Surface temperature profile of a forced convection in circular tube

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SUMMARY

The forum discussion centers on an experiment involving forced convection in a circular tube with a constant heat flux. The user observed an unexpected surface temperature profile, where the temperature initially increased and then decreased towards the outlet. This anomaly is attributed to potential exit and entrance effects, as well as the unsealed outlet impacting the Reynolds number (Re) and heat flux distribution. The experiment was conducted in a 2-meter long tube, highlighting the importance of understanding flow development in thermal analysis.

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MechaMZ
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Hi,

I've did an experiment today, a forced convection in circular tube where the heat flux is constant along the length.

my result seems not follow what it should be..

[PLAIN]http://img688.imageshack.us/img688/8015/expresult.png

what I'm wondering is shouldn't it in a fully developed region, the surface temperature Ts will also increase linearly in the flow direction. but why my surface temperature at the left hand side is increasing until certain point then decreasing along the way to the outlet?

am i right to say because the outlet is not sealed? so it affect the Re and then disturb the heat flux? please correct my assumption if it is wrong.
 
Last edited by a moderator:
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exit and entrance effects?
 
how long is the pipe and how is the heat being applied?
 
it is about 2 meter in length
 

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