I have double pipe heat exchanger and I want to calculate numerically the local temperature reference that used for calculation heat transfer coefficient locally .If the heat flux is constant are known and all properties is known too.I want to compare with experimental work .The temperature will change as mesh change and cannot be used for comparison with experimental work . This mean can not be calculated where Tref=f(y).
you know h=q/(Tw-Tref) where q heat flux.
must I calculate h or Tref manually with another assumptions?
In compact heat exchanger, when the heat transfer coefficient is needed locally, and we have numerical results we can determine the temperature difference between the wall, and the bulk temperature above it. The bulk temperature is obtained considering the mixing cup of fluid in each section. The bulk temperature could be obtained as a function of length and a polinomial curve can be fitted for the heat exchanger. It's a additional work but the results are goods at least in my case.
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