Surface temperature profile of a forced convection in circular tube

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Homework Help Overview

The discussion revolves around an experiment involving forced convection in a circular tube with a constant heat flux. The original poster expresses confusion regarding the surface temperature profile observed in their results, particularly questioning the expected linear increase in temperature in the fully developed region.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • The original poster questions the relationship between the surface temperature profile and the outlet conditions, suggesting that the unsealed outlet may affect the Reynolds number and heat flux. Other participants inquire about the effects of entrance and exit conditions, as well as specifics regarding the length of the pipe and the method of heat application.

Discussion Status

The discussion is ongoing, with participants exploring various factors that may influence the observed results. There is no explicit consensus yet, but several lines of inquiry are being pursued regarding the experimental setup and its implications.

Contextual Notes

The original poster notes that the pipe is approximately 2 meters in length, which may be relevant to the discussion of flow characteristics and temperature profiles.

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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