ASVAB is a pretty long and comprehensive test, comprising nine sections in total. Some sections contain general questions, while some more specialized ones. That is why it is necessary to study a wide range of materials (online and offline), so as to have enough knowledge to complete the test.
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then smooth boundary >100.Roughness in the term of reynolds number Instead of value of is used to classify the type of boundary and limits for these type of flow is <4. then rough boundary . Laminar Flow in a Pipe The behavior of flow in pipes is determined by the Reynolds number Re. .Criterion for Turbulent vs. Flow tends to become turbulent when Re > 3000. the behavior is unpredictable and often switches back and forth between laminar and turbulent.