Attached is the pipe in an IGES format. The parameters are:
Tube temperature: 85C
Forced air temperature: 23C
Target pipe temperature: 25C
Time to cool: TBD
Air flow inside pipe: 700CFM...
WOW! I never expected so much activity for this post. At this point there are 27 replies to my original question.
zekeman, you were right with the comment "The OP probably needs a conservative time it takes to cool the surface.." That is really what I was looking for.
I am not an engineer...
Spare time!! Whats that?
Unfortunately, I work for an automotive supplier and cannot really give out the 3d data.
I really just want to "ballpark" the cooling time required to achieve a given temperature. The equation ione gave got me close, i just need an approximate "h" value.
Until I get...
The only part I am having trouble with is determining h. I understand that as a general rule for natural convection, h=10. Not sure what to use for forced air convection though. I would be using a fan moving 725 cfm. Any thoughts?
I am looking for a formula to determine the cooling time of a blow-molded plastic tube with forced cold air. The pipe is 40mm o.d. with a 3-4mm wall thickness. I appreciate any help offered. Thanks in advance!
