Solving the Energy Balance Problem

[tonyjk]

Hello,
I was reading an article, and I found something unfamiliar(sorry I am not into heat transfer a lot) :

For the energy balance of the fluid, I didn't understand the mC_pθ where θ is the temperature and mC_p(θ+dθ/dx θ) terms. I know that for a control volume, the energy balance for incompressible steady flow etc.. ΔH = Q = mC_pΔθ. I know here we will have the same result at the end but the idea of taking these two terms as heat flux confused me.

Thank you

 

[Chestermiller]

Hello,
I was reading an article, and I found something unfamiliar(sorry I am not into heat transfer a lot) :

For the energy balance of the fluid, I didn't understand the mC_pθ where θ is the temperature and mC_p(θ+dθ/dx θ) terms. I know that for a control volume, the energy balance for incompressible steady flow etc.. ΔH = Q = mC_pΔθ. I know here we will have the same result at the end but the idea of taking these two terms as heat flux confused me.

Thank you

I can see what they are doing, but I don't like it being done this way either.

Chet