Question

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Which of the following plots illustrates the change in pipe surface temperature as a function of pipe length x for a pipe subjected to a uniform positive heat flux? A)TS B)TS X X C) T1 D)T, 1 х х E) Tsh F) T. Х Х

Answer 1

since: qs : :constant. given. Sinc asa dTs dx is dis constant dx so we can write Ts=ke+ c (K, C are constant ), • But this relation is valid for fully developed frow only, • In the entrance region due to turbulent mixing the higher and will rate of change of Ts with x will be gradually decrease f then becomes constant as depicted following figure. Entrance region Fully developed region 1 TSIA } so; (E) is correct.