Convective Heat - ASTM C680

[lukman1]

Hi All,

I was going through the ASTM C680 for a calculation of convective heat transfer coefficient. My particular application presently is cylindrical (pipe). However there is this concern of the direction of fluid flow.

I am wondering if somebody knows on which premise the formulars were developed in terms of fluid flow (I mean is the fluid flowing in the pipe axially or outside of the pipe normally to the pipe).

Thanks.

 

[BigInch]

I don't have the spec, but I would think it just might be Flowing inside the pipe... and axially.

http://virtualpipeline.spaces.msn.com

"What gets us into trouble is not what we don't know, its what we know for sure" - Mark Twain

 

[C2it]

Para 5.3 states that ASTM A680 can be used for ".... heat flows normal to flat surfaces ... for boilers etc ... and in cylindrical coordinates can be used for radial heat flows for all types of piping circuits."

I think that heat from normal flow outside, provided the pipe is fully immersed is no different to heat from inside. Just reverse the equations.