Heat transfer for turbulent flow of helium or hydrogen in a tube at high temperatures: Evaluation with the method of Petukhov

Experimental heat transfer data for the turbulent flow of helium or hydrogen in circular tubes at very high wall temperatures (up to 2800 C) were reevaluated with the method of Petukhov. Data for tests with nonconstant heat flux distribution along the tube were corrected with the superposition method. The Petukhov correlation method does not account completely for the increase of the heat transfer coefficient in the entrance region of the tube. However, for the downstream region the correlation is successful. The 1624 reevaluated experimental points are correlated with a standard deviation of 7.0 % for l/d between 2 and 316, where l = distance from the inlet of the section considered (the unheated entrance length not included) and d = inner diameter of the tube.