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Which of the following statements is correct? | |
A. | Lower critical Reynolds number is of no practical significance in pipe flow problems. [Correct Answer] |
B. | Upper critical Reynolds number is significant in pipe flow problems. [Wrong Answer] |
C. | Lower critical Reynolds number has the value 2000 in pipe flow [Wrong Answer] |
D. | Upper critical Reynolds number is the number at which turbulent flow changes to laminar flow. [Wrong Answer] |