Asymptotic conditions is reached, when for a fluid flowing in laminar flow through a long tube

Question: Asymptotic conditions is reached, when for a fluid flowing in laminar flow through a long tube
[A].

exit-fluid temperature > wall temperature.

[B].

exit fluid temperature < wall temperature.

[C].

exit fluid temperature = wall temperature.

[D].

Graetz number > 100.

Answer: Option C

Explanation:

No answer description available for this question.