Heat Flux

[LossPEngg]

Hi All,

Would any one kmow if it is possible to find out how much temperature it is in Kelvin if one knows the heat flux from a flame.
I am modelling the heat effects on a pipeline wall following an ignited leak (the temperature effect on the wall under the cone shapes flame). I have equations with which I can determine the heat flux from the flame and the radiation but I need the temperature in Kelvin for my model to predict the thermal stresses.
Any suggestions?

Warm regards.

 

[Yorkman]

Convert degrees F to degrees C add 273 is how I would do it, or maybe I'm not understanding the question, or units for heat flux.

I'm not a real engineer, but I play one on T.V.
A.J. Gest, York Int./JCI

 

[JKEngineer]

Pipefire -
It sounds like you have some circular reasoning going on. I base that on: if you know the radiation and the flux, then you can back calculate the flame T, but you are looking for the T -- so I think you don't have as much information as you present.

How much actual field data do you have? You might be able to actually measure the flame T. You might be able to use the pipe surface temperatures to calculate the stresses by imposing the temperatures into an FEA model without doing the heat transfer.

As another approach, if you have some of the pipe temperature data you can run heat transfer calcs to iteratively get the flame temperature by trial and error. Run your simulation iteratively using various flame T's until it matches the surface T data. Then use that number to run the full heat transfer and subsequently the stress calculations.

Jack

Jack M. Kleinfeld, P.E. Kleinfeld Technical Services, Inc.
Infrared Thermography, Finite Element Analysis, Process Engineering

http://www.KleinfeldTechnical.com