Thank You Mohammed for your response. I am aware of the meaning of velocity gradient. The question is why 800-1000/sec is suggested as  normal ?what is the impact if tV.G is considered as 500 or 1500 ?

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Thank You Mohammed for your response.

I am aware of the meaning of velocity gradient. The question is why 800-1000/sec is suggested as  normal ?what is the impact if tV.G is considered as 500 or 1500 ?