Yg. Chesnokov, HEAT OR MASS-EXCHANGE IN THE INITIAL SECTION OF A ROUND PIPE AT VARIABLE WALL TEMPERATURE OR CONCENTRATION AT THE WALL, Russian journal of applied chemistry, 70(1), 1997, pp. 116-119
The formulas for the calculation of local and average over the pipe le
ngth Nusselt numbers, valid for variable wall temperature or concentra
tion at the wall, are obtained.