Talk:Internally rifled boiler tubes

Expansion
I have tried adding material for now which I could find. However I will appreciate a discussion and participate with full enthu on this article if anyone sound in this subject is willing to expand it. A team of two is also enough for a beginner. Ghorpaapi (talk) 09:03, 12 April 2013 (UTC)


 * A couple of things I can see that need expansion:
 * Images. These things are hard to explain without a picture.
 * Internal fins / external fins / corrugations / spirals. There have been several attempts to increase surface area and to improve heat transfer (not always simply by increasing the surface). Is this article covering all of them (I would suggest so), or is it going to limit itself narrowly to just Serve's approach?  Other tubes, like the Spanner 'Swirlyflo' could usefully be explained here. A rename might eventually be useful.
 * Fire-, water- or both sorts of tube?
 * Andy Dingley (talk) 09:38, 12 April 2013 (UTC)


 * Pictures seems a good idea I am going to make some myself in Autocadd and upload them. Nextly The different types of tubes looks a good idea to me.
 * I have recently got a book Heat Exchangers and Condenser Tubes Tube types and material attributes are explained in detail in this book and hence forth it will also be easy to quote them . ISBN 3-934736-08-4 Edited by Prof Dr Ing Jovan Mitrovic under PUBLICO PUBLICATIONS 2004.
 * Actually Serve used it for fire tube but in the modern day powerplant industry it is used extensively in water tube boilers, heat exchangers and air preheaters as well.
 * Final comments from my side 1)renaming seems to be appropriate with the titel Classification of Tubes ?? or what would you suggest ? 2)Tagging the article so that more contributors could check it and correct it, nextly it could be included in different Wiki projects along with a tag of under construction on this article page . Ghorpaapi (talk) 10:15, 12 April 2013 (UTC)

Marketing overload
This is really not an engineering development, there have been schemes to increase the heat transfer surface area of tubes for more than a century. Rifled tubing is a generic standard option for refrigeration heat exchangers for example. The trade-off is always the modest change in performance vs tube life under dynamic operating conditions vs additional cost. The cost increment is low for extruded and welded tube. I’m not sure someone would really consider this for the tubing in a nuclear reactor. The minimum tube wall thickness is non-negotiable, so internal rifling would project entirely inward increasing flow resistance. I tend to suspect that the functional feature of a rifling pattern would be a pattern that breaks up the laminar flow improving the boundary layer limited thermal transfer coefficient under forced circulation. Iirc the critical deign constraint in a BWR is boundary layer plugging in the heat exchanger when the forced circulation has failed and the tubes end up being much much larger than is desirable operating with forced circulation and that means rifling them would be a useless flourish, the surface to volume ratio will still stink and the rifling won’t cause enough turbulence to reach most of the flowing mass. OTOH if someone is designing a BWR with smaller diameter heat exchanger tubes that would benefit from rifling then the fail-safe strategy probably includes an escape route and numbered bank accounts. PolychromePlatypus (talk) 20:41, 29 April 2022 (UTC)