:41, 19 March 2007 (UTC)
thread_title:  generator types? 

message: I was looking into why the magnetic field strength was stated to increase with the 7th power of the distance, and while I didn't exactly find a citeable source, I did come across this tidbit:
It would seem that since the electromagnetic field in the fluid is induced by the coils, the strength would indeed depend on the field strength produced by the coils, and would be subject to the same strength increase/decrease due to distance as normal magnets on top of that.
So this would result in (1/x^3)*(1/x^4)=1/x^7.
-- AfroThundr3007730 (talk) 03:51, 28 May 2015 (UTC)
thread_title: Magnetic Field Strength (no citation)

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