Does friction play a role in Fanno flow?

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In Fanno flow, there is no change in total enthalpy (h0) due to the absence of heat transfer and shaft work. Friction affects the fluid by slowing it down at the wall, converting kinetic energy into internal energy, which leads to a drop in dynamic temperature while static temperature increases. Despite these changes, the total temperature and total enthalpy remain constant. Friction does not perform work in this context, confirming that h0 stays the same. Overall, friction influences temperature distribution but does not alter the total energy balance in Fanno flow.
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For Fanno flow, there is no change in h0 since no heat transfer and shaft work. I am wondering whether friction does work or not. Could anyone help me out? Thanks.
 
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Friction will result in slowing down the fluid at the wall, thus converting kinetic energy into internal. So the dynamic temperature v^2/2cp will drop, but the static temperature will rise. The total temperature and the total enthalpy remain the same.

Hope this helps! :smile:
 
In this way you see that h0 remains the same, no work is spent or added. The friction force does not do work.
 

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