Gas temperature drop along SS tubing

[cjw]

kindly request engineering calculations on how to calculate the temperature drop of gas at 900 deg C at the sample point, flowing at 100 l/h, pressure in the line approx. 2700 kPag. Line material is 316 SS, wall thickness approx. 2mm, and the total length = 3 meters.

 

[TD2K]

Calculate the inside and outside heat transfer coefficients (see your heat transfer books). Calculate the effective overall heat transfer coefficient and using that, solve for the heat loss and therefore the temperature drop of the gas.

But my guess is over 3m, the cooling isn't going to be much.

 

[hacksaw]

You left out the tubing i.d. This determines the surface area and the fluid velocity...

As a rule, gas sampling is done in stages, are you trying to cool the entire sample to a definite temperature or just a portion?

 

[pmover]

i would think that at 900°C, even though only 3 m length, that personnel/equipment/surrounding environment protection may be required. but then again, insulation may not be suitable until the analysis is completed.
have fun!
-pmover