Which of the following flows have the highest critical Reynolds number (lower)?

Which of the following flows have the highest critical Reynolds number (lower)? Correct Answer Flow in a pipe

The approximate lower critical Reynolds number for Flow in a pipe, flow between parallel plates, flow in an open channel and flow around the spherical body are 2000, 1000, 500 and 1 respectively. Hence, the maximum is for internal pipe flow.
Bissoy MCQ

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