tubes - vortexes - second mode
tubes - vortexes - second mode
(OP)
One of our groups routinely analyzes vortex shedding frequencies of boiler tubes. I hear we are real concerned that they not match standing wave frequencies within the enclosure. Recently I was asked if I'd expect vortices could significantly excite the tubes "second mode" if frequencies are close. I'm checking to see if the "second mode" is really an S shape, and not another lateral mode )). I am not sure about the proximity of other tubes
My guess is things probably could get locked together, but I have no experience or references that offer anything useful.
Any suggestions?
thanks
Dan T
My guess is things probably could get locked together, but I have no experience or references that offer anything useful.
Any suggestions?
thanks
Dan T





RE: tubes - vortexes - second mode
RE: tubes - vortexes - second mode
Fe
RE: tubes - vortexes - second mode
I see no reason why vortices couldn't excite higher modes, though I don't think an S shape is the second mode of an open tube.
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: tubes - vortexes - second mode
and the 2nd mode is likely to be 'more damped' so the amplitude of oscillation would be less noticeable.
Of course, this is system specific, some systems are not like this.
I would worry more about the 1st mode
Fe
RE: tubes - vortexes - second mode
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: tubes - vortexes - second mode
I guess it is all dependent on the OP's system.
Fe