Asymptotic conditions is reached, when for a fluid flowing in laminar flow through a long tube___________________?
Correct answer: C. Exit fluid temperature = wall temperature
- A. Exit-fluid temperature > wall temperature
- B. Exit fluid temperature < wall temperature
- C. Exit fluid temperature = wall temperature
- D. Graetz number > 100
Explanation
In the asymptotic condition, the fluid temperature approaches the constant wall temperature as the tube length becomes very large. Thus, at the limiting condition, the exit-fluid temperature equals the wall temperature.
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