circular tubes for heat transfer in boiler
circular tubes for heat transfer in boiler
(OP)
Dear Sir
I have question in mind that why circular tubes used and not square or rectangular tubes for heat tranfer in boilers? Instead of no of circular tubes why no no of square or rectangular tubes for this purpose/
Regards
Pradeep
I have question in mind that why circular tubes used and not square or rectangular tubes for heat tranfer in boilers? Instead of no of circular tubes why no no of square or rectangular tubes for this purpose/
Regards
Pradeep





RE: circular tubes for heat transfer in boiler
Still, they might give better heat transfer in some configurations, i.e., if they can induce some extra turbulence on the shell side.
But the most likely answer is that there's no simple way to terminate the ends of square/rectangular tubes to a tubesheet.
You could use square tubes that are formed with round ends and terminate them in the usual way, but that leaves no way to replace individual tubes, e.g., pulling a square tube through a round hole.
Note that obround tubes are used extensively in automobile radiators, but they are never individually replaced, and are assembled with external fins, for which the flattened sides are a great advantage in conducting heat from the tube wall to the fin material.
Mike Halloran
Pembroke Pines, FL, USA
RE: circular tubes for heat transfer in boiler
Regards
RE: circular tubes for heat transfer in boiler
Mike Halloran
Pembroke Pines, FL, USA
RE: circular tubes for heat transfer in boiler
RE: circular tubes for heat transfer in boiler
Oblong tubes are used in air cooled condensers installed in freezing climates, since they can survive several ice freezing events without cracking. Their design pressure is only +- 1 atm, so wall thickness is not an issue.
Oblong tubes also have minimal frictional pressure drop for the outside flowing flue gas if the major axis is parallel to the fluegas direction ( eg Joukowski airfoil) but this also means low convective heat transfer coefficient- to offset that penalty, extended fins are added.
"...when logic, and proportion, have fallen, sloppy dead..." Grace Slick
RE: circular tubes for heat transfer in boiler
I am not talking about advantage or disadvantage of using square or other non circular shape. I am just asking for curiosity that any specific reason for circular tubes
Regards
Pradeep
RE: circular tubes for heat transfer in boiler
Your question was answered several times. If there's no benefit, then there is no engineering reason for choosing them, particularly since they are hard to make and harder to form.
TTFN (ta ta for now)
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RE: circular tubes for heat transfer in boiler
RE: circular tubes for heat transfer in boiler
Why u sent Yutube video and Forum policies? I also know that my question answered but with every new answer new information I came to know. Is'nt good that every one get to know new information.
RE: circular tubes for heat transfer in boiler
TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers Entire Forum list http://www.eng-tips.com/forumlist.cfm